Problems with 206 automatic car overheating

Hello friends. My 2008 model automatic Peugeot car started to give gas on its own when it got too hot in the summer in traffic, and it started to stop when I press the gas. There is no problem when the car is warm. Also, when it gets hot between Bursa and Istanbul in the summer, when I enter Istanbul traffic, it makes a thud from the back when I press the brake and stop. What do you think is the problem?

Sir, if the oil cooler is faulty, it will do it. Or there are teflon bushings on the back of the gearbox, so it can do it. If there is a problem in the Teflon part on the back, it can be repaired by simply opening the back part without a complete revision. It's half the cost of the revision.

Thank you Sir. I would like to have a complete overhaul because the car prices have gone up, the new one can't afford it. The car is 2008 model at 155 thousand km (it was at 125 thousand when I bought it about 6 years ago) How much does a complete overhaul cost? How much does a Teflon replacement cost?

3-5 months ago, when the Revision started around 15000, it was around 5 pm that the back part was opened and the teflon bushings changed.

Unfortunately, every place can fit it now. It is necessary to investigate and find the one who makes it affordable. Of course, the one who does it properly. The market has been weird.