Posted by gbs on May 30, 2016 at 16:53:45 from (68.115.210.77):
I've ran into a snag on a 96 tahoe a/c, a year ago the compressor gave up,i replace the compressor, accumulator,orifice tube, expansion valve and condenser,flushed the lines and evaporator coils front and rear,it worked perfect until the other day the compressor locked up,the oil was clean and no metal was found on the orifice screen,but I flushed the whole thing again,and replaced all above parts again,I drained the compressor and refilled it both times with 8 oz's of pag 150 oil,the system was held under 30 inches vacuum according to the gauge for over 2 hours both times problem is when I get about 20 oz's of 134 in the system which isn't enough to keep the compressor from cycling too fast with the engine at 1500-1800 rpm's the high pressure will go to 350-375 psi and the high pressure switch will shut of the compressor, once it starts this the low side want drop below 50 psi because the compressor is cycling too fast,I thought I had gotten a bad orifice tube so I installed another one and still have the same problem,the rear unit is working fine it's gas flow by-passes the accumulator system,the front unit isn't working,the line from the orifice tube to the evaporator is cool and sweating but nothing else on the low side is cool or sweating,as a normal it will sweat all the way to the compressor,what could be restricting the gas flow thru the evaporator,thanks in advance for any imput on this problem
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