Could be blown head gasket, if so you should have quiet a bit of white smoke also if this is problem.
SOURCE: Highway driving problem. City driving ok.
If you have been to three shops,I'll assume that all the basics have been covered. Did anyone check computer stored codes? What did they see? If you are going to try to fix it yourself, you will need to get a manual and check each and every component, one by one. Also, outside of the realm of computer stuff, check converter to make sure its not partially plugged. At low rpm city driving it may be flowing just enough to get by on. Also check that fuel is clean and has no water in it.
SOURCE: 2001 Jetta, A/C charged, compressor turns on, only hot air
Compressor may be weak and not be building enough pressure
SOURCE: I have a 94 mazda mx-6 that overheats. It's fine
Are the fans turning on when in overheat? If not you might have a fan, relay or sender circuit problem.
Sender circuits monitor the cooling liquid temperature and then sends a signal to turn on the fans if it senses that the temp has exceeded the normal operating temp.
SOURCE: jeep overheats quickly at city driving , not at
city driving does not force air through the radiator like highway driving does. if it has overheated, suspect a blown head gasket caused by expansion of the head when warm rubbing against the gasket and tearing it. could be the water pump, pull a heater hose and start engine. if coolant blasts out, pump is working. caution!! coolant may be hot!!! if it trickles, you have a restriction or a bad pump. stupid question, you have coolant in the radiator, right?
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