Originally Posted by Jepale

Hi everyone. I have been a voyeur to this site for years, and I thank everyone for all the problems it helped me solve. This is a awesome site, but I now have a problem that I can't find the answer!

My wife's x-type starts to overheat when at an idle or up to 1.5k RPM. It moves (temp gauge) in small spurts past the normal until it overheats, but if I increase the RPM to around 2k, I can watch the gauge drop back down in small spurts until it is back to center gauge. I have replaced the water pump thinking that where wasn't enough flow, nope. I replaced the thermostat thinking it might be sticking until the pump pressure increased, nope. I replaced the coolant reservoir cap thinking it wasn't holding pressure and causing the problem (reaching here), nope. I burped and burped this cat thinking there might be an air bubble near sensor and the increased flow pushes it out of the way temporarily, but nothing changed (at least the kids stopped crying after I burp them!). I don't have any leaks, and the fans come on at idle (once at operating temp). If I don't let the car run until it starts to overheat the fans turn off with the car. If I run the car enough to overheat (not really overheat just above normal operating temp) the fans stay on after I turn the car off. Not sure if that makes a difference or not, but it seems very logical to me. Any help would be greatly appreciated, my wife has taken my car until I can resolve this