My experiences with 1.4 petrol engine overheating problems and solutions. - 206

< defer="" ="https://static.cloudflareinsights.com/beacon.min.js/v67327c56f0bb4ef8b305cae61679db8f1769101564043" integrity="sha512-rdcWY47ByXd76cbCFzznIcEaCN71jqkWBBqlwhF1SY7KubdLKZiEGeP7AyieKZlGP9hbY/MhGrwXzJC/HulNyg==" -cf-beacon=""version":"2024.11.0","token":"11ac6a036a5c4b83a3c20a30a3bc3ba2","r":1,"_timing":"name":"cfCacheStatus":true,"cfEdge":true,"cfExtPri":true,"cfL4":true,"cfOrigin":true,"cfSpeedBrain":true,"location_startswith":null" crossorigin="anonymous">Hello everyone, I'm new to the site. Please forgive any mistakes I might make. I intend to share my experience with my car and offer a solution to the problem. My car is a 1999 model 206 1.4 xr 5K (TU3 JP) engine. When I first acquired the car, it frequently had overheating problems. My wife's sister used to drive the car, and she's a terrible driver. When she first bought it, I told her it had been sitting idle for a long time and had been worn down by an inexperienced mechanic. It had a Çorum license plate. After I started using it, I dealt with many problems. Now, to the main point. First, they said the reserve tank cap was leaking, so I replaced it. The reserve tank outlet was crushed and leaking. I gently heated it without burning it and used a pipe to straighten it to the correct diameter and levelness. There have been no problems since then. I would remove the summer sensor the mechanic installed and put the old one back in during the winter. I would disable the thermostat in the summer. The fan would spin at a single speed and high. Naturally, we eventually burned out the fan. I opened the radiator and used small pieces of cloth and an LED fluorescent tube to clean the inside. I made a mistake while putting the radiator cap back on; it was leaking drop by drop, and when it got worse, I replaced it. When the engine was cold, I removed the radiator and its connections and cleaned the dirt inside the engine from the reserve tank using a garden hose. Unexpected dirt and other things came out of the engine. And I repeated this cleaning 3 or 4 times, until the water in the engine was completely clear. The radiator was changed. I unknowingly put in red antifreeze. They said red antifreeze is for newer generation vehicles. I cleaned it again from scratch and changed the antifreeze. When I pushed it hard, especially going uphill, the temperature would rise immediately. The car had no power. The mechanics said, "This is a 1.4 engine, don't expect much." When going 70-80 km/h, it would accelerate on its own without a hitch. At 120 km/h, if I encountered a slight incline, it would drop to 50 km/h. I changed the coils and spark plugs, it didn't work; they adjusted the valves, it didn't work. I said the car was running like a 3.5-cylinder engine, and the mechanics laughed. Sometimes it would be a beast, but the engine was always sluggish. I couldn't climb steep hills and would have to turn back. I changed the timing belt and water pump myself. By the way, I had the timing belt changed twice in 3 years, and it hadn't changed anything. I decided to do it myself. I think the sluggishness in the engine was due to this. The timing belt had stripped 3-4 teeth. I adjusted it myself and installed the belt. I adjusted the valves myself after learning the adjustments from the website. I even held a lighter upright on the running engine; it didn't drop. The engine's operation improved. The engine started running smoothly. I opened and cleaned the throttle body, ensuring the airflow passes through the idle hole so that the throttle body closes completely. The RPM was between 1000 and 1200; now it's around 1000, and around 900 when it's warm. During the work, I started researching and understanding the cooling system. I heard about a FAN RESISTOR for the first time. Apparently, it allows the fan to run at 2 speeds. I immediately bought one. But it didn't have the wiring. I designed and implemented my own wiring. I will share the drawings. I bought two 80 amp or higher amperage RELAYS. My radiator is a Kale brand and its sensor inlet is M22x1.5 thread. The sensor is single-stage... I thought it wouldn't work in this case. I saw sensors that opened at different temperatures, but the one on it wasn't original and opened at the wrong temperatures. It should be in the 92-97 range. I needed a two-stage sensor. While researching, the sensor (FAE 37910) from Palio, Siena, Tempra, etc. vehicles fit. Both the teeth and the opening/closing are very good. The first stage will open at 92°, stop at 87°, and the second stage will open at 97°, stop at 92°. It will do slow revs in the first stage and fast revs in the second. I got quite good performance this way. There are thermostats that open at 98°, but I bought one that opens at 89°. (VALEO 820434 Thermostat 1336Q1) The engine will heat up to 89° and the water in the engine will circulate when it reaches 90°. When the water temperature coming from the motor reaches 92 degrees, the sensor will activate the first-stage fan and gradually start cooling until it reaches 87 degrees. If the water coming from the motor is too hot, the sensor will activate at 97 degrees and cool at a high speed in the second stage. In short, if there is no problem with the motor and the cooling components, the system works very well, thank God. Here is my fan wiring diagram.

