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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Feb 2006 Posts: 150 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 150 | I'm installing A/C in my 54 3100. The engine cooling is being done via an electric fan which is wired via a relay and is controlled by a single wire coolant sensor switch. I have also added an manual override switch to that configuration.
I know I can wire the A/C compressor via "yet another relay" to also operate the engine cooling fan as required for the A/C.
I have heard that you can "with one wire" control the fan by splicing the compressor wire to the engine cooling sensor switch. This wire, I think has a diode in it. Can this be done? Pros/Cons?
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