wildchris

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!

I'm Batman

It sticks down into the A/C box from the top. Looks like a flat football with a wiring plug on top.

RunningMan373

'78s, I believe are slightly different, but this should give you a good idea, Pass side near fire wall:

wildchris

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.

Red 69

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.

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.

...Roger...

Fuse ?

txsugar08

Should I check the fuse?

txsugar08

it blows on low and med.

...Roger...

Yes the high blow has its own fuse. I'm pretty sure its under the brake master cylinder.

BHRIG

also check ground wire to blower motor......it should be a black wire separate from harness running from blower motor through firewall.
Good Luck

Peterbuilt

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.

RunningMan373

Ganey

The fuse in the fuse box runs low & medium.

Paul L

That's the one. Mine was badly corroded and needed replacing.

txsugar08

I found the orange wire on the left side near the M/C but there is no fuse.

txsugar08

Replaced the resistor and still nothing.

txsugar08

Also noticed that when the switch is in the off position the blower motor still blows very low. I have replaced the switch.

txsugar08

No orange wire.

RunningMan373

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.

designed that way. no CO.

it goes from the fuse, then into a wire harness over to the blower motor relay.