Hey guys I'm back again.

My daughter called me earlier today to come get her as she was stranded, her TJ had overheated.

I replaced the water pump in it when I done the timing belt and tensioners etc, however I had forgotten to replace the thermostat, so before I went to rescue her I bought a new one and fitted it at the side of the road, the car got her home and seemed to be OK, but she just called me to tell me it is doing it again. There is no oil in the water but the system seems to over pressurize, I am wondering if there is a possible blown head gasket that is leaking exhaust gasses into the cooling system???.

I no longer have my pressure test system to check this myself, the thermo is working correctly and I have tried running it with the AC to help cool it with its fan but it is still over heating, it seems fine out on the open road but as soon as you get into town she starts cooking......it's doing my head in....perhaps radiator.....I guess that will be my next option.

Any help would be appreciated.

Terry.

Is hard or should I say impossible to diagnose such a thing over the internet.

I doubt would be the head gasket, rare to do a Head Gasket unless been extremely hot, fact that while at higher speed also does not over heat also tells me not gasket.

Is the Thermostat you got a genuine one or aftermarket, often the aftermarket ones are rubbish

I was slowly loosing water driving around town. Went into the city one day and after a number of traffic stops the guage shot up. When I looked under the bonnet straight away I saw a very fine fan of mist spraying on the engine from a small slit in the back of a small hose. Clearly as it sprayed as a mist onto the hot engine and when the engine was hot it never showed in town as it evaporated quickly and the pressure dropped....... Check hoses when overheating?