I think he was refering to the cooling fan relay, but that wouldn't cause the problems you mentioned. It could cause the radiator fans to not work.
Have you checked the fuses under the hood? Also, under the hood is the relay block. You can check the relays. Under the lid it will list what each relay is for. Look for the one for (lets say) the blower motor. Switch it with one of the relays from the same area that has the same part number to see if makes a difference. If the part starts working, replace the relay with a new one.
Let me know what you find.
Saturday, November 20th, 2010 AT 6:13 AM