Hey All, so I have a 93 GMC and the heater blower is only working sporadically. When it does not work, I can sometimes get it to work by opening and then closing the door. The heater is sending out hot air, it’s just that the blower only works like 50% of the time. Any ideas of how to fix this on my own? Thanks for any help.
Most likely it is the blower motor itself. You can check it by measuring the voltage at the blower motor connector when the blower should be running, but isn’t. If it’s 12V or more, then the blower motor is bad.
More than once I’ve just had corroded connections at the blower motor itself. Pull the plug on the blower & check for rust/looseness.