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1997 Chevy Silverado Heater/Airconditioning fan

Tiny
OMOORE
  • MEMBER
  • 1997 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 181,000 MILES
When problem started, the fan was running fine, however after a little while, it was like a damper would change and the air was going somewhere in the dash. Very little coming out of the vents. If you changed it from inside air to outside air and let it run for a little while and then switch it back it would blow strong again, for a little while. Then one day the fan would not come on at all. After I killed the engine, and recranked it, the fan motor starting running again. Now it has stopped all together. When you turn the switch to ON, you can hear the compressor come on, but the fan does not run. It may be a bad motor, but I can't help believe that the damper issue may be related some how to the blower motor issue.
I would appreciate any ideas you may have on this issue.
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Thursday, June 24th, 2010 AT 1:22 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi OMoore, Welcome to 2carpros and TY for the donation

Do this power the purple wire at the blower motor from the battery positive positive and black wire to negative post-did it come on, if so check and test the blower motor relay and blower motor resistor and the blower switch
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Thursday, June 24th, 2010 AT 5:44 PM
Tiny
OMOORE
  • MEMBER
  • 1 POST
Ok, I think I have two issues. I was actually at work when I posted my question. I got home and started looking. I found the connector of the purple wire on the motor, burnt and not making a good connection. Fixed that. Now the motor is working again, so the other issue is the fact that after running a while, the air will almost totally stops coming through the dash vents. You can hear what sounds like the damper has closed and the air is blowing against a dead head. Sometimes you can switch it to outside air for a few minutes and then back to recirculate and you can hear the damper open up and it'll be fine for a few minutes. Almost as if a vacuum problem is going on with the damper. (Don't know if thats how it works)
Thanks,
Owen
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Thursday, June 24th, 2010 AT 9:17 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Sounds like a problem with the vacuum actuator of the air blend door if not test the HVAC unit
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Thursday, June 24th, 2010 AT 11:41 PM

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