Posted by racered57 on July 23, 2020 at 06:42:20 from (47.182.20.228):
In Reply to: Tractor AC compressor posted by Texasmark1 on July 22, 2020 at 15:54:53:
Quoting Removed, click Modern View to see 3.89 charge is a little shy of four lbs freon. three cans @ 12 oz is a little over 2 pounds of freon, vacuum until the gauge does not rise or fix the leak. Stop leak wont help.Use pag oil with "ice" for better cooling. Make sure the belt for the radiator fan is not slipping, air flow across the condenser is very important, the expansion valve is likely inside the evap case, feel the low side plumbing as close to the evap or at the pump while charging, it should get cold as the system fills. If there is no cooling or the high side goes crazy spikeing with more than 275 psi, either there is not enough air across the condenser or the expansion valve is malfunctioning. Feeling the low side for cold will inform you of function,the pressures at the gauges are not the whole story, rather an indication of system efficiency. How long the system hisses after shut down is not info to guide you. Knowing there is air flow across the condenser, knowing the full charge, feeling the low side, high and low side pressure @ FULL charge are usable info. A restriction such as a stopped up exp valve would yield very high high side psi and very low or negative psi on low side.
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