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Blower relay on non ac?

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Old 04-09-2010, 12:00 PM
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Car: 85 TA
Blower relay on non ac?

Did the factory non ac cars use a relay for the heater blower or is it run direct from the switch?
Guess I am wondering if I can eliminate the relay after ac delete conversion. I have the non ac wiring and doesn't appear to have used a relay.
Old 04-12-2010, 11:19 AM
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Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Relay Race

They ran it from the switch.

You can eliminate the relay however GM might have used a lower current rated speed switch for the HEATER ONLY models due to the fact the relay draws only a tiny fraction of the current, therefore you might burnout the switch.

Also, 16 AWG wire is used verses 14 AWG, therefore the hi speed might run a bit slower due to voltage drop.


Happy Racing!


I’ve NEVER Hit The Wall - (The Safer Barrier Prevented It)
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Old 04-27-2010, 07:47 AM
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Re: Relay Race

After closer inspection it looks to me like the relay only powers the blower at the HIGH switch position on AC models.
Old 04-27-2010, 08:02 AM
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Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Relay Race

This is true.

That’s where the max current draw is.


Happy Racing!



Make Noise, Turn Left, Repeat
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