AC and fan questions.....HELP
Thread Starter
Racer
Joined: Apr 2007
Posts: 336
Likes: 0
From: Bruce WI
AC and fan questions.....HELP
First, I only have high or off with the fan. Is there a relay or fuse for the lower speeds? This is all the time, not just with ac on
Second, can a guy get a can of R-12 anywhere anymore??
Any help with either would be greatly appreciated!!
Second, can a guy get a can of R-12 anywhere anymore??
Any help with either would be greatly appreciated!!
Le Mans Master
Joined: Oct 2008
Posts: 9,758
Likes: 49
From: Houston Texas
IDK about the R-12 but it sounds like the blower control module is out.
Pro
Joined: Oct 2012
Posts: 613
Likes: 3
Or you could get your certification online for about 25.00 and be able to walk into any supplier and get in 30 pound size bottles of R12. Pricey but worth it since if you are going to do your own a/c work keep it simple and stay with r12.
Try and get dupont r12.
As for the speeds chances are depending on year/model it's the blower motor resistor.
Safety Car
Joined: Sep 2004
Posts: 3,953
Likes: 550
From: Mission Viejo CA
I'm confused. What year 'vette? Might it be an '86? The tat says otherwise!
Yes, problem could be the resistor, but not likely since all 3 lower speeds don't work. Most likely the speed control relay, that's located below the fan motor (passenger side f'wall). Look for overheated wires on the connector. There's an aluminum rivet in the relay that carries a lot of current that gets hot.
Yes, problem could be the resistor, but not likely since all 3 lower speeds don't work. Most likely the speed control relay, that's located below the fan motor (passenger side f'wall). Look for overheated wires on the connector. There's an aluminum rivet in the relay that carries a lot of current that gets hot.
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 207
From: Orlando FL
Sounds to me it's probably a C60.
If it is, I would probably check the (assuming that it has one) resistor network in the evaporator box. Also pay close attention and look for any broken wires or corroded/burnt terminal connections.
Sounds like a ground return opened up and there is no voltage drop on the divider network and the blower mower is getting full 12 volts.
If it is, I would probably check the (assuming that it has one) resistor network in the evaporator box. Also pay close attention and look for any broken wires or corroded/burnt terminal connections.
Sounds like a ground return opened up and there is no voltage drop on the divider network and the blower mower is getting full 12 volts.
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Thread Starter
Racer
Joined: Apr 2007
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From: Bruce WI
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
Hi, I'm not sure about 86, I have an 85 and mine is on the top of the heater box. It should be within the pathway of airflow before the air gets to the heater core or evaporator. Somewhere in the heater box.
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
Safety Car
Joined: Sep 2004
Posts: 3,953
Likes: 550
From: Mission Viejo CA
The picture posted by Vetteoz is the Blower Resistors (see his schematic). The High Speed Blower Relay (see schematic) is located below the fan motor (if it's the C60 a/c system).
Last edited by Hot Rod Roy; Jul 1, 2013 at 02:16 AM.
Thread Starter
Racer
Joined: Apr 2007
Posts: 336
Likes: 0
From: Bruce WI
Dont know if its a C60 or C68, dont know what that refers to. I cant look at car right now as it is in the bodyshop getting a bad spot fixed. Hope its the control module cause thats only $19
Thread Starter
Racer
Joined: Apr 2007
Posts: 336
Likes: 0
From: Bruce WI
The bcm looks fine? If wire loops are good is it okay? When I use a jumper wire on the plug that goes to the switch I get high fan thru each terminal. When pluged in nothing on any setting except high.........help please
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
C60
You don't have a BCM ; you have resistors
Which switch , the one in the dash
Got a DVM?
you need to check the resistor pack for continuity and the dash speed selector switch to see if it is working.
It may not be switching across the Lo speed circuits
You don't have a BCM ; you have resistors
Got a DVM?
you need to check the resistor pack for continuity and the dash speed selector switch to see if it is working.
It may not be switching across the Lo speed circuits