[DML] Re: A/C Question( A/C expect needed)

["David Teitelbaum" <jtrealty@xxxxxxxxxxx>]

To check the efficiency of the A/C system you measure temp difference
across the evap coil. It's called delta "T". What you need to do is
know the temp of the air going into the coil and the temp after it
comes out. It should be at least a differential of 20 degrees. If the
air in a hot, overheated passenger compartment is 100 degrees do not
expect better than 80 degrees to come out of the vents. You should not
block off the heater by shutting the valve. Eventually the heater core
may corrode. I would jump the hoses out at the motor and drain the
heater. Test the temp drop with the heater fan on high speed and make
sure both radiater fans are running, the fans are not loose on the
shafts, and they are both turning in the right direction. Be sure
nothing is blocking the grille, or the radiator or the evap core, your
high side pressure and low side pressure seems too high (this is
asuming you have the correct amount of R-134).
David Teitelbaum
vin 10757


--- In dmcnews@xxxxxxxxxxxxxxx, John Podlewski <john_podlewski@xxxx>
wrote:
> A/C only gets down to 61 F. I am using R134a  and have recharged and
evac. several times.  



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