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Topic: AC/Heater Relay

in Forum: C3 Cooling and Heating Systems


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AC/Heater Relay

Posted: 9/30/05 8:33am Message 1 of 8
ladyvette72
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Suffolk, VA - USA
Joined: 7/26/2005
Posts: 59
Vette(s): 1972 Convertible, A/C, with matching numbers. Sunflower yellow.

I have a 72 vette. Was trying to figure out where the AC/heater relay is located in the car.....Help!!!

Thanks




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AC/Heater Relay

Posted: 9/30/05 8:53am Message 2 of 8
greypoupon69
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Irving, TX - USA
Joined: 8/21/2004
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Vette(s): #1 -1969 Corvette Coupe Riverside Gold, black interior,MN,A/C,350/350,PS,PB,window cranks. #2 -2000 C5, black/black, 6 sp, Bose system & lots of buttons.
I have a '69 and my AC Relay was under the dash, so that was not so fun, but interesting. Looked like a box with 3-4 prongs to hook up to the electrical wires.

Hello, any '72's out there???


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AC/Heater Relay

Posted: 9/30/05 7:32pm Message 3 of 8
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
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
What kind of problem are you having? Does the blower (fan) not blow on "high", or does the A/C compressor not "kick in"?
There are different relays for each of these components.

The high blower relay is under the hood, on the side of the evaporator core "box", but the compressor relay(if so equipped) would be behind the dash Adams' Apple38625.818287037


Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

AC/Heater Relay

Posted: 10/1/05 6:55am Message 4 of 8
zzzs
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Joined: 9/21/2003
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Vette(s): 1978 Corvette
 Found IT.  It was a check valve.  The first one. It was cloged.  A $ 10.00 part from Mid America and a couble of small hose clamps replaced.  Lights and AC, heater, defrost now works. I was trying to make it more difficult.  Thanks ZZZS


AC/Heater Relay

Posted: 10/3/05 9:36pm Message 5 of 8
ladyvette72
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Suffolk, VA - USA
Joined: 7/26/2005
Posts: 59
Vette(s): 1972 Convertible, A/C, with matching numbers. Sunflower yellow.

This is the problem I'm having.... when I have the ignition turned but not started air is coming for the ducts but I don't have the ac/heater switch on.  It sounds like grumbling coming from the right hand dash and the compressor area with the hood rasied.  I thought maybe the switch or relay maybe bad?????




AC/Heater Relay

Posted: 10/4/05 4:59am Message 6 of 8
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
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
The blower running at low speed is normal on A/C cars. It is part of the ventilation system. If it's making a noise, there is a problem with the blower motor itself. You may need a new blower mtr., or it may have some junk(leaves, etc.) in it that is causing the noise.


Joel Adams
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AC/Heater Relay

Posted: 10/4/05 5:31am Message 7 of 8
knotacare
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Newark, DE - USA
Joined: 7/26/2004
Posts: 468
Vette(s): 1968 Conv, 454HO,500HP-600TQ, TKO-600,3:70 HD rear,hotrod air, custom paint & suspension,1973 Ruby Red,T-top, 383 Stroker, TK)-500,frame off restro, 1967 Dodge Coronet, 340 stroker to 406, Dana 60

If it's making noise it's probably the blower motor , if the noise changes or goes away when you increase the fan speed..the motor is probably bad. I've changed lots of blower motors in 70's GM vehicles. They have a little cooling tube that isn't enough so they heat up & the bearings go bad. You can change it from the engine compartment...it's a fairly simple job. You could also have so leaves etc caught in the squirrl cage...it happens over time

Good Luck,

Alan

 

Alan 




                                               

AC/Heater Relay

Posted: 10/4/05 8:47am Message 8 of 8
ladyvette72
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Suffolk, VA - USA
Joined: 7/26/2005
Posts: 59
Vette(s): 1972 Convertible, A/C, with matching numbers. Sunflower yellow.
Thanks guys for the info ..... i'll probably change out the motor soon


in Forum: C3 Cooling and Heating Systems


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