2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

A/C Fan Speed Broken

Thread Tools
 
Search this Thread
 
Old Aug 21, 2008 | 09:24 PM
  #1  
87bucket's Avatar
Thread Starter
Full Member
Tenured Member 10 Years
 
Joined: Sep 2005
Posts: 104
Likes: 0
From: Newton, KS
A/C Fan Speed Broken

since i bought my car, i noticed that the a/c and heater control unit only blows out at one speed. the speed adjustment doesn't work. I bought a brand knew logicon control unit, and after putting it in it still blows only one speed. please any help on how to fix this would be appreciated.
Reply
Old Aug 23, 2008 | 03:30 PM
  #2  
JM1FD's Avatar
Senior Member
Tenured Member 20 Years
iTrader: (1)
 
Joined: May 2002
Posts: 705
Likes: 0
From: Houston, TX
Originally Posted by 87bucket
since i bought my car, i noticed that the a/c and heater control unit only blows out at one speed. the speed adjustment doesn't work. I bought a brand knew logicon control unit, and after putting it in it still blows only one speed. please any help on how to fix this would be appreciated.
Going from memory: There's a power transistor on a heatsink in the ductwork somewhere near the blower motor that gets a signal from the logicon. The transistor is actually what modulates the power to the blower motor for any speed other than high. High speed is controlled by a relay mounted in the same area. I'm thinking your power transistor has died, and it is defaulting to high.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
yetter227
2nd Generation Specific (1986-1992)
20
Sep 5, 2015 11:57 PM
immanuel__7
2nd Generation Specific (1986-1992)
89
Sep 5, 2015 10:23 AM
rotor_veux
2nd Generation Specific (1986-1992)
5
Sep 3, 2015 07:10 PM




All times are GMT -5. The time now is 01:02 AM.