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Cannot reach A/C high/low pressures
This is a 1990 Geo Metro. This car was previously converted to R134a.
Recently I replaced the compressor and dryer. I did everything by the book. I flushed the system with isopropyl alcohol, replaced o-rings, evacuated, oiled it and held a vacuum for several hours. There were no leaks. I even purged it again with dry N2 and evacuated again. Book calls for 1.1 lb of refrigirent (this was for R-12, so I was ready to use only 1 lb of R134a). After putting in 1 lb of R134a, the pressure did not reach the specified values (200/25 psi on the high/low sides). I added some extra refrigirent, and then some more. The pressure was still low. I ended up putting in twice the required amount of refrigirent. But the pressure was still only 125/25 psi. I do not hear or see any obvious signs leaks. Even if there were a leak, wouldn't the pressure initially go up and then slowly come down? Where is all the extra refrigerent going? The air is blowing a little cool, but nowhere near where it should be. The high side tubes are hot, which is a good sign. The compressor is turning over fine, and there are not funny sounds. I am at a loss what to try next. Any suggestions are appreciated. |
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