Thread: If heater blower isnt working and I tap it it turns on

The heater blower motor was replaced and this is still happening. It happens maybe 1 out of 7 times i drive. I turn on the heater or ac and the blower isnt turning on. If I reach over on the passenger side floor area and punch the blower motor it will turn on. any thoughts?
Seems to only happen when first getting into car. If the blower is working, it will never stop on me. Just wont turn on at times when first going into the car..

It could be a bad motor, a bad contact in one of the connectors, or the resistor.

First and probably the easiest...check the connectors. Look for cooked terminals and housings as well as corrosion. Something that will be fairly hard to spot is that the terminals used on modern GM cars have very thin terminals. Sometimes, they'll open up to the point where contact with the mating pin is spotty. If you can stop the car and wiggle the connectors to get the motor turning again, you've probably found your culprit. For corrosion issues, try contact cleaner, available at any good electronics stores. Burnt or loose connectors are probably best replaced, but they're pricey. They come as "pigtail" assemblies from the dealer, and for the resistor connector, don't be shocked if it's over $75.