Check the cooling fan relays. in the relay box it will be marked cooling fan realy
use a test light to see if you have a 12volt hot going in and after the temp startsto move up, you should then have another 12volt hot going outof the relay. if you do the fam motors are bad. 1 will come on automaticly when you turn on the A/C or heater in the defrost mode. check that first.
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