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Topic: AC fan problem

in Forum: C3 Cooling and Heating Systems

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AC fan problem (10/20)
7/12/06 11:21am

gs77vet
Former Member
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Joined: 3/19/2005
Posts: 385

Hey Warbird, I had the same problem with my 77 vette, check your fuses, high speed runs off of a different fuse. Mine is a 25 amp. I installed a bus breaker, (part number CBF 25 at NAPA). My fuse is located in the fuse box at the very top, it's a mother to get to for me because I am 6'4" so I find a smaller person or a very limber person to get to it. good luck, Gene

gs77vet38910.3493634259

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AC fan problem (11/20)
7/12/06 11:27am

warbird
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Roseland, NJ - USA

Vette(s):
1974, 454 with 4 on the floor, matching numbers.

Joined: 12/4/2003
Posts: 966

Thanks Gene, I'm not as tall as you but, my eating habits make it hard to reach certain places.

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AC fan problem (12/20)
7/22/06 10:54pm

kstyer

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CUYAHOGA FALLS, OH - USA

Vette(s):
1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!

Joined: 12/2/2003
Posts: 6424

Some of our cars have a hot lead directly from a fusiable link to the high position on the blower relay. Some are fused or use a circit breaker. If you have a high speed blower relay, the relay uses the switch to control the lower speeds through the resistor block, and uses a separate power supply to the relay to supply direct power through the relay to the blower motor for high speed. In this case the high speed switch on the dash supplies power to trigger the relay when you select high blower.kstyer38920.8302430556

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AC fan problem (13/20)
8/22/06 4:56pm

2 cruzn

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Poquoson, VA - USA

Vette(s):
73 Conv, Blue-Green/White Top - 454, M21 - Dark Saddle Leather, Power Windows, A/C, Tilt/Tele, AM/FM St. (orig. and sounds like it too).#2 -- 2007 Coupe,3 LT package, Z51 option, Victory Red, Ebony Int. Clear Top.

Joined: 11/20/2004
Posts: 1023

[QUOTE=annicorvette]Do you have a rear defrost ? if you do check this--in my 78 the fan is wired so the high speed fan is disabled if the rear defrost is on. Don't ask why i just know it is.[/QUOTE]

Is it possible they use the same circuit and if both are on high the AMP draw would be too high?

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AC fan problem (14/20)
8/22/06 8:05pm

Adams' Apple

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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 20128

More than likely.

It should be noted tho, that on the '74(and earlier cars, up to '77), the rear defrogger was simply an extra blower fan that blew on the rear winder. The later cars('78-82) wid da large rear winder had imbedded defrogger circuits in the glass.

The 'lectric defroggers take quite a bit-o-'lectristity, which is why they are almost always on a timer.

Adams' Apple38951.7151273148

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AC fan problem (15/20)
9/1/06 5:22pm

LeeW78
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LAKE KATRINE, NY - USA

Vette(s):
1978 Black-Silver T-Top

Joined: 8/29/2006
Posts: 19

I have just the reverse problem. The high speed works but the lower setting do nothing. Any suggestions?

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AC fan problem (16/20)
9/1/06 11:01pm

Adams' Apple

That could be the blower switch, or the resistor bad. It could also simply be a fuse.
On most cars, the high speed blower is on a completely different circuit. This is why most of the time, it is the high speed that doesn't work, but the low speeds do. But, the other way happens also. I would start by checking fuses, and then the switch.

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AC fan problem (17/20)
9/12/06 11:59am

gs77vet
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Joined: 3/19/2005
Posts: 385

Hey Lee, AA is right, different fan speed, different fuse. Just one of the small things that makes owning one of these beauty's fun, Huh. Gene

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AC fan problem (18/20)
1/2/07 12:01am

warbird
Former Member
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Roseland, NJ - USA

Vette(s):
1974, 454 with 4 on the floor, matching numbers.

Joined: 12/4/2003
Posts: 966

It works !

I had the car out for a ride the other day, started to play around with the A/C Heater controllers and everything works Confused

. I've gone crazy trying to figure this problem out, and low and behold, it's working Wits%20End

Hey, at least it's working, now if it will work in the summer is another question.

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AC fan problem (19/20)
1/2/07 11:39pm

Adams' Apple

Now...you know the first time you need that high speed blower with the A/C on, it ain't gonna work!!

Sounds like you may just have a bad connection somewhere, or one of the micro-switches in the control unit(thumbwheels). Hey, as long as it works, eh?

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AC fan problem (20/20)
1/3/07 12:03am

warbird
Former Member
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Roseland, NJ - USA

Vette(s):
1974, 454 with 4 on the floor, matching numbers.

Joined: 12/4/2003
Posts: 966

I have no idea how it got fixed. Confused

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