Neusier

Hello guys!!

I will try to explain the problem I had this morning with my Cherokee XJ with the lovely renix 4.0 engine... During the summer I had some overheating problems with the Jeep. Sorry for my poor technical english but this language is not my mother tonge... maybe you figured out from the first sentence.

Firstly, going for a route I noticed that the temperature indicator was about to get the red band and I stopped but the expansion vessel cracked leaking the cooling liquid. Bought a new one and changed the vessel and the thermostat. After two week I took again the Jeep to make another route and again the overheating issue. This only happens in ramps, never in plain road. I took it to a mechanic and he noticed that the radiator wasnt cooling enough and he changed it. The mechanic told me as well that maybe the cylinder head had a problem because after trying the car the cap of the expansion vessel was suddenly released leaking again the cooling liquid.

We refilled it but ... after leaving the mechanic shop we went for a ride and after asking the engine some efforts the cap was released again.

What you think this could be? Cylinder head? The cap is crap?

Best regards and hope the text is legible enough

BlueRidgeMark

Hi, and welcome!

Don't worry about your English - you are doing just fine!


This might be a cracked head or a blown head gasket. In America, most auto parts stores carry a kit that can be used to check for exhaust gasses in the coolant. It's not expensive. If you can find such a thing in your country, I suggest you buy one and use it.

It's also possible that you just have a system that needs to be cleaned out, or that your water pump is bad. The impellers that push the coolant can be eroded over time so that they are much less effective.

I suggest you check for the exhaust gases first, and if they are fine, then flush your system and replace your water pump.