Fan motor works with power directly to it. Relay in under hood fuse box good. what could the problem be?
SOURCE: 95 mercury tracer trio/ ford escort wagon
engine coolant temperature sensor unit!? you say you had a thermostat issue some times if you over heat these the switch above might cause malfunction! I just spent 7 hours on relays!! with engine running un plug coolant sensor temp switch if your fan comes on you have no relay issues!! or ground problem keep in mind this switch tells the system the temperature then when reached sends signals to relay the fan to come on! when I unplugged mine fan ran plugged it back in off!!! replaced switch works great this is the true way to test don't get$$ it out hope this helps you out also be sure you have no air locks in your cooling system and you properly bleeded out all air sense you changed thermostat.John
SOURCE: can't locate the cooling fan sensor or relay.
the radiator fan relay is located behind and slightly lower than the r/f headlamp.best way to get to this is by removing right side of front fascia out enough to get behind it. this will give you acsess to the relay.i work at a jeep dealer and have done this many times.
SOURCE: can some post the 1999 gmc sierra wiring diagram
you don't have enough pressure in your system. odds are you have a leak someplace and the factory installed a saftey switch to keep the ac from running when there is no pressure. This way you don't end up burning up your compressor.
SOURCE: 1999 Isuzu Trooper Problem with Blower Motor, FUse Box, and exter
Did you find out a solution to your problem? I have a 1996 trooper that is showing most of the same symptoms that you have. I'm curious as to your fix. Was it simply a bad ground?
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