Having problems with your 1997 Buick Riviera ?
Heater fan short.....Fan quits working. Relay or something loose?
Check the heater motor hot lead as well as the ground wire on the heater motor they have common ground fault issues that result in bad / weak connections also check the fam motor speed control resistor located under the hood in the AC/heater box
Repair Help & Product Troubleshooting for 1997 Buick Riviera
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