The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - fan wiring

cjohnson6772 · 07-28-2013, 08:28 PM

Just came back in the house and saw the last two responses. Thanks guys! I have connected the trinary straight to pin 85 for the secondary fan relay. I will likely add another relay or diode/resistor in the coming weeks, but I just needed to get something wired up to have my a/c guy charge it this week. To be honest I doubt that I should ever see the high pressure before both fans are running anyways. I'm running a 195 t-stat and the first fan kicks on at 200 and the second fan kicks on at 210. I figure I would see 210 before I would see high a/c pressure since my condenser is basically the same cross section as my radiator. Anyways, I would have never thought about wiring in the other resistor (I guess I don't really understand "pull up resistors"), but I will add it when I have more time to run the extra hot wire.

Thanks again guys.

07-28-2013, 08:28 PM	#7
cjohnson6772 Registered User Join Date: Dec 2010 Location: NC Posts: 666	Re: fan wiring - diode Just came back in the house and saw the last two responses. Thanks guys! I have connected the trinary straight to pin 85 for the secondary fan relay. I will likely add another relay or diode/resistor in the coming weeks, but I just needed to get something wired up to have my a/c guy charge it this week. To be honest I doubt that I should ever see the high pressure before both fans are running anyways. I'm running a 195 t-stat and the first fan kicks on at 200 and the second fan kicks on at 210. I figure I would see 210 before I would see high a/c pressure since my condenser is basically the same cross section as my radiator. Anyways, I would have never thought about wiring in the other resistor (I guess I don't really understand "pull up resistors"), but I will add it when I have more time to run the extra hot wire. Thanks again guys.