Having problems with your GMC Jimmy ?
How to uninstall a blower motor on a 1999 GMC Jimmy? Blower motor does not work sometimes but if I beat on the blower motor housing then it will start running.
Yeah if you have to tap on it, then that means the brushes in the motor are worn out and you need to replace it. The blower motor is behind the PCM and Coolant Overflow bottle. If you remove these then it will give you better access to motor. You'll have to cut around housing. There should be a groove already there for you, just make sure you don't cut all the way around it. Once you open it and get the new one installed, you'll have to use caulk to seal where you cut it at.
Repair Help & Product Troubleshooting for GMC Jimmy
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