| Re: Duracool Dash AC [message #365290 is a reply to message #365286] |
Fri, 09 July 2021 00:59   |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma:
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OK, with Duracool the pressure on the high side is seldom a problem unless you are grossly over charged. I go by the guide lines that 2.5 to 3 cans is what you need in a GMC. The low side pressure you should see is 20 to 25 at around 1500 to 1600 engine rpm. The final thing I do is check the temperature of the air in the vent or on the output side on the evaporator. I use a cheap $10.00 meat thermometer from Walmart.
If you have got three cans in it you are probably over charged. As you increase the charge you also increase the Duracool evaporation temperature and the air temp leaving the evaporator. I shoot for an evap and air temp of 39 to 40 degrees leaving the evaporator.
I do the same on R-134 cars and r-22 houses. The pressures are slightly higher but the 39 to 40 evap temps are just fine and what you want.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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