AC Just stopped working.
Thread Starter
Burning Brakes
Joined: Jul 2017
Posts: 1,114
Likes: 149
From: Frisco TX
AC Just stopped working.
I had new AC hoses to stop a small leak about a month ago. It ran cold after I got it back.
I tried it to and the compressor doesn't cycle.
I was wondering if this could be low Freon keeping it from coming on or maybe another relay that would cause this.
I tried it to and the compressor doesn't cycle.
I was wondering if this could be low Freon keeping it from coming on or maybe another relay that would cause this.
Le Mans Master
Joined: Sep 2003
Posts: 8,812
Likes: 2,029
From: eastern NC
Since you just replaced some hoses, my first check would be to see what pressure you have in the system. It's entirely possible that an o-ring or gasket didn't seat properly when the new lines were installed and it's lost some of the Freon.
Can you take it back to whoever charged the system for you and have them check the pressures?
Good luck... GUSTO
Can you take it back to whoever charged the system for you and have them check the pressures?
Good luck... GUSTO
Le Mans Master
Joined: Sep 2003
Posts: 8,812
Likes: 2,029
From: eastern NC
If it does not come on at all, you can try bypassing the switch by running a 12v jumper to the clutch on the compressor. Put the switches on the console into the MAX A/C position before engaging the jumper. If the compressor now runs, it should drag down the rpm a bit and quickly begin cooling. If it does neither of these things, you are probably lacking Freon. In which case do not run the compressor in this fashion for more than a few minutes.
If it does begin cooling, you'll probably want to start checking the electronics. From the electronics in the console, to the pressure switch itself.
Good luck and let us know what you discover... GUSTO
Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,028
Okay, you say the compressor does not cycle... Do you mean it comes on and stays on, or it doesn't come on at all?
If it does not come on at all, you can try bypassing the switch by running a 12v jumper to the clutch on the compressor. Put the switches on the console into the MAX A/C position before engaging the jumper. If the compressor now runs, it should drag down the rpm a bit and quickly begin cooling. If it does neither of these things, you are probably lacking Freon. In which case do not run the compressor in this fashion for more than a few minutes.
If it does begin cooling, you'll probably want to start checking the electronics. From the electronics in the console, to the pressure switch itself.
Good luck and let us know what you discover... GUSTO
If it does not come on at all, you can try bypassing the switch by running a 12v jumper to the clutch on the compressor. Put the switches on the console into the MAX A/C position before engaging the jumper. If the compressor now runs, it should drag down the rpm a bit and quickly begin cooling. If it does neither of these things, you are probably lacking Freon. In which case do not run the compressor in this fashion for more than a few minutes.
If it does begin cooling, you'll probably want to start checking the electronics. From the electronics in the console, to the pressure switch itself.
Good luck and let us know what you discover... GUSTO
Melting Slicks
Joined: May 2011
Posts: 2,753
Likes: 119
From: Springfield Missouri
or a paper clip
this switch is called the low pressure switch, thus if you are low on pressure, it stops the compressor from running, saving the compressor. There is a sight glass located where you hook up for high pressure readings(on the inner fender close to the firewall), that is useful when charging the system, small bubbles will be present until it is fully charges. But you are not running at all, so nothing will show. Looks like you have a 78 or newer, so you should have the sight glass, like my 76 does. On some of the earlier cars, it was located on top of the receiver drier, you should have a accumulator drier. Most don't know about the sight glass. You can test for 12 volts on the firewall side of the plug that attaches to the small low pressure switch, no 12 volts then, something is wrong towards the selector switch, maybe a fuse?? If 12 volts are present, and it does not start the compressor after jumping the socket, it could be the clutch on the compressor.
this switch is called the low pressure switch, thus if you are low on pressure, it stops the compressor from running, saving the compressor. There is a sight glass located where you hook up for high pressure readings(on the inner fender close to the firewall), that is useful when charging the system, small bubbles will be present until it is fully charges. But you are not running at all, so nothing will show. Looks like you have a 78 or newer, so you should have the sight glass, like my 76 does. On some of the earlier cars, it was located on top of the receiver drier, you should have a accumulator drier. Most don't know about the sight glass. You can test for 12 volts on the firewall side of the plug that attaches to the small low pressure switch, no 12 volts then, something is wrong towards the selector switch, maybe a fuse?? If 12 volts are present, and it does not start the compressor after jumping the socket, it could be the clutch on the compressor.
Last edited by lvmyvt76; Feb 10, 2018 at 07:33 PM.
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Melting Slicks
Joined: May 2011
Posts: 2,753
Likes: 119
From: Springfield Missouri
Race Director
Joined: Jul 2015
Posts: 13,082
Likes: 3,399
From: SW Florida.
Also, check the low pressure port to see if it has an R34 adapter on it. If so, maybe pick up an R34 hose that has a gauge on it. Screw on a bottle of refrigerant-don't pierce the top-and snap it on to the low port. This will show you pressure when compressor not running. It is possible, likely even that there is a slow leak you will have a hard, expensive, dash-ripping-out time locating. If so, 2 or 3 cans of R34 spread out over the year may be the best way to go.
Thread Starter
Burning Brakes
Joined: Jul 2017
Posts: 1,114
Likes: 149
From: Frisco TX
Also, check the low pressure port to see if it has an R34 adapter on it. If so, maybe pick up an R34 hose that has a gauge on it. Screw on a bottle of refrigerant-don't pierce the top-and snap it on to the low port. This will show you pressure when compressor not running. It is possible, likely even that there is a slow leak you will have a hard, expensive, dash-ripping-out time locating. If so, 2 or 3 cans of R34 spread out over the year may be the best way to go.