My thermostat was replaced. When driving the vehicle away, the A/C was turned on and the vehicle almost died. While at a stop sign it did die. When the A/C was turned off it ran fine. The air compressor kicks on and off every 5 to 8 seconds when turned on. Took it back to mechanic, he stated i needed a new compressor. Took it to another mechanic he stated low on freon. System was recharged still the same problem. After a few days, sometimes it works fine, sometimes it doesn't. Don't think i need a compressor air blows cold just engine idles down. Please HELP!!!
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There was a recall on the 2002 and some 2003 made in late 2002. Gm was replacing engines under this recall. If your not covered under this warr, check to see if there are small chips or metal in the intake. That engine was known for cracking cylinder sleeves .
Check the wiring and connections on the coolant temperature sensor that I believe is on the thermostat housing. If they look good, replace the sensor. It is pretty rare to have an electric cooling fan motor fail but not impossible. They are usually very expensive. Expensive enough that you will want to make sure that is the problem before you replace it. Usually the sensor will fail. **Please rate me on this answer.**
you have a short to power which will cause it to stay on constantly check your blower motor resistor pack to ensure that it is working and check the wires going to the blower to make sure you have a power and a ground
Most if not all repair manuals for vehicles these days covers replacing the thermostat. Your best solution is to puchase one of these manuals for your vehicle from the local automotive supply store (autozone, petboys.. )
Now while i don't know your particular vehicle, i can make the safe assumption that you will need to remove the pump (or housing on the pump) to swap out the thermostat. Mostly this involves removing the housing bolts, and simlpy removing the outlet block, and replace the thermostat / gasket (if required) and replace everything.. .
again, this is not a howto guide, just from recollection. Your best, and safest bet is to get the manual, and follow it. They are usually pretty easy to replace inless you have one of those foriegn jobbies..