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Username Post: AC/Heater blower motor does not work on high        (Topic#357967)
Liberty Valance 
Contributor
Posts: 116
Liberty Valance
Loc: Euless,Texas
Reg: 07-21-14
09-08-19 06:46 AM - Post#2775040    

Had this issue the past few days The blower motor shuts off when switched to high. Works on all other speeds. With the help of a squarebody guy, issue resolved.

There is an orange 10 ga wire on motor relay that goes thru harness to firewall that has an inline fuse connected to the junction block. The fuse holder/fuse was burnt. Replaced fuse holder, now have the high speed on blower. This wire has a constant 12v.

Using AC lately has been bearable in our Texas heat. I could use the bi-level setting and the medium 2 fan speed.

There may be some here that has had this issue and there may be others that this could help.



1974 Cheyenne 10 LWB 350/TH350/AC/4 BBL Quadrajet
Mopar by Birth
Chevy by Choice


 
gchemist 
Senior Chevytalk Moderator
Posts: 24932
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
09-09-19 06:10 AM - Post#2775121    
    In response to Liberty Valance

Nice work. The resistor reduces power for all lower settings. Including the off position which still turns the fan to circulate air. Another reason to bypass the heater core during the summer!! The very low speeds pushes hot air through the cab. At high, full 12V go to the fan. Check the ground too. Make sure it has a good contact. Even better is to run the ground to a bracket bolt close to the alternator.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
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