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Topic: Blower Motor Wiring

in Forum: C3 Electrical

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Blower Motor Wiring (1/4)
5/27/13 9:19am

teklein
Former Member
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Woodruff, SC - USA

Vette(s):
1972 Stingray Convertible - base

Joined: 3/6/2013
Posts: 7

Hey,

I have recently gotten the AC compressor to turn on (and the lines get cold!) but the blower motor will not work.

On the passenger side blower motor relay I get 12v to the orange wire. With the blower switch in any position I get -0.00 on the voltmeter for the purple wire. From what I have read the purple wire is what supplies power directly to the motor - it does actually connect from the relay to the blower motor.

Given that the purple wire does not receive power, is it safe to assume I should replace the blower relay before continuing?

I can get pictures of the wiring I am currently working with (someone unqualified was definitely in there).

Thanks!

Tim Klein

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Re: Blower Motor Wiring (2/4)
5/27/13 10:15am

rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1171

If I have the colors right

At relay

Black: ground grounded at blower Motor

Dark Blue: power when fan switch in High to energize relay

Orange: Power all the time from high speed blower fuse powers blower when relay energized

Purple: one goes to blower motor, other comes through resistor block (top of evap box) from fan switch in Lo Med1 Med2

You need to check the lack of power on the purple wire check heater ac fuse, check for power at resistor block then go to fan sw.

|UPDATED|5/27/2013 10:15:58 AM (AZT)|/UPDATED|

Re: Blower Motor Wiring (3/4)
5/27/13 7:59pm

Adams' Apple

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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 20207

The high speed fan relay ONLY works the Hi speed of the blower. You could take that relay off the car, and you should still have the lo, lo/med, and med/hi fan speeds....unless you have no power AT the fan switch itself....that's where I would start, if the fan does not run on ANY speed.
It's possible that the relay AND the blower resistor are both messed up....but that's a long shot. I would still check for correct voltage AT the fan switch and go from there. Thumbs Up

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Re: Blower Motor Wiring (4/4)
5/28/13 10:12am

teklein
Former Member
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Woodruff, SC - USA

Vette(s):
1972 Stingray Convertible - base

Joined: 3/6/2013
Posts: 7

Awesome guys! The wire colors helped a ton.

Ill check the heater switch this weekend and see what I find Wink

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