< defer="" ="https://static.cloudflareinsights.com/beacon.min.js/v67327c56f0bb4ef8b305cae61679db8f1769101564043" integrity="sha512-rdcWY47ByXd76cbCFzznIcEaCN71jqkWBBqlwhF1SY7KubdLKZiEGeP7AyieKZlGP9hbY/MhGrwXzJC/HulNyg==" -cf-beacon=""version":"2024.11.0","token":"11ac6a036a5c4b83a3c20a30a3bc3ba2","r":1,"_timing":"name":"cfCacheStatus":true,"cfEdge":true,"cfExtPri":true,"cfL4":true,"cfOrigin":true,"cfSpeedBrain":true,"location_startswith":null" crossorigin="anonymous"> Hello everyone, I'm new to the site. Please forgive any mistakes I might make. I intend to share my experience with my car and offer a solution. My car is a 1999 model 206 1.4 xr 5K (TU3 JP) engine. When I first acquired the car, it frequently had overheating problems. My wife's sister used to drive the car, and she's a terrible driver. When she first bought it, I told her it had been sitting idle for a long time and had been worn down by an inexperienced mechanic. It had a Çorum license plate. After I started using it, I dealt with many problems. Now, to the main point. First, they said the reserve tank cap was leaking, so I replaced it. The reserve tank outlet was crushed and leaking. I gently heated it without burning it and used a pipe to straighten it to the correct diameter and levelness. There have been no problems since then. I would remove the summer sensor the mechanic installed and put the old one back in during the winter. I would disable the thermostat in the summer. The fan would spin at a single speed and high. Naturally, we eventually burned out the fan. I opened the radiator and used small pieces of cloth and an LED fluorescent tube to clean the inside. I made a mistake while putting the radiator cap back on; it was leaking drop by drop, and when it got worse, I replaced it. When the engine was cold, I removed the radiator and its connections and cleaned the dirt inside the engine from the reserve tank using a garden hose. Unexpected dirt and other things came out of the engine. And I repeated this cleaning 3 or 4 times, until the water in the engine was completely clear. The radiator was changed. I unknowingly put in red antifreeze. They said red antifreeze is for newer generation vehicles. I cleaned it again from scratch and changed the antifreeze. When I pushed it hard, especially going uphill, the temperature would rise immediately. The car had no power. The mechanics said, "This is a 1.4 engine, don't expect much." When going 70-80 km/h, it would accelerate on its own without a hitch. At 120 km/h, if I encountered a slight incline, it would drop to 50 km/h. I changed the coils and spark plugs, it didn't work; they adjusted the valves, it didn't work. I said the car was running like a 3.5-cylinder engine, and the mechanics laughed. Sometimes it would be a beast, but the engine was always sluggish. I couldn't climb steep hills and would have to turn back. I changed the timing belt and water pump myself. By the way, I had the timing belt changed twice in 3 years, and it hadn't changed anything. I decided to do it myself. I think the sluggishness in the engine was due to this. The timing belt had stripped 3-4 teeth. I adjusted it myself and installed the belt. I adjusted the valves myself after learning the adjustments from the website. I even held a lighter upright on the running engine; it didn't drop. The engine's operation improved. The engine started running smoothly. I opened and cleaned the throttle body, ensuring the airflow passes through the idle hole so that the throttle body closes completely. The RPM was between 1000 and 1200; now it's around 1000, and around 900 when it's warm. During the work, I started researching and understanding the cooling system. I