AC Question
Le Mans Master
Joined: Jan 2001
Posts: 6,743
Likes: 1,385
pats67copo
Which car are are you writing about?
Most vehicles typically should come with some low pressure cutout sensor?
If so, then bypass it and just start the a/c. don't even run the car. the clutch should pick up when you energize and drop out when you deenergize.
Unless I am misunderstanding that is all you are trying to find out.
Which car are are you writing about?
Most vehicles typically should come with some low pressure cutout sensor?
If so, then bypass it and just start the a/c. don't even run the car. the clutch should pick up when you energize and drop out when you deenergize.
Unless I am misunderstanding that is all you are trying to find out.
Race Director
Joined: Nov 2006
Posts: 13,251
Likes: 7,840
From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
2024 C3 of the Year Finalist- Modified
2022 C3 of the Year Finalist - Modified
Cruise-In VIII Veteran
Let's guess that your referring to your 71.
Do you own a test light?
Assuming you do, start car and let it idle with the hood open. Switch AC on. On the passengers side inner fender you should see your air-con high pressure line. In about the center of the line, should be a T with a switch in the T. With 2 wires connected to the switch. Take your test light, grounded properly of course. And check for power at these 2 wires at this switch. One wire should be hot with AC turned on.
Both wires will be hot if the switch has enough pressure. This sends power to the compressor clutch.
If you have No power to the low pressure switch, then start looking at fuses, start in the fuse panel. Could be a issue with the switch in the console as well.
But, start at that low pressure switch. If you have power to that, you most likely need Freon. And perhaps you have a leak.
Do you own a test light?
Assuming you do, start car and let it idle with the hood open. Switch AC on. On the passengers side inner fender you should see your air-con high pressure line. In about the center of the line, should be a T with a switch in the T. With 2 wires connected to the switch. Take your test light, grounded properly of course. And check for power at these 2 wires at this switch. One wire should be hot with AC turned on.
Both wires will be hot if the switch has enough pressure. This sends power to the compressor clutch.
If you have No power to the low pressure switch, then start looking at fuses, start in the fuse panel. Could be a issue with the switch in the console as well.
But, start at that low pressure switch. If you have power to that, you most likely need Freon. And perhaps you have a leak.
Thread Starter
Pro
Joined: Jul 2013
Posts: 731
Likes: 64
From: Florida
Let's guess that your referring to your 71.
Do you own a test light?
Assuming you do, start car and let it idle with the hood open. Switch AC on. On the passengers side inner fender you should see your air-con high pressure line. In about the center of the line, should be a T with a switch in the T. With 2 wires connected to the switch. Take your test light, grounded properly of course. And check for power at these 2 wires at this switch. One wire should be hot with AC turned on.
Both wires will be hot if the switch has enough pressure. This sends power to the compressor clutch.
If you have No power to the low pressure switch, then start looking at fuses, start in the fuse panel. Could be a issue with the switch in the console as well.
But, start at that low pressure switch. If you have power to that, you most likely need Freon. And perhaps you have a leak.
Do you own a test light?
Assuming you do, start car and let it idle with the hood open. Switch AC on. On the passengers side inner fender you should see your air-con high pressure line. In about the center of the line, should be a T with a switch in the T. With 2 wires connected to the switch. Take your test light, grounded properly of course. And check for power at these 2 wires at this switch. One wire should be hot with AC turned on.
Both wires will be hot if the switch has enough pressure. This sends power to the compressor clutch.
If you have No power to the low pressure switch, then start looking at fuses, start in the fuse panel. Could be a issue with the switch in the console as well.
But, start at that low pressure switch. If you have power to that, you most likely need Freon. And perhaps you have a leak.
I will check it out thanks again
Pat
