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06-13-2014, 07:15 AM | #1 |
Private
11
Rep 66
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AC gas refill, pressures
Hi guys!
Was refilling the ac gas yesterday on a ac machine in a car shop. After it was finished (took about 30 mins) - the high pressure was reading up to 22-23 bar. Is that correct? |
06-25-2014, 10:05 PM | #2 |
Major
77
Rep 1,001
Posts |
23 bar = 333 psi. WAAY too high.
What were the conditions outside? Hotter will cause higher pressures, but that is still too high. Was a fan blowing on the car? Was the engine at 1500-2500 RPM? This is the generic chart based upon some baseline thermodynamics for HFC-134a. In practice when charging by mass, which is the only appropriate way to do it (after properly collecting the refrigerant and vacuuming down to <1000 micron for >30 minutes), Ive found that pressures are usually lower. Does anyone have access to an FSM to identify the appropriate working pressures for this car or any BMW AC system? |
Appreciate
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