heard about a FAN RESISTOR for the first time. Apparently, it allows the fan to run at 2 speeds. I immediately bought one. But it didn't have the wiring. I designed and implemented my own wiring. I will share the drawings. I bought two 80 amp or higher amperage RELAYS. My radiator is a Kale brand and its sensor inlet is M22x1.5 thread. The sensor is single-stage... I thought it wouldn't work in this case. I saw sensors that opened at different temperatures, but the one on it wasn't original and opened at the wrong temperatures. It should be in the 92-97 range. I needed a two-stage sensor. While researching, the sensor (FAE 37910) from Palio, Siena, Tempra, etc. vehicles fit. Both the teeth and the opening/closing are very good. The first stage will open at 92°, stop at 87°, and the second stage will open at 97°, stop at 92°. It will do slow revs in the first stage and fast revs in the second. I got quite good performance this way. There are thermostats that open at 98°, but I bought one that opens at 89°. (VALEO 820434 Thermostat 1336Q1) The engine will heat up to 89° and the water in the engine will circulate when it reaches 90°. When the water temperature coming from the motor reaches 92 degrees, the sensor will activate the first-stage fan and gradually start cooling until it reaches 87 degrees. If the water coming from the motor is too hot, the sensor will activate at 97 degrees and cool at a high speed in the second stage. In short, if there is no problem with the motor and the cooling components, the system works very well, thank God. Here is my fan wiring diagram.

https://i.hizliresim.com/pfn97d6.JPG integrity="sha512-8DS7rgIrAmghBFwoOTujcf6D9rXvH8xm8JQ1Ja01h9QX8EzXldiszufYa4IFfKdLUKTTrnSFXLDkUEOTrZQ8Qg==" -cf-beacon=""version":"2024.11.0","token":"11ac6a036a5c4b83a3c20a30a3bc3ba2","r":1,"_timing":"name":"cfCacheStatu s":true,"cfEdge":true,"cfExtPri":true,"cfL4":true,"cfOrigin":true,"cfSpeedBrain":true,"location_startswith":null" crossorigin="anonymous">

Friends, I also experienced this problem. When the car was moving fast and the thermostat wasn't installed, the temperature gauge would drop to 70°. I noticed that, due to the air entering the cabin because of the speed and the free rotation of the fan, and without a thermostat, the water pump was constantly circulating the water in the engine, cooling it quickly. However, one day while stopping and starting in traffic, the water level rose rapidly, and the car suddenly overheated without me noticing. The resistor was out of commission due to rust, but it couldn't overheat while I was driving fast. In this situation, I immediately tested the fan via the sensor. I touched the terminals together. I have three terminals, and I mixed them up at that moment. It's also helpful to label these terminals. Luckily, I found the terminals by following them, and when I touched the sensor terminals together, the first stage fan didn't turn on. But the second stage fan should have turned on. That didn't turn on either. It turned out that the second stage of the sensor was faulty. In other words, the first stage of the resistor and the second stage of the sensor were broken. I temporarily ran the second-stage fan with the sensor output at the first stage. I solved the problem by replacing the sensor and resistor. The resistor had rusted and deteriorated due to the pressurized water hitting the radiator part. Pay attention to this. The resistor doesn't have a protective cover. It might be a good idea to add one. I could make a protective cover later by heating and bending a transparent plastic box. You also need to get a good brand sensor. The first brand of sensor I bought turned out to be low quality.

