Ac cold air
Thread Starter
Racer
Joined: Jan 2006
Posts: 313
Likes: 3
From: North of Boston Ma
Ac cold air
I had my ac correctly charged by a ac tech but I cant get the cold air blowing into the passenger compartment. The ac compressor in the engine bay wont turn on by using the climate control system. I did jump it to get the 3lbs in the system. Does anybody have any suggestions on what to look at next.
I have tried several climate controls so I would think thats not the problem and all the wiring harness is new.
71 small block coupe factory air
I have tried several climate controls so I would think thats not the problem and all the wiring harness is new.
71 small block coupe factory air
Last edited by 19LEW71; May 9, 2010 at 09:05 AM.
Race Director
Joined: Sep 2002
Posts: 10,362
Likes: 5
From: San Diego - Deep Within The State of CONFUSION!
I had my ac correctly charged by a ac tech but I cant get the cold air blowing into the passenger compartment. The ac compressor in the engine bay wont turn on by using the climate control system. I did jump it to get the 3lbs in the system. Does anybody have any suggestions on what to look at next.
I have tried several climate controls so I would think thats not the problem and all the wiring harness is new.
I have tried several climate controls so I would think thats not the problem and all the wiring harness is new.
Thread Starter
Racer
Joined: Jan 2006
Posts: 313
Likes: 3
From: North of Boston Ma
Not sure that there is one the 71's if so where do I located. Could it be the ac blower resistor located at the top of the ac box on the firewall? I,m getting 12v at the connection on the compressor before actually plugging in the connection but the compressor clutch wont engage.
Racer
Joined: Nov 2005
Posts: 409
Likes: 5
From: Orange County CA
I had the same problem with my 71, except mine stayed on all of the time.. Could be the AC Relay mounted under the dash on the passenger side...The relays are not available anymore so I wired in a standard Bosch relay..works perfect ever since..There are 2 relays that affect the compressor, the AC relay and an anti dieseling relay. You can do without the anti dieseling relay..
If there is not 12 volts going to the compressor when the AC is turned on, it has to be a bad switch or switch out of adjustment, or a bad relay..
Here is my original post...
http://forums.corvetteforum.com/c3-t...always-on.html
If there is not 12 volts going to the compressor when the AC is turned on, it has to be a bad switch or switch out of adjustment, or a bad relay..
Here is my original post...
http://forums.corvetteforum.com/c3-t...always-on.html
Last edited by Corvettetodd; May 10, 2010 at 04:00 AM.
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
You need to look at a wiring diagram and figure out why you don't have 12v at the compressor. Could be a fuse, could be a switch, could be a loose wire/broken wire/disconnected wire, etc. Trace it out electrically and you should find it.
Thread Starter
Racer
Joined: Jan 2006
Posts: 313
Likes: 3
From: North of Boston Ma
Markdtn thanks for the response. I do have 12v at the green wire for the compressor and all the wiring in the car is new. Keeping a volt meter at the connection while plugging it in to the compressor----- makes it go to zero volts (no blown fuse). Take it off the conection and check---- there is the 12 volts again.
CORVETTETODD I think thats the direction that I will be going in its got to be one of the two relays or some grounding with those relays. I attached a pic of those relays. I currently have no interior in the car exccept certain essentials to get the electrical working steering colomn,main duct,all harness's wiper control,light switch and so on. I have EVERYTHING WORKING minus only the cold ac air.
CORVETTETODD I think thats the direction that I will be going in its got to be one of the two relays or some grounding with those relays. I attached a pic of those relays. I currently have no interior in the car exccept certain essentials to get the electrical working steering colomn,main duct,all harness's wiper control,light switch and so on. I have EVERYTHING WORKING minus only the cold ac air.
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Possibly the plus and minus are mixed up at the compressor or maybe the diode is backwards. Could be that relay, but I am puzzled why you have power with no load. Could be bad contacts. I would straight wire it out and see if that fixes it before I changed it.
