Vintage AC and kicking on fans - The 1947 - Present Chevrolet & GMC Truck Message Board Network

weq92f · 07-16-2024, 03:50 PM

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My MSD Atomic EFI computer controls the fans based on temp settings. To get the A/C to trigger one of my fans, I ran a tap wire from the binary switch to the relay 12v trigger for the fan I wanted to kick on with A/C. Essentially I'm tapping into the compressor clutch 12v. Later, I did the same thing with a pusher fan placed on the condenser.

Since then I have installed a trinary switch for the purpose of having the supplemental pusher fan only kick when pressure limit is reached. Reminds me...I need to finish that up!

Hth,

-Kevin

07-16-2024, 03:50 PM	#13
weq92f Registered User Join Date: Oct 2016 Location: Dallas Texas Posts: 3,078	Re: Vintage AC and kicking on fans . My MSD Atomic EFI computer controls the fans based on temp settings. To get the A/C to trigger one of my fans, I ran a tap wire from the binary switch to the relay 12v trigger for the fan I wanted to kick on with A/C. Essentially I'm tapping into the compressor clutch 12v. Later, I did the same thing with a pusher fan placed on the condenser. Since then I have installed a trinary switch for the purpose of having the supplemental pusher fan only kick when pressure limit is reached. Reminds me...I need to finish that up! Hth, -Kevin __________________ 67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold



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