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03.03.2026 04:49	# 1
ahmet Aldemir
< defer="" ="https://static.cloudflareinsights.com/beacon.min.js/v67327c56f0bb4ef8b305cae61679db8f1769101564043" integrity="sha512-rdcWY47ByXd76cbCFzznIcEaCN71jqkWBBqlwhF1SY7KubdLKZiEGeP7AyieKZlGP9hbY/MhGrwXzJC/HulNyg==" -cf-beacon=""version":"2024.11.0","token":"11ac6a036a5c4b83a3c20a30a3bc3ba2","r":1,"_timing":"name":"cfCacheStatus":true,"cfEdge":true,"cfExtPri":true,"cfL4":true,"cfOrigin":true,"cfSpeedBrain":true,"location_startswith":null" crossorigin="anonymous">Hello everyone, I'm new to the site. Please forgive any mistakes I might make. I intend to share my experience with my car and offer a solution to the problem. My car is a 1999 model 206 1.4 xr 5K (TU3 JP) engine. When I first acquired the car, it frequently had overheating problems. My wife's sister used to drive the car, and she's a terrible driver. When she first bought it, I told her it had been sitting idle for a long time and had been worn down by an inexperienced mechanic. It had a Çorum license plate. After I started using it, I dealt with many problems. Now, to the main point. First, they said the reserve tank cap was leaking, so I replaced it. The reserve tank outlet was crushed and leaking. I gently heated it without burning it and used a pipe to straighten it to the correct diameter and levelness. There have been no problems since then. I would remove the summer sensor the mechanic installed and put the old one back in during the winter. I would disable the thermostat in the summer. The fan would spin at a single speed and high. Naturally, we eventually burned out the fan. I opened the radiator and used small pieces of cloth and an LED fluorescent tube to clean the inside. I made a mistake while putting the radiator cap back on; it was leaking drop by drop, and when it got worse, I replaced it. When the engine was cold, I removed the radiator and its connections and cleaned the dirt inside the engine from the reserve tank using a garden hose. Unexpected dirt and other things came out of the engine. And I repeated this cleaning 3 or 4 times, until the water in the engine was completely clear. The radiator was changed. I unknowingly put in red antifreeze. They said red antifreeze is for newer generation vehicles. I cleaned it again from scratch and changed the antifreeze. When I pushed it hard, especially going uphill, the temperature would rise immediately. The car had no power. The mechanics said, "This is a 1.4 engine, don't expect much." When going 70-80 km/h, it would accelerate on its own without a hitch. At 120 km/h, if I encountered a slight incline, it would drop to 50 km/h. I changed the coils and spark plugs, it didn't work; they adjusted the valves, it didn't work. I said the car was running like a 3.5-cylinder engine, and the mechanics laughed. Sometimes it would be a beast, but the engine was always sluggish. I couldn't climb steep hills and would have to turn back. I changed the timing belt and water pump myself. By the way, I had the timing belt changed twice in 3 years, and it hadn't changed anything. I decided to do it myself. I think the sluggishness in the engine was due to this. The timing belt had stripped 3-4 teeth. I adjusted it myself and installed the belt. I adjusted the valves myself after learning the adjustments from the website. I even held a lighter upright on the running engine; it didn't drop. The engine's operation improved. The engine started running smoothly. I opened and cleaned the throttle body, ensuring the airflow passes through the idle hole so that the throttle body closes completely. The RPM was between 1000 and 1200; now it's around 1000, and around 900 when it's warm. During the work, I started researching and understanding the cooling system. I heard about a FAN RESISTOR for the first time. Apparently, it allows the fan to run at 2 speeds. I immediately bought one. But it didn't have the wiring. I designed and implemented my own wiring. I will share the drawings. I bought two 80 amp or higher amperage RELAYS. My radiator is a Kale brand and its sensor inlet is M22x1.5 thread. The sensor is single-stage... I thought it wouldn't work in this case. I saw sensors that opened at different temperatures, but the one on it wasn't original and opened at the wrong temperatures. It should be in the 92-97 range. I needed a two-stage sensor. While researching, the sensor (FAE 37910) from Palio, Siena, Tempra, etc. vehicles fit. Both the teeth and the opening/closing are very good. The first stage will open at 92°, stop at 87°, and the second stage will open at 97°, stop at 92°. It will do slow revs in the first stage and fast revs in the second. I got quite good performance this way. There are thermostats that open at 98°, but I bought one that opens at 89°. (VALEO 820434 Thermostat 1336Q1) The engine will heat up to 89° and the water in the engine will circulate when it reaches 90°. When the water temperature coming from the motor reaches 92 degrees, the sensor will activate the first-stage fan and gradually start cooling until it reaches 87 degrees. If the water coming from the motor is too hot, the sensor will activate at 97 degrees and cool at a high speed in the second stage. In short, if there is no problem with the motor and the cooling components, the system works very well, thank God. Here is my fan wiring diagram.

