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blower motor resistor?

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Old May 13, 2008 | 06:04 PM
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Default blower motor resistor?
Where is the blower motor resistor located in a 78 L82 4spd w/ac? If anyone has this information could you please help? Thanks in advance!
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Old May 13, 2008 | 06:30 PM
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It sticks down into the A/C box from the top. Looks like a flat football with a wiring plug on top.
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Old May 13, 2008 | 10:17 PM
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'78s, I believe are slightly different, but this should give you a good idea, Pass side near fire wall:

Name: BlowerMotor001.jpg Views: 5129 Size: 122.5 KB
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Old May 14, 2008 | 07:45 PM
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Thanks guys! I believe this may be my problem ( no control of blower ) , had the same problem on my wifes 04 trailblazer and that was it. I would hate to tear all that **** apart. I never use the ac or the heat for that matter, don't need the blower randomly turning on though. I will let you know when I tinker with it.
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Old May 15, 2008 | 02:20 PM
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My 79 fan only worked on Hi-speed, the relay turned out to be bad. Another thing you might check, and it is located just above the resistor in the picture posted, but in my 79.
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Old Jul 5, 2009 | 05:38 PM
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Default blower motor resistor
On my 76 when I turn the AC to the highest setting, the blower stops. I have replaced the relay I have checked the blower motor resistor and dont know what the hell Im looking at. Any ideas on why the blower stop when turned to high.
Last edited by txsugar08; Jul 5, 2009 at 05:41 PM.
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Old Jul 5, 2009 | 05:44 PM
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Originally Posted by txsugar08
On my 76 when I turn the AC to the highest setting, the blower stops. I have replaced the relay I have checked the blower motor resistor and dont know what the hell Im looking at. Any ideas on why the blower stop when turned to high.
Fuse ?
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Old Jul 5, 2009 | 07:00 PM
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Should I check the fuse?
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Old Jul 5, 2009 | 07:01 PM
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it blows on low and med.
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Old Jul 5, 2009 | 09:02 PM
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Originally Posted by txsugar08
Should I check the fuse?
Yes the high blow has its own fuse. I'm pretty sure its under the brake master cylinder.
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Old Jul 5, 2009 | 10:45 PM
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also check ground wire to blower motor......it should be a black wire separate from harness running from blower motor through firewall.
Good Luck
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Old Jul 6, 2009 | 02:45 AM
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Trust DWncchs, you will find a 30 amp in line fuse on an orange line someware on the left fender near the M/C. PG.
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Old Jul 6, 2009 | 02:57 AM
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Name: BlowerMotor003.jpg Views: 4035 Size: 92.8 KB
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Old Jul 6, 2009 | 07:09 AM
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Originally Posted by txsugar08
it blows on low and med.
The fuse in the fuse box runs low & medium.
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Old Jul 6, 2009 | 08:16 AM
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That's the one. Mine was badly corroded and needed replacing.

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Old Jul 6, 2009 | 03:34 PM
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I found the orange wire on the left side near the M/C but there is no fuse.
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Old Jul 6, 2009 | 03:55 PM
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Replaced the resistor and still nothing.
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Old Jul 6, 2009 | 04:48 PM
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Also noticed that when the switch is in the off position the blower motor still blows very low. I have replaced the switch.
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Old Jul 6, 2009 | 04:50 PM
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No orange wire.
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Old Jul 6, 2009 | 05:49 PM
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Originally Posted by txsugar08
I found the orange wire on the left side near the M/C but there is no fuse.
It's gotta be there,, but if i remember, the power take off point was moved on later years, don't know where to though. Best way to look for it is to find the power block, it's just a small metal screw down, directly (1/2") under the horn relay. It comes off red, goes to fuse, goes out org. Wires coming off of there go several places, on of them goes to the fuse. if it's not there, post your year and and question for it's location on forum.

Originally Posted by txsugar08
Also noticed that when the switch is in the off position the blower motor still blows very low. I have replaced the switch.
designed that way. no CO.

Originally Posted by txsugar08
No orange wire.
it goes from the fuse, then into a wire harness over to the blower motor relay.
Last edited by RunningMan373; Jul 6, 2009 at 05:51 PM.
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