Does is have a new water pump? Used engines can have worn out pumps.
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well, i touch the thermostat hose and i feel its cold as there is no water there… thats how i know its not open… what do you actually mean? and yeah water pump new
will surely check that, i really wonder if that’s the case…
When idling the upper hose is hot but when driving it is cold?
Then do as suggested, try driving without the thermostat to find out if water is circulating.
BTW, are you getting heat from your car’s heater?
Are you running the correct coolant?
As Tester pointed out, transmission generates a lot of heat, but does not explains why upper radiator hose does not get hot when engine is overheating.
Unless someone routed the serpentine belt wrong and the water pump is turning backwards.
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the thermostat hose is not the upper one its below, i drove without thermostat and water circulated all the time. getting heat your mean from the ac? yeah everything works.
yeah using the correct coolant. engine been replaced twice already… i doubt if something installed not right to have the same problem 3 times…
Air trapped in system, blocking circulation, requiring bleeding the system?
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well that was the first thought, but mechanic said the is no air in the system
If there were air in the system, there would be no heat at times because the heater core is the highest point in the cooling system.
Tester
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Please post a picture of your engine and hoses.
the mark i did is where the thermostat hose at, i don’t know if you able to see that from the picture, but that is where it is and i marked where the hose is coming from, from below of the radiator to the engine.
I found that the radiator fan running backward was the cause of that problem. And 3 shops including a dealership couldn’t diagnosis it.
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The thermostat is located in the water inlet at the lower hose on the engine block; however, the direction of water flow is through the upper hose. What is the coolant temperature when the problem occurs?
can’t tell you exactly the temp as it changes all the time because of the problem… between 95-120c. i guess that if we were in the summer, it would be much higher as its really hot in here in summers.
After what distance of driving? If the thermostat remained closed, the engine temperature would exceed 120 C after 4 to 5 miles and you would have to stop the engine. Insufficient details.
Aiden is not in the USA and has a Peugeot that no one can fix . He needs a better shop or vehicles that someone can fix.
Are you a troll or something? Dont say anything if you don’t want to help.
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Well i cant know exactly when its closing but i do know its after i start to drive. It doesn’t exceed 120c for now…
The thermostat should be closed when you start to drive, then open after 3 to 4 miles. If the thermostat were to close while driving, the temperature would spike and you would need to stop the engine. It seems there is a circulation problem, a closed thermostat is unlikely to be the problem.
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If so i will check that again… as you said something is not clear here and i agree… just hard to figure out all the details since so much is happening.
So you’re referring to a small hose that you call the ‘thermostat hose’, correct? Not the large radiator hoses that actually circulate the coolant through your engine and radiator? It could be a hose used to allow a small amount of circulation prior to the thermostat opening, to help the thermostat warm up an open. The opening to the hose could be closed once the thermostat opens.
You said it gets hot - is that from the temperature gauge? Do both large radiator hoses get hot when the engine is warmed up?