a/c???????
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Posting Guru
Joined: Sep 2010
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From: Grand Bay, Al
a/c???????
can anybody tell me what pressure readings i should have on both the high and low side of my a/c? i know a little about it but never enough.
my air works then quits. i bypassed the low pressure switch and it came on. but i want to know if im low on freon or if the switch is going out
my air works then quits. i bypassed the low pressure switch and it came on. but i want to know if im low on freon or if the switch is going out
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Joined: Feb 2011
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on a good warm day, something like 35-40/145 ish, been a while since I worked on auto A/c, I do HVAC for a living though. It's pretty common that if at idle for a while A/C will not perform well. The speed of compressor, air over condenser all plays part. The low pressure of the last statement will cause low pressure in and out, you should here the compressor cycle at idle.
4000 rounds a min
Joined: Apr 2010
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From: Albemarle NC
Here check out post #3 in this thread https://www.ford-trucks.com/forums/5...-problems.html hope this helps
Hotshot
Joined: Jan 2002
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From: La La Land
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Posting Guru
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From: Grand Bay, Al
ok. thanks for all the input. ill start with checking the pressure then if needed move on to that
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From: Atlanta, Georgia
Thank you for this post! I was just about to make a thread about this same issue. I don't guess my girlfriend appreciates the heat and humidity that Georgia offers in ... well all summer long! lol
Post Fiend
Joined: Feb 2007
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From: Dallas-Ft. Worth
Pressures vary according to ambient temps. You really need a chart to be 100% accurate. On a warm day, it should be around 200 on the high side. 145 seems a little low to me for some reason. 40ish seems about right for the low side... I guess I'll be finding out though. My compressor started leaking oil from the center hub last month. 
Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
can anybody tell me what pressure readings i should have on both the high and low side of my a/c? i know a little about it but never enough.
my air works then quits. i bypassed the low pressure switch and it came on. but i want to know if im low on freon or if the switch is going out
my air works then quits. i bypassed the low pressure switch and it came on. but i want to know if im low on freon or if the switch is going out
Mine quit working like you describe. Only worked when it wanted to.
The problem ended up being the wiring right at the plug had broken from ten years worth of engine vibration.
