Engine Size: v6
Refrigerant Type: 134a
Ambient Temp: 80
Pressure Low: 65
Pressure High: 150
Country of Origin: United States
History- replaced ac comp (used), replaced accumulator, condenser and exp valve (all new). Cleaned/flushed all lines etc and evacuated. Held vacuum overnight.
Replaced 134a (2.5lbs according to sticker on car).
Problem-at idle, low side reads high until engine RPMs 1500-2000 and it drops to approx. 30-40 lbs. Cold air at vents (and while driving ..60degrees +/- ) Slow down or idle, temp jumps , almost no cooling at vent. Everything (to me) points to low refrigerant but I know I put in 2 full cans. Charts indicate an open exp valve, but this is brand new. I hate to break into the system again if its not necessary. This is a stretch-can refrigerant be defective (I also purchased that over the internet at a much better price than at Autozone (Dupont 134a).
Thanks for any help in advance...
You did all that work and purchased a used compressor????? 2 1/2 lbs of refrigerant equals 40oz. Is that what you out in?
Sorry, my mistake...It calls for 1.57 lbs. I installed 2 (12oz) cans. I am going to evac the system tomorrow and try to refill with 2 fresh cans of 134. Am I correct in the fact that if the compressor works at 2000 rpm on the suction side, it is ok and I should look toward the expansion valve? Note, while driving today (approx. 90 degrees outside) the inside temp never dropped below 70.
Did you tape up the TXV sensor properly on the evap outlet line (as it looks like it is not a block TXV)? Set the interioir fan to low, or even unplug it so there is no airflow over evaporator-- TXV should close down causing low side to drop-- if it does that the TXV is doing what it should-- thus then look to the compressor. I agree with Dougflas your used unit may be tired. Another way to test compressor is to kill the condenser airflow-- high side pressure should rise into the 400's. Be ready to shut it down or turn the condenser fans back on.
Edited: Fri June 14, 2013 at 11:42 PM by mk378
Yes, the expansion valve( located inside the evaporator under dash) is taped and the bulb was reinstalled in the original location. I am running the test you suggested right now. ( yeah, it was a stupid bet to replace the comp with a used one, took a chance, money was short, I burned myself). Thank so far for all the input...
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