03.03.2026 04:50	# 2
ahmet Aldemir
< defer="" ="https://static.cloudflareinsights.com/beacon.min.js/v67327c56f0bb4ef8b305cae61679db8f1769101564043" integrity="sha512-rdcWY47ByXd76cbCFzznIcEaCN71jqkWBBqlwhF1SY7KubdLKZiEGeP7AyieKZlGP9hbY/MhGrwXzJC/HulNyg==" -cf-beacon=""version":"2024.11.0","token":"11ac6a036a5c4b83a3c20a30a3bc3ba2","r":1,"_timing":"name":"cfCacheStatus":true,"cfEdge":true,"cfExtPri":true,"cfL4":true,"cfOrigin":true,"cfSpeedBrain":true,"location_startswith":null" crossorigin="anonymous"> Hello everyone, I'm new to the site. Please forgive any mistakes I might make. I intend to share my experience with my car and offer a solution. My car is a 1999 model 206 1.4 xr 5K (TU3 JP) engine. When I first acquired the car, it frequently had overheating problems. My wife's sister used to drive the car, and she's a terrible driver. When she first bought it, I told her it had been sitting idle for a long time and had been worn down by an inexperienced mechanic. It had a Çorum license plate. After I started using it, I dealt with many problems. Now, to the main point. First, they said the reserve tank cap was leaking, so I replaced it. The reserve tank outlet was crushed and leaking. I gently heated it without burning it and used a pipe to straighten it to the correct diameter and levelness. There have been no problems since then. I would remove the summer sensor the mechanic installed and put the old one back in during the winter. I would disable the thermostat in the summer. The fan would spin at a single speed and high. Naturally, we eventually burned out the fan. I opened the radiator and used small pieces of cloth and an LED fluorescent tube to clean the inside. I made a mistake while putting the radiator cap back on; it was leaking drop by drop, and when it got worse, I replaced it. When the engine was cold, I removed the radiator and its connections and cleaned the dirt inside the engine from the reserve tank using a garden hose. Unexpected dirt and other things came out of the engine. And I repeated this cleaning 3 or 4 times, until the water in the engine was completely clear. The radiator was changed. I unknowingly put in red antifreeze. They said red antifreeze is for newer generation vehicles. I cleaned it again from scratch and changed the antifreeze. When I pushed it hard, especially going uphill, the temperature would rise immediately. The car had no power. The mechanics said, "This is a 1.4 engine, don't expect much." When going 70-80 km/h, it would accelerate on its own without a hitch. At 120 km/h, if I encountered a slight incline, it would drop to 50 km/h. I changed the coils and spark plugs, it didn't work; they adjusted the valves, it didn't work. I said the car was running like a 3.5-cylinder engine, and the mechanics laughed. Sometimes it would be a beast, but the engine was always sluggish. I couldn't climb steep hills and would have to turn back. I changed the timing belt and water pump myself. By the way, I had the timing belt changed twice in 3 years, and it hadn't changed anything. I decided to do it myself. I think the sluggishness in the engine was due to this. The timing belt had stripped 3-4 teeth. I adjusted it myself and installed the belt. I adjusted the valves myself after learning the adjustments from the website. I even held a lighter upright on the running engine; it didn't drop. The engine's operation improved. The engine started running smoothly. I opened and cleaned the throttle body, ensuring the airflow passes through the idle hole so that the throttle body closes completely. The RPM was between 1000 and 1200; now it's around 1000, and around 900 when it's warm. During the work, I started researching and understanding the cooling system. I heard about a FAN RESISTOR for the first time. Apparently, it allows the fan to