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Topic: Heater/AC Fan

in Forum: C3 Cooling and Heating Systems


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Heater/AC Fan (1/7)
 2/21/07 2:37am
JimGLifetime Member
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Gloucester, VA - USA

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1979 T-Top, Metallic Green ZZ4 350/355 hp 405 ft/lbs torque Dual Spal Fans 700R4 4 Spd O/D Transmission 2004 Z06 Commemorative Edition

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Fan works when set to AC but not on Heat/Defrost. 
 
Anyone got any thoughts on this one? I'm guessing the fan motor myself but I'm not sure how to trouble shoot it short of just buying a new one and putting it in.


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Heater/AC Fan (2/7)
 2/21/07 4:26am
DaveMLifetime Member
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Flanders, NJ - USA

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If it runs in AC then the motor works. The fan switch contols the motor it should not matter if it's in AC or heat. Maybe the control lever is shorting out something under the console? Just a guess.
Dave


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Heater/AC Fan (3/7)
 2/21/07 5:47am
gurtz
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baton rouge, LA - USA

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I agree with Dave, it sounds like the lever.  I changed one out - brand new from Eckler's and it did not work.  Got another one from them and it works now.  They have copper connector points on the back side and the lever can come loose/wobble at the pivot. 
 
At least that is what happened to me.  I am still not impressed with the part they sent in and that is the only negative thing I could say about them, but I might try another supplier if that is what you find is the problem.  That should be the problem.  Do you have different speeds at the A/C setting?
 
Rick
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Heater/AC Fan (4/7)
 2/21/07 8:59am
Adams' AppleLifetime Member
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Duncanville, TX - USA

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#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

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Yup...if the fan blows with A/C, then it is working. The problem is most likely to be the control switch/lever that changes the "modes"(A/C-heat-defog)
Like Rick I am curious to know if the fan has all speeds on the A/C setting...

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Heater/AC Fan (5/7)
 2/21/07 9:04am
JimGLifetime Member
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Gloucester, VA - USA

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I'll try it out when I get home this weekend... I don't remember.

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Heater/AC Fan (6/7)
 2/21/07 4:05pm
suncountryLifetime Member
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Moses Lake, WA - USA

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1976 L48 4-spd, Mahogany Metalic exterior, Buckskin interior 350ci/350hp, 3rd owner, fiberglass spring, 255/50-16's Torq-Thrust II

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If I remember right I have the same problem last year. I had to move between the heater and A/C selection to get it to work.
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Heater/AC Fan (7/7)
 2/23/07 5:09pm
gs77vet
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gurtz, I had the same problem with my ac/heater panel, but I had to replace six control panels before I got one that works, all from Eckler's. Eckler's did return to me $400.00 bucks for labor cost. It was a complete pain.
JimG, man it sounds like a wiring problem to me, I hope I'm wrong, good luck man, Gene
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