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Sudden Temperature Rise and Fall |
| • Homepage » PEUGEOT MODELS (FAULTS AND SOLUTIONS) » 407 | |
| 08.05.2020 21:00 | # 1 |
 savasdemirci |
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The thermostat has changed, the radiator and radiator fan (sub-industry) have changed, the heat sensor has changed, but the situation is the same. The radiator started to crumble because it was so old, the fan was wobbling too much while turning, so it changed. 1. What is the water temperature I should be afraid of for 407 1.6 hdi? 2. Anyone have any idea about this breakdown? |
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| 08.05.2020 21:00 | # 2 |
 sonerkyl |
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Normally it shouldn't exceed 90 degrees, hodja. The problem may be in the recirculation pump when the recirculation pump has changed. It seems to me that the water circulation is not rahar in the vehicle. Well, I was added to the vehicle. or the vehicle was previously used without antifreeze.
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| 08.05.2020 21:00 | # 3 |
| savasdemirci |
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Hello, it was not used without antifreeze yesterday, we poured it and filled it with new organic 3lt antifreeze and added purified water, but the problem did not change. Frankly, I do not know if the circulation pump has changed.
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| 08.05.2020 21:00 | # 4 |
 HasGur |
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[QUOTE = savasdemirci] suddenly goes up to the maximum on the display when he gets a little higher [/ QUOTE] Fan resistance malfunction. Fan 2nd stage does not work or there is no contact in the return line from the control pin 4 on the four pin socket even though the fan turns on. When the indicator reaches the end, the chassis on pin 1 (normally + 12volts, pulls the ECU to the chassis to turn on the fan) and check pin 4 on +12.
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| 08.05.2020 21:00 | # 5 |
 talip206 |
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[QUOTE = HasGur] [QUOTE = savasdemirci] suddenly rises to the maximum on the display when it gets a little higher [/ QUOTE] Fan resistance malfunction. Fan 2nd stage does not work or there is no contact in the return line from the control pin 4 on the four pin socket even though the fan turns on. When the indicator reaches the end, the chassis on pin 1 (normally + 12volts, pulls the ECU to the chassis to turn on the fan) and check pin 4 on +12. [/ QUOTE] I don't know if the fan resistance and roles are the same thing, but as you said, the temperature in me fell instantly. I checked the green role on the front and made oxide. As far as I can tell you, when you fail the role as you say, the car disables the role and the fan runs automatically. After a while, the temperature repeats the same, when the heat does not transmit the role to the role, the temperature is over. I couldn't make a technical explanation but I think we are talking about the same thing :)
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| 08.05.2020 21:00 | # 6 |
| savasdemirci |
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Thank you guys for your help, the problem was on the radiator fan and as you said, the second stage did not open, the fan has changed. What should be the degree that should be normal? When I force the fan to turn on at 96 degrees, I see 104 degrees and it works at an average of 95 degrees. Are these temperatures normal?
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| 08.05.2020 21:00 | # 7 |
| HasGur |
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[QUOTE = talip206] car disables some kind of role and fan runs automatically [/ QUOTE] The fan resistance has 2 relays and a resistance that changes the temperature value in order to detect the heat in the 1st stage and adjust the fan speed, namely a ntc type thermistor. Operation of the fan managed by ECU is done on this part, that is, the fan will not work if the fan resistance is defective.
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| 08.05.2020 21:00 | # 8 |
| HasGur |
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[QUOTE = savasdemirci] When I turn on the fan at 96 degrees I see 104 degrees when I force it to work at an average of 95 degrees [/ QUOTE] To open the thermostat slightly above 80 degrees, the hot liquid circulating in the engine gradually begins to mix with the cold liquid in the radiator . If the temperature continues to increase, after a while the thermostat is fully opened and all the liquid has reached the same temperature. If the cooling system is not problematic, it will remain between 75-90 degrees and not even 90 degrees. Having the air conditioner on causes heat to rise faster, but does not raise the set max temperature. If there is no stop / start in traffic, long ramp, no motor compression, the fan will not work in the 2nd stage when the air conditioner is turned off. You should decide for yourself whether there is a problem in the cooling system according to the conditions you use the vehicle and the temperature in the indicator. Except for exceptions such as low gear ramp on the mountain road, regardless of load and air temperature on the long road, the indicator 90 does not exceed much, generally it remains stable around 80 degrees.
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| 08.05.2020 21:00 | # 9 |
| savasdemirci |
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As far as I understand from your answer, can there be a problem with my cooling system?
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| 08.05.2020 21:00 | # 10 |
| HasGur |
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[QUOTE = savasdemirci] As far as I understand from your answer, can there be a problem with my cooling system? [/ QUOTE] Are the values you provided from the odb device or the data correct? What is the situation on the indicator? You have replaced all parts other than the engine, the circulation and hoses connected to the engine remain. What was the situation before the change? Is there air in the system? If the problem started after the change, the most important part is the radiator, some sub-industry products may not provide sufficient cooling. It was once a castle brand assembly product. The newly installed thermostat may be opening at a higher temperature than it should be, etc. etc. On the other hand, other than cooling system parts, there may be different reasons such as problems in exhaust discharge, narrowing / clogging of in-engine water channels. As I wrote before, only you can understand the net situation. Drive 20-30 km on a traffic and not too inclined route. Cross the road halfway around 90km / h and the rest 130 km / h and above. The temperature indicator should remain in the same position on both parts. There is a problem if the high-speed pointer indicates more temperature, or if you see 100 degrees on the gauge, as you mentioned in any case.
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| 08.05.2020 21:00 | # 11 |
| savasdemirci |
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The value odb device results fall between 90 and 90 after the indicator. There was no such problem before the change. Frankly, I don't know if there is air. Is there a setting if the thermostat opens late?
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| 08.05.2020 21:00 | # 12 |
| HasGur |
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[QUOTE = savasdemirci] Value odb device results, the indicator falls between 90 and the line after 90. There was no such problem before the change. Frankly, I don't know if there is air. Is there a setting if the thermostat opens late? [/ QUOTE] If the indicator stays around 90 in the city, there is no temperature problem. In this case, you can test whether there is a problem in the cooling system by checking if there is an increase in the indicator when you enter heavy traffic instead of making 20-30 km road, which I recommend to avoid risk. The temperature of the thermostat installed is fixed, the quality of the products written on poor quality products may differ slightly. If the indicator is around 90, if you get different values such as 104 over ODB, compare the data by installing a few different applications.
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