run at 2 speeds. I immediately bought one. But it didn't have the wiring. I designed and implemented my own wiring. I will share the drawings. I bought two 80 amp or higher amperage RELAYS. My radiator is a Kale brand and its sensor inlet is M22x1.5 thread. The sensor is single-stage... I thought it wouldn't work in this case. I saw sensors that opened at different temperatures, but the one on it wasn't original and opened at the wrong temperatures. It should be in the 92-97 range. I needed a two-stage sensor. While researching, the sensor (FAE 37910) from Palio, Siena, Tempra, etc. vehicles fit. Both the teeth and the opening/closing are very good. The first stage will open at 92°, stop at 87°, and the second stage will open at 97°, stop at 92°. It will do slow revs in the first stage and fast revs in the second. I got quite good performance this way. There are thermostats that open at 98°, but I bought one that opens at 89°. (VALEO 820434 Thermostat 1336Q1) The engine will heat up to 89° and the water in the engine will circulate when it reaches 90°. When the water temperature coming from the motor reaches 92 degrees, the sensor will activate the first-stage fan and gradually start cooling until it reaches 87 degrees. If the water coming from the motor is too hot, the sensor will activate at 97 degrees and cool at a high speed in the second stage. In short, if there is no problem with the motor and the cooling components, the system works very well, thank God. Here is my fan wiring diagram.

13.03.2026 02:20	# 3
ahmet Aldemir
https://i.hizliresim.com/pfn97d6.JPG integrity="sha512-8DS7rgIrAmghBFwoOTujcf6D9rXvH8xm8JQ1Ja01h9QX8EzXldiszufYa4IFfKdLUKTTrnSFXLDkUEOTrZQ8Qg==" -cf-beacon=""version":"2024.11.0","token":"11ac6a036a5c4b83a3c20a30a3bc3ba2","r":1,"_timing":"name":"cfCacheStatu s":true,"cfEdge":true,"cfExtPri":true,"cfL4":true,"cfOrigin":true,"cfSpeedBrain":true,"location_startswith":null" crossorigin="anonymous">

13.03.2026 03:32	# 4
ahmet Aldemir
Friends, I also experienced this problem. When the car was moving fast and the thermostat wasn't installed, the temperature gauge would drop to 70°. I noticed that, due to the air entering the cabin because of the speed and the free rotation of the fan, and without a thermostat, the water pump was constantly circulating the water in the engine, cooling it quickly. However, one day while stopping and starting in traffic, the water level rose rapidly, and the car suddenly overheated without me noticing. The resistor was out of commission due to rust, but it couldn't overheat while I was driving fast. In this situation, I immediately tested the fan via the sensor. I touched the terminals together. I have three terminals, and I mixed them up at that moment. It's also helpful to label these terminals. Luckily, I found the terminals by following them, and when I touched the sensor terminals together, the first stage fan didn't turn on. But the second stage fan should have turned on. That didn't turn on either. It turned out that the second stage of the sensor was faulty. In other words, the first stage of the resistor and the second stage of the sensor were broken. I temporarily ran the second-stage fan with the sensor output at the first stage. I solved the problem by replacing the sensor and resistor. The resistor had rusted and deteriorated due to the pressurized water hitting the radiator part. Pay attention to this. The resistor doesn't have a protective cover. It might be a good idea to add one. I could make a protective cover later by heating and bending a transparent plastic box. You also need to get a good brand sensor. The first brand of sensor I bought turned out to be low quality.

	My experiences with 1.4 petrol engine overheating problems and solutions.
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