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Old 12-05-2016, 12:54 AM   #9
72MARIO
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Join Date: Nov 2000
Location: Huntsville Ontario Canada
Posts: 4,051
Re: Heavy Towing: Electric fans or clutch fan?

I used the stock mechanical fan on my LQ4 swap just for reliability . Towing this summer tempatures reached 220 before the mechanical fan would engage on the hwy and 228 from a cold start sitting in traffic.

I am removing the mechanical fan and installing the grand Cherokee fan I had in previous with the old 327.

The reason I went mechanical is because I wanted cooling with ac on and electric fan off at road speed.I couldn't figure out how to accomplish this.

I have now set fan one on at 198 off at 190 and fan 2 on at 32 off at 320. I use the grounds to control 2 relays one for engine cooling fan and two for a/c I use the compressor clutch power to trigger the relay

I haven't driven it like this yet but I should work well.
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1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair
http://67-72chevytrucks.com/vboard/s...d.php?t=625017
1967 C/20 6.0/4L80 Roofing Truck
1990 V2500 Suburban "Plow Truck"
2005 TAHOE DD
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