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I have a 1978 coupdiville Cadillac my blower quit working and there is a relay above your fuse box and if it goes bad your heater wont turn on. I had to replace it with a after market heavy duty relay away from where it is originally plugged in. Also my ground wire connection was dirty and wouldn't turn on until I cleaned the connection so try that and see if it works or you might need to replace the motor.

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Q: What would cause no heater fan to blow on 1978 Cadillac fleetwood?
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