A/C Help Please
Thread Starter
Melting Slicks
Joined: Feb 2006
Posts: 2,938
Likes: 62
From: Columbia SC
A/C Help Please
96 vert auto with electronic climate control.
Last time I used the A/C it worked fine with no isues.
Everything works on the head unit and will cycle through every button and blows correctly. A/C clutch does not engage at all, but like I said all positions work just fine just blows very hot air.
No flashing for codes on the HVAC Head unit.
Disconnected the neg battery cable for a few minutes with no success.
Any help appreciated, its freeking hot down here.
Thanks in advance
Last time I used the A/C it worked fine with no isues.
Everything works on the head unit and will cycle through every button and blows correctly. A/C clutch does not engage at all, but like I said all positions work just fine just blows very hot air.
No flashing for codes on the HVAC Head unit.
Disconnected the neg battery cable for a few minutes with no success.
Any help appreciated, its freeking hot down here.
Thanks in advance
Burning Brakes
Joined: Feb 2009
Posts: 785
Likes: 3
From: Richmond Virginia
If you haven't already checked there is a AC clutch fuse right side of dash fuse box. Be sure that's good and has power. Next I'd check the pressure cycling switch. Two wire switch located on the suction line just outside the evaporator housing. The blue wire should have 12 V. w/AC on. Check both wires while still connected to switch--green/white would have 12 V.--IF it is not low on R-134 (that may be your problem) and if the cycling switch itself is good. If you have voltage on the blue wire and not the green/white--remove the connector and jumper the 2 wires--if clutch engages you're likely low on R-134. Somewhere to start anyway.
Thread Starter
Melting Slicks
Joined: Feb 2006
Posts: 2,938
Likes: 62
From: Columbia SC
I am going to check the fuses tonight, but here is what I have done so far. Refridgeant was low so I added to proper level. Unplugged the connector on top of the compressor and with the car running and the ac switched to on had no power to connector. Jumped power from the battery to the compressor and compressor came on as soon as I hit it with 12 volts.
Tracking down electrical problems is time consuming but logical.
Tracking down electrical problems is time consuming but logical.
Burning Brakes
Joined: Sep 1999
Posts: 786
Likes: 31
Cruise-In II Veteran
Occasionally the C-4 computers will act a "little flaky" and throw a code and not start the panel lights blinking.
If the refrigerant is low the computer will shut off the compressor circuit and it will remain shut off until the computer is reset.
Disconnect the battery for 30 seconds or more to re-boot the computer. This may do the trick.
You may also want to check for any trouble codes before you do a re-boot. (re-booting wipes out any stored codes)
http://www.corvetteactioncenter.com/...agnostic+Codes
If the refrigerant is low the computer will shut off the compressor circuit and it will remain shut off until the computer is reset.
Disconnect the battery for 30 seconds or more to re-boot the computer. This may do the trick.
You may also want to check for any trouble codes before you do a re-boot. (re-booting wipes out any stored codes)
http://www.corvetteactioncenter.com/...agnostic+Codes
Thread Starter
Melting Slicks
Joined: Feb 2006
Posts: 2,938
Likes: 62
From: Columbia SC
Disconnected battery overnight and reconnected to no avail. I started the car and jumped the compressor from the battery to run it and nothing got cold. I think its a refrigrant leak. I am going to get some guages and check that.
Oh and no codes at all.
Oh and no codes at all.
Thread Starter
Melting Slicks
Joined: Feb 2006
Posts: 2,938
Likes: 62
From: Columbia SC
Just put a full can of refridgeant into the car (last can only had a little left over which may be why it had no effect) and the compressor is now cycling on and off. Think I still need more as the compressor cycles on and off very quickly.
I wonder why it did not throw a low collant code. Getting another can on way home as I got a small can and the guage showed it was not full yet.
May have solved the problem. I will let you all know.
I wonder why it did not throw a low collant code. Getting another can on way home as I got a small can and the guage showed it was not full yet.
May have solved the problem. I will let you all know.
Last edited by Fast Cop; Jun 8, 2011 at 03:54 PM.
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Thread Starter
Melting Slicks
Joined: Feb 2006
Posts: 2,938
Likes: 62
From: Columbia SC
No leak in the system but it did need a little. The problem now is that the compressor is comming on and off about every 3 - 5 seconds and keeps doing this. Any suggestions?
OK now the compressor is on when the A/C is on but the evaparator bairly get cold and swettie. Is my system clogged?
OK now the compressor is on when the A/C is on but the evaparator bairly get cold and swettie. Is my system clogged?
Last edited by Fast Cop; Jun 10, 2011 at 05:03 PM.
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
You really need gauges. The A/C guys will generally check it for no charge. If it is cycling 3-5 seconds, it still sounds like it's still low. If you had a clog your high side pressure would be in excess of 250 or 300, but you need a gauge.
First time my Freon got that low I had no code and it did not cool either, similar symptom. The receiver was not that cold either. After adding Freon all was normal.
First time my Freon got that low I had no code and it did not cool either, similar symptom. The receiver was not that cold either. After adding Freon all was normal.
Thread Starter
Melting Slicks
Joined: Feb 2006
Posts: 2,938
Likes: 62
From: Columbia SC
OK thanks for all the input. I have checked everything and the freon I put in is still holding. I believe I might have a clog at the expanssion tube orifice. Everything seams to be pointing to that.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
I'd guess there might be an intermittent at the Low Pressure Switch which isn't that uncommon for this Year; particularly since there's no Low Gas Code. Remove and make sure there's a completed circuit across the switch terminals. Re-install the Connector and try holding it in place. Wriggle it around and see what happens. Monitor the Low Side and make sure it doesn't cutout until 22.5 psi.