A/C Pressures
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Joined: Apr 2006
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From: KC, MO area
Low pressure should be read at the evaporator temp on the temp scale on the gauge. The high pressure should be 1.8 to 2.1 times the ambient temp. Best to have a large fan blowing on the condenser to get accurate readings.
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CF Senior Member
Joined: Feb 2011
Posts: 345
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From: Middletown DE
the system was working but blowing a little warm went to check the pressures and they looked low but when pulled my high side connection i lost all the freon due to a bad schrader valve, i fixed that not sure whats original on the system just bought it in february with 256,000 miles on it and was suprised it worked at all i have a book that has the pressures listed for it but wasn't sure how accurate the numbers where,i'm saving my money for the factory books
Sean
97 4x4 burb
Sean
97 4x4 burb
Administrator
Joined: Apr 2006
Posts: 11,337
Likes: 194
From: KC, MO area
What I gave you was for R12 and I suspect that a '97 has R134a. High would be about 2.2-2.5 times ambient.
You'll need to evacuate the system now that it's been opened to the atmosphere to remove any moisture. Then you have to estimate how much oil was lost and add that along w/ the new freon.
You'll need to evacuate the system now that it's been opened to the atmosphere to remove any moisture. Then you have to estimate how much oil was lost and add that along w/ the new freon.
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Thread Starter
CF Senior Member
Joined: Feb 2011
Posts: 345
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From: Middletown DE
it's 134 dont think it was coverted being a 97 the haynes book(automotive heating and air conditioning from approx 2000) i have has the low at 28 and the high at 320 at 80 degs,i didn't loose any oil it was a slow hiss and i rounded up a vacuum pump just wanted to make sure the numbers were correct i'm going to put a new oriface tube in while i have it apart
Sean
97 4x4 burb
Sean
97 4x4 burb
Thread Starter
CF Senior Member
Joined: Feb 2011
Posts: 345
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From: Middletown DE
i'll let you know might be a couple of weeks borrowing a vacuum pump from a friend of a friend you know how that goes my book only goes to 1999 they have 32 to 40 for the low and 190 to 220 for the high they might be close enouph numbers
Sean
97 4x4 burb
Sean
97 4x4 burb
