ac/heater blower problem
Team Owner
Joined: Jan 2003
Posts: 20,322
Likes: 248
From: Summerland B.C. Canada
Good chance it's the blower resistors on top of evap housing.
Diagnostics from my 86 FSM
http://members.shaw.ca/dankai/HVAC%20Electrical.pdf
Diagnostics from my 86 FSM
http://members.shaw.ca/dankai/HVAC%20Electrical.pdf
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
I believe there's a relay that bypasses all the resistors when you go to the HIGH fan setting. It sounds like that circuit isn't working the way it ought to.
I had a '78 Corvette that had the symptoms you describe. One of the resistors was broken.
I had a '78 Corvette that had the symptoms you describe. One of the resistors was broken.
Racer
Joined: Sep 2007
Posts: 493
Likes: 0
From: Eden Utah
I could check my FSM but if my memory is still with me i don't believe there are any resistor on high. The way to check the fan on high is to use a jumper wire from the battery and if it does not blow hard, then it is likely the fan motor...
