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How do you read a/c manifold gauges?
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Registered User
Join Date: Nov 2000
Location: Ashburn VA.
Posts: 667
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I found this on the web the other day, see if this helps.
Red to high side, blue to low side... That is pressure, not hieght..If your system is empty, a vacuum needs to be pulled. If there is positive pressure, you can top it off. Hook the "BLUE" line to the low side fitting, and the "RED" line to the high side fitting, The yellow is for the refrigerant. make sure you purge the air out of the lines before adding. Add refrigerant until the high side is about 2.2 times the outside temp. Check the cooling. Best to charge when the outside temp is above 70 degrees. Make sure the "wheel" on the high side (RED) is closed while checking pressures and charging.. Otherwise the pressure can blow up the can...Be careful!!!
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George My Owners Gallery Page 1983 911SC - Built July 1983 #2547 out of a total 2559 shiped to the US. in 1983. Could be the last U.S. production SC still running. 1995 BMW 525I 2001 Highlander- kid mover Last edited by GB83SC; 08-24-2003 at 05:11 PM.. |
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Unconstitutional Patriot
Join Date: Apr 2000
Location: volunteer state
Posts: 5,618
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Robert, unless you are using some funky gauges, you do not need to open the valves. What you are doing is connecting the high and low sides of the system. When you do that, the pressure is going to be equal for the entire system.
Read the gauges with the valves closed. You only open a valve when you're extracting or adding refrigerant. 9 times out of 10, you will be operating the blue valve, or the low side. You can open the high side when you're pulling a vacuum, or when you're charging an empty system with liquid or gas refrigerant. Hope this helps. Jürgen |
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Registered User
Join Date: Apr 2002
Location: Raleigh, NC
Posts: 443
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Jurgen is correct, the manifold is designed to read pressure with the valves closed. You only open the valves to connect the center hose to either side.
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Walt 82 SC |
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Registered User
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Quote:
![]() To read pressures on the system, I open the valves (1) and (2) and connect them to the high and low side fittings, make sure (3) and (4) are closed, then start the engine and a/c and read direct. Is this right?
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Unconstitutional Patriot
Join Date: Apr 2000
Location: volunteer state
Posts: 5,618
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That's right!!!
Jürgen |
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