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Check the fuses first, swap relays. If that doesn't work. Takes a scanner to see what is not working. If the PCM is getting the signal, then look to the wiring to the fuse panel, to the relays. Cold be the relay/fuse panel.
Yes, it is possible to install a thermostat backwards, though unlikely. If the thermostat isn't opening properly, the hot engine coolant won't be flowing over the cooling fan switch and give you high temps. I would first determine if the thermostat was opening at all, and if it is, is it opening at the proper temp. I have had many new thermostats that, while new, didn't work correctly. To check the cooling fan motor, turn on the AC(if equipped) and the fan should engage. If no AC, disconnect the cooling fan switch, and the fan should engage. Check for power and ground at the fan motor. If you have both power and ground, the fan motor is faulty
Look for a seperate fuse in the area by the heater motor. Many cars use a seperate circuit for High speed. Usual fuse is in the fuse box for all speeds except High. Larger diameter wire and fuse goes directly to the motor or a relay.Usually in the engine compartment.
It could be the belts that are slipping on initial start-up. When the belts are cold, they will slip if the belt(s) are loose. It could also be the tensionoer pully. This is not normal for any vehicle under any circumstances. Good Luck Jim
What kind of sound? If it squeals then the fan belt needs tightening or replacing. If the sound is the engine increasing in speed when the compressor engages then that's normal.
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