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Low side going into vacum

mainorm on Thu July 29, 2010 1:39 AM User is offlineView users profile

Year: 1999
Make: lexus
Model: rx300
Engine Size: 3.0
Refrigerant Type: 134A
Ambient Temp: 80
Pressure Low: 10-0
Pressure High: 220
Country of Origin: United States

Hi there I got this car and replaced the compressor due to a faulty compressor clutch, add about 3 onz of pag 46 new dryer, I pulled vacuum for 1 hour charged the system to specifications but now that the system is charged no cooling the readings are 10 psi for the low side but if I accelerate the car it will go into vacuum and the high side is about 200 to 220 psi, could this be a restriction in the system if so were should I start thank you.

ACProf on Thu July 29, 2010 2:10 AM User is offline

A REAL good place to start to looking is the expansion valve.

bohica2xo on Thu July 29, 2010 2:17 AM User is offline

First, check the dryer assembly for ice or frost. It is possible to have a restriction in the dryer, causing the low side to go into vacuum.

If the dryer is warm, and the line to the TXV is warm, recover the system, and pull the TXV.

The blockage is someplace between the condensor outlet & the TXV. It should be cold where ever it is.


"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

mainorm on Sun August 01, 2010 9:31 PM User is offlineView users profile

Hi, the problem was the expansion valve I replace it and flushed the whole system I do have a question what would be the proper oil charge for this car I checked with alldata manual and says 8 Onz but I also checked with Mitchell and says 4 onz any body have an idea thank you.

Chick on Mon August 02, 2010 6:49 AM User is offlineView users profile

Check Refrigerant and oil chart seems it calls for 7.75 (8 ounces in the one) for the "total" system requirements..

Email: Chick


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