Blower motor relay mod? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1985-GMC · 11-06-2015, 01:18 AM

Has anyone done one yet for our squares? Here's a write-up on the 1st gen dodge trucks, I'd like to do something similar to this with my trucks but it would make my life a whole lot easier if someone else did a how-to on it lol. I'm sure I could eventually figure it out but I'd really like to keep the head scratching to a minimum.

http://www.dieseltruckresource.com/f...-motor-158400/

Liberty · 11-06-2015, 08:44 AM

Mine blows a lot better after I replaced the failing blower motor and repaired some vacuum leaks. This does seem like an interesting project however! I wonder how much of a difference that would make on our trucks.

1985-GMC · 11-06-2015, 10:15 AM

Yeah I've done all that too and the 90s motor (seems like the same motor to me) but it still doesn't blow hard enough. I want to swap to the metal fan also. Those guys say it feels like it blows two to three times harder afterwards.

ray_mcavoy · 11-06-2015, 08:34 PM

Does your truck have A/C or is it heat-only?

If it has A/C, there should already be a factory relay for the high blower speed.

1985-GMC · 11-07-2015, 12:58 AM

Yes it has A/C and there is a relay on the side of the evaporator box. Maybe just up-ing the gauge of wire to and from the relay would do the same thing. I need to read that article again.

11-06-2015, 01:18 AM	#1
1985-GMC Chevy Enthusiast Join Date: Jul 2009 Location: Canyon Lake Texas Posts: 2,024	Blower motor relay mod? Has anyone done one yet for our squares? Here's a write-up on the 1st gen dodge trucks, I'd like to do something similar to this with my trucks but it would make my life a whole lot easier if someone else did a how-to on it lol. I'm sure I could eventually figure it out but I'd really like to keep the head scratching to a minimum. http://www.dieseltruckresource.com/f...-motor-158400/ __________________ Tony 1985 GMC K2500 restoration Project: Rust, White & Blue 1989 Chevy R3500 CC Cummins & 4X4 swap some day... 1989 Burb (D60, 14BFF, 12V, NV4500, NP205, 37" tires in progress)

11-06-2015, 08:44 AM	#2
Liberty Registered User Join Date: Feb 2015 Location: Bonham, Texas Posts: 241	Re: Blower motor relay mod? Mine blows a lot better after I replaced the failing blower motor and repaired some vacuum leaks. This does seem like an interesting project however! I wonder how much of a difference that would make on our trucks.

11-06-2015, 10:15 AM	#3
1985-GMC Chevy Enthusiast Join Date: Jul 2009 Location: Canyon Lake Texas Posts: 2,024	Re: Blower motor relay mod? Yeah I've done all that too and the 90s motor (seems like the same motor to me) but it still doesn't blow hard enough. I want to swap to the metal fan also. Those guys say it feels like it blows two to three times harder afterwards. __________________ Tony 1985 GMC K2500 restoration Project: Rust, White & Blue 1989 Chevy R3500 CC Cummins & 4X4 swap some day... 1989 Burb (D60, 14BFF, 12V, NV4500, NP205, 37" tires in progress)

11-06-2015, 08:34 PM	#4
ray_mcavoy Registered User Join Date: Nov 2009 Location: Sherman, ME Posts: 2,366	Re: Blower motor relay mod? Does your truck have A/C or is it heat-only? If it has A/C, there should already be a factory relay for the high blower speed.

11-07-2015, 12:58 AM	#5
1985-GMC Chevy Enthusiast Join Date: Jul 2009 Location: Canyon Lake Texas Posts: 2,024	Re: Blower motor relay mod? Yes it has A/C and there is a relay on the side of the evaporator box. Maybe just up-ing the gauge of wire to and from the relay would do the same thing. I need to read that article again. __________________ Tony 1985 GMC K2500 restoration Project: Rust, White & Blue 1989 Chevy R3500 CC Cummins & 4X4 swap some day... 1989 Burb (D60, 14BFF, 12V, NV4500, NP205, 37" tires in progress)



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