Posted by Mark Robke on July 17, 2016 at 15:11:04 from (75.89.156.193):
In Reply to: CIH 8820 A/C posted by jeremy in ne on July 16, 2016 at 17:14:57:
When you shut off the a/c,and let it sit for a few minutes,do your pressures equalize?If they do,probably no blockages.If the low side remains in a vacuum,then you have a blockage. If you have enough refrigerant in the system,a seat of the pants way of telling,with the system off,is that your pressures will read close or higher than ambient temperature,with the engine temps cool too.Most a/c gauges show this reading in smaller #s.You should not have frost at the expansion valve,that would indicate to me,a blockage or low charge.You could add more refrigerant,as a gas,thru the low side,with engine running until your high side comes up.If it stays low,and you add another pound,and the low side remains in a vacuum,then you have a restriction or blockage.The line will get cold at the restriction.I would bet dirt got to the expansion valve-it happens;sometimes you need to do a flush again.Flush the line from the condenser to the expansion valve.And backflush the condenser. Also that you said pressures started to rise then dropped off,sounds like dirt made its way to the expansion valve,and stopped it up as it was running.Let us know what you find. Another thing,if you vacuum the system,after you let it sit to check for leaks,vacuum it some more.I always feel that there is no perfect system,and immediately charge the system after pulling the vacuum.I like an hour at least.Mark
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