Need quick help identifying electric fan. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jorgensensc · 03-12-2013, 04:54 PM

Sorry for the dire sound, but I found an electric fan on Craigslist for 50.00. Guy says it is a 2 speed mark7 fan. Pulled it out of a 97 Lincoln. I'm confused because it has a white plug and 3 wires, red, blue, black. I thought all the two speeds had 4 wires and a black connector. Should I buy this or not? Is it the right 2 speed fan? I need a high and low since I have ac. I've read some used variable voltage to control the fan, is this one of those? Im suppose to go get it in 2 hours. Thanks for the last minute help!
Shawn
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jorgensensc · 03-12-2013, 04:57 PM

Pic of the fan.

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Sammy · 03-12-2013, 08:23 PM

If it actually came out of a 97 Lincoln it would be a two speed fan because of the AC and only one fan. Like you I would have figured another wire unless the Lincoln has a relay that kicks in causing the higher speed when the air is on.

jorgensensc · 03-12-2013, 08:32 PM

Thanks for the input guys! I went and checked it out. It is a variable speed fan. Won't work for me without a controller, which I don't want to buy if my ls computer will control a 2 speed fan.

So this is what I figured out about mark VIII fans:

White plug with inspection port----single speed
White plug without inspection port---- variable speed
Black plug---------2 speed

Hope this helps out somebody else.
Shawn
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Sammy · 03-12-2013, 08:33 PM

Just looked at a close up pic of a push pull fan on Jegs. It has only two wires into the fan and it is a single speed fan. So the three wires would give you a high output lead, low, and a ground. Sounds like that is what you are looking for.

jorgensensc · 03-12-2013, 08:36 PM

Not quite Sammy. That's what I thought. For some reason there is a third wire that terminates inside the wiring harness and doesn't actually go to anything on some single speed fans. Goofy right?
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Sammy · 03-13-2013, 08:38 AM

Agreed logic doesn't work here. hmm. Maybe on the Lincoln they had too many 2 wire connection plugs n decided to make it idiot proof then.

03-12-2013, 04:54 PM	#1
jorgensensc Registered User Join Date: Jul 2003 Location: Cypress, Tx Posts: 4,005	Need quick help identifying electric fan. Sorry for the dire sound, but I found an electric fan on Craigslist for 50.00. Guy says it is a 2 speed mark7 fan. Pulled it out of a 97 Lincoln. I'm confused because it has a white plug and 3 wires, red, blue, black. I thought all the two speeds had 4 wires and a black connector. Should I buy this or not? Is it the right 2 speed fan? I need a high and low since I have ac. I've read some used variable voltage to control the fan, is this one of those? Im suppose to go get it in 2 hours. Thanks for the last minute help! Shawn Posted via Mobile Device __________________ 1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE

03-12-2013, 04:57 PM	#2
jorgensensc Registered User Join Date: Jul 2003 Location: Cypress, Tx Posts: 4,005	Re: Need quick help identifying electric fan. Pic of the fan. Posted via Mobile Device Posted via Mobile Device Posted via Mobile Device Attached Images __________________ 1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE

03-12-2013, 08:23 PM	#3
Sammy Registered User Join Date: Apr 2000 Location: Bonne Terre, Mo Posts: 3,005	Re: Need quick help identifying electric fan. If it actually came out of a 97 Lincoln it would be a two speed fan because of the AC and only one fan. Like you I would have figured another wire unless the Lincoln has a relay that kicks in causing the higher speed when the air is on. __________________ '69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"

03-12-2013, 08:32 PM	#4
jorgensensc Registered User Join Date: Jul 2003 Location: Cypress, Tx Posts: 4,005	Re: Need quick help identifying electric fan. Thanks for the input guys! I went and checked it out. It is a variable speed fan. Won't work for me without a controller, which I don't want to buy if my ls computer will control a 2 speed fan. So this is what I figured out about mark VIII fans: White plug with inspection port----single speed White plug without inspection port---- variable speed Black plug---------2 speed Hope this helps out somebody else. Shawn Posted via Mobile Device __________________ 1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE

03-12-2013, 08:33 PM	#5
Sammy Registered User Join Date: Apr 2000 Location: Bonne Terre, Mo Posts: 3,005	Re: Need quick help identifying electric fan. Just looked at a close up pic of a push pull fan on Jegs. It has only two wires into the fan and it is a single speed fan. So the three wires would give you a high output lead, low, and a ground. Sounds like that is what you are looking for. __________________ '69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"

03-12-2013, 08:36 PM	#6
jorgensensc Registered User Join Date: Jul 2003 Location: Cypress, Tx Posts: 4,005	Re: Need quick help identifying electric fan. Not quite Sammy. That's what I thought. For some reason there is a third wire that terminates inside the wiring harness and doesn't actually go to anything on some single speed fans. Goofy right? Posted via Mobile Device __________________ 1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE

03-13-2013, 08:38 AM	#7
Sammy Registered User Join Date: Apr 2000 Location: Bonne Terre, Mo Posts: 3,005	Re: Need quick help identifying electric fan. Agreed logic doesn't work here. hmm. Maybe on the Lincoln they had too many 2 wire connection plugs n decided to make it idiot proof then. __________________ '69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"



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