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You have relays for the cooling fans. Did you check applicable fuses and voltage on fuse circuits? Any applicable trouble codes?
Check the coolant temp sensor. Don't replace anything unless your testing points in that direction.
The low speed fan comes on about 223 degrees F, hi speed about 230 degrees f.
If you turn on the ac, the fan/s may run? On some makes and models, if you unplug the coolant temp sensor, the fan/s may run?
if its the same set up as my oldsmobile intrigue there is a plug behind the glove box that has a sensor board, my fan quit working all together and I swapped that sensor out and everything worked fine afterwards, does your right side passenger floor board get wet when it rains hard, if so it has shorted part of the sensor out for the high side of the fan.
remove lower right dash insulator panal from beneath glove box. slide bcm aside to get to blower. remove the three screws holding the blower motor, pull blower and fan straight out. remove fan from old blower if replacing with a new motor. good-luck!!
I just did this fix to mine. It is the blower motor resistor that is located between the fan motor and the firewall. You will have to remove the trim panel, under the dash. Then you will be able to remove the fan motor. The fan plugs directly into the resistor. You can get the part at checker for about $32.
It is a 99% chance you need a new fan speed resistor board. It is beside the fan motor.... it sits in the heater/AC duct work to use the air flow to cool itself. It costs about $35 and takes 15 mins to change. Did you loose one speed then another and now only high works? That's the usual way they fail.
I assume you are talking about whether or not the blower fan is running. I had a similar problem. The likely cause is the resistors that control the motor speed. I took off the resistor pack and because it didn't look like any of the electronics were damaged I replaced the blower motor and that fixed it. One or the other, or both should do it.
Check fuses first.
Follow the blower wires. I believe you should find a relay. I suggest testing it as well. Make sure it is good. Also make sure fuse is good and secure. Test your control switches and check all the vacuum lines and wiring