Heater Blower will not stop running??

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Aug 17, 2010 | 08:54 AM

604

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From: KY

Heater Blower will not stop running??

I have been trying to figure this out on my 78 vet and have had no luck. Have searched and just can't seem to find anything on this. With the selector in the off position the blower continues to run at a very slow speed. I have tried unhooking the selector (vet, ac, heat) and the blower continues to run at the slow speed. The speed selector works fine and works on all speed selections. So I would think the resistor is fine. You can have the selector on say vent and the speed on high, when you select off the blower will drop down to the very slow speed. I would think it might be a contactor some were that is stuck but not sure were to look. I am really scratching my head on this one. If any one else has had tis problem some ideas would be greatly appreciated!!!

Aug 17, 2010 | 09:13 AM

Seasoned80

Instructor

Joined: Jul 2003

Posts: 168

Likes: 1

From: Augusta GA

It is supposed to run at all times.

Aug 17, 2010 | 09:18 AM

thegazman

Drifting

Joined: Apr 2008

Posts: 1,305

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From: Lewisburg WV

thegazman

That's the way GM designed it. My 79 is the same way. It should turn off with the key in the off position. Don't tear into it looking for a problem.

Aug 17, 2010 | 09:41 AM

hammadown

Burning Brakes

Joined: May 2007

Posts: 1,108

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From: No Prov RI

Check out this link...............

http://home.comcast.net/~chadwick.ro...entilation.htm

about 3/4's of the way down read the section "fan always runs".........
this should help with your problem

Hammadown

Aug 17, 2010 | 09:49 AM

604

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From: KY

Thanks!
I never would have thought that it ran all the time! I think I might do that trick and diconect the slow speed.
Thanks to all for the help!!!!

Aug 17, 2010 | 09:55 AM

7T1vette

Team Owner

Joined: Jan 2006

Posts: 37,637

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From: Crossville TN

All it's designed to do is to guarantee some fresh air flowing through the car at all times. If your problem is that the blower is 'noisy', fix the blower.

Aug 17, 2010 | 10:06 AM

604

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From: KY

Not noisy,
Just of all the cars I have owned I have never had one that had the blower run non stop. Never herd of sutch a thing, as this is my first vet.

Aug 17, 2010 | 10:15 AM

lars

Tech Contributor

Joined: Aug 1999

Posts: 14,382

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From: At my Bar drinking and wrenching in Lafayette Colorado

GM started doing that in 1975 following lawsuits for carbon monoxide poisoning in GM cars - it's a safety feature that you should not disable. Leave the fan alone - it needs to run to keep exhaust gas out of the cabin.

Lars

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Aug 17, 2010 | 03:29 PM

speedreed8

Melting Slicks

Joined: Oct 2006

Posts: 2,417

Likes: 336

From: Texas

the brown wire in the diagram, upper left side of drawing. is the jumper around the switch that keeps it running, i've seen mine when i had the console apart. and wondered why it was jumpered. and figured it out a few years ago. left mine alone, since it was oem.

http://www.corvetteforum.net/c3/tune.../index16.shtml