If I were you, I would plug my multimeter on the blower motor's terminals and check if it gets some juice (voltage ~12 V) when I turn on the blower on the controls on the dash. This would let you know if you have a working motor. If it doesn't get power, I would check for a dead fuse/relay before looking more into the dash assy.

Good luck,

Lova Andriamanjay

Good advice from landriamanjay. One common problem that I have seen repeatedly on the GM products is a poor ground on the blower motor itself. When you are testing, use a known quality ground for your test light or meter. Then test the purple wire that supplies power to the motor. Next test the outer housing of the motor. If it also shows live, ground that motor. Good luck.

I have suffered blower motor failure on a couple of GM vehicles due to wear on the motor sleeve bearing. Sometimes I have fixed it by placing a few "dimples" in the end of the bushing. It tends to dstort the sleeve enough to shift the rotor back into center and stops the contact between rotor and stator laminations. Its a short term fix for high milage vehicles when you want to complete a trip and get it fixed back at the fleet shop instead of an expensive repair out in the filed.

On a couple of GM vehicles I have also discovered corrosion and heavy oxidation on the fan motor speed resistor block. This is the insert into the air stream which as a plug with three wires to th espade connector. The resistors are air cooled and the resistors are placed in series with the motor winding to select low faster and fast speeds. Witrh A/C MAX all resistors are omitted and the blower really blows.

faulty blower relay likely, suspect passenger side in engine compartment near firewall or part of fuse box arrangement.

Could be resistor under glove box passenger side

The fans in Chevy trucks never work properly. Chevy trucks suck, so the fans can't work...

I had the same problem with my 1995 s10. I cleaned the contacts in the connector for the motor and pulled the motor out to check for any debris in the motor housing. It has worked ever since.

I always keep a large size paper clip in ash tray for just such occasion. Open the clip and slip each end into opposite legs of those connectors and presto contact is made and we have for the ride home.

My paper clip was used for reading the early GM trouble codes. My leather-man is my tool of choice for squeezing those connectors. Form follows function. Cheers.

check the resister if fuse okay no power on blower motor passenger side fire wall in heater

nick

My '96 has the same trouble. It started this winter. After I figured out I could tap the heater casing inside the cab and the motor would start, I was pleased. Now it doesn't do any good to tap. I have checked the fuses and all. I believe it is the motor itself and am trying to find a guide on how to remove and replace it. The motor won't be expensive but I'm afraid the labor will be intensive. Anybody have any guidance?

Most Chevy heaters and also the Ford units I have seen make the fan motor removable from the engine side of the fire wall. Three screws and the power plug are the only connection.

Have you checked the motor relay? Located normally below the GB inside the cab?