1986 Corvette Fan Controls
Thread Starter
Racer
Joined: Aug 2009
Posts: 496
Likes: 4
From: Cordova TN
1986 Corvette Fan Controls
Hello all. Long time no see. Using some free time to get some things done to our 86. First thing was to change the radiator to a Dewitt’s along with the fan. Ours has the B4P additional push fan in the front and I had replaced the temp sensor in the head years ago for it to come on around 195. So I’m digging through posts and if I’m right the main fan is turned on by either the ecm at a ridiculously high temp or by AC pressure switch when the AC is on??
my problem is the AC isn’t running and I’d rather not get into that right now. I’d switched from r12 to freeze 12 a decade ago but evidently freeze 12 is now banned as well. If there is a replacement that I won’t have to pull the compressor, flush lines and change orrifice tube/dryer let me know.
mom, back to my original question. Is it possible to cut the wire from the ecm at the main fan relay and hook it to the aux fan temp switch in the head so that both fans would come on at 195? If the ecm is just sending a closed circuit to the relay to start the fan I don’t see why it wouldn’t work.
thanks and fun to be back reading through the forum.
my problem is the AC isn’t running and I’d rather not get into that right now. I’d switched from r12 to freeze 12 a decade ago but evidently freeze 12 is now banned as well. If there is a replacement that I won’t have to pull the compressor, flush lines and change orrifice tube/dryer let me know.
mom, back to my original question. Is it possible to cut the wire from the ecm at the main fan relay and hook it to the aux fan temp switch in the head so that both fans would come on at 195? If the ecm is just sending a closed circuit to the relay to start the fan I don’t see why it wouldn’t work.
thanks and fun to be back reading through the forum.
Drifting
Joined: Mar 2006
Posts: 1,263
Likes: 188
From: Wabasha Mn
Hello all. Long time no see. Using some free time to get some things done to our 86. First thing was to change the radiator to a Dewitt’s along with the fan. Ours has the B4P additional push fan in the front and I had replaced the temp sensor in the head years ago for it to come on around 195. So I’m digging through posts and if I’m right the main fan is turned on by either the ecm at a ridiculously high temp or by AC pressure switch when the AC is on??
my problem is the AC isn’t running and I’d rather not get into that right now. I’d switched from r12 to freeze 12 a decade ago but evidently freeze 12 is now banned as well. If there is a replacement that I won’t have to pull the compressor, flush lines and change orrifice tube/dryer let me know.
mom, back to my original question. Is it possible to cut the wire from the ecm at the main fan relay and hook it to the aux fan temp switch in the head so that both fans would come on at 195? If the ecm is just sending a closed circuit to the relay to start the fan I don’t see why it wouldn’t work.
thanks and fun to be back reading through the forum.
my problem is the AC isn’t running and I’d rather not get into that right now. I’d switched from r12 to freeze 12 a decade ago but evidently freeze 12 is now banned as well. If there is a replacement that I won’t have to pull the compressor, flush lines and change orrifice tube/dryer let me know.
mom, back to my original question. Is it possible to cut the wire from the ecm at the main fan relay and hook it to the aux fan temp switch in the head so that both fans would come on at 195? If the ecm is just sending a closed circuit to the relay to start the fan I don’t see why it wouldn’t work.
thanks and fun to be back reading through the forum.
Team Owner
Joined: Sep 2001
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Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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I think that would work yes.
The ECM grounds the relay connection at 228F, so you just run a wire to a switch at the relay or wire it together with the Pusher fan's temp switch in the head.
The ECM grounds the relay connection at 228F, so you just run a wire to a switch at the relay or wire it together with the Pusher fan's temp switch in the head.
Thread Starter
Racer
Joined: Aug 2009
Posts: 496
Likes: 4
From: Cordova TN
thanks
