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Bad TXV or Improper/Contaminated Charge

tomibriggs on Sat July 11, 2009 11:58 AM User is offline

Year: 1996
Make: Toyota
Model: Corolla
Engine Size: 1.8
Refrigerant Type: 134
Ambient Temp: 85
Pressure Low: 35
Pressure High: 200
Country of Origin: United States

Hello a/c experts,

If all else check out ok(pressures, fax, etc.) yet cooling when the car is idling stationary is still insufficient and I hear constant hissing from the evaporator,
could this be a sign of stuck TXV or could the constant hissing be due the TXV working twice as hard because the system is contaminted/improperly charged?
The compressor was changed about 4 years ago. Not sure if the drier was also replaced and whether or not the system was properly vacuumed prior to charging but the performance has always been like this…it is only that I’ve decided to do something about it. I plan to simply have the system recovered then properly charged. What is your expert guess on the condition of my expansion valve versus system charge?

Thanks!

TRB on Sat July 11, 2009 1:54 PM User is offlineView users profile

Is the return line from the evap cold? Is so might try crimping off the heater lines.

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Chick on Sat July 11, 2009 7:16 PM User is offlineView users profile

Also try feeling the lines into and out of the drier, they should be the same temp. If it's cooler coming out, it's clogged, and if you are going to recover the refrigerant, change the drier and expansion valve and check for debris in the system.. A system flush may be needed..

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Chick
Email: Chick

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tomibriggs on Mon July 13, 2009 11:28 AM User is offline

The evaporator outlet pipe compared to the hot inlet was COOL to the touch....not cold but just cool. No pipe sweating neither.

I also tried pinching the heater line with a c-clamp. No difference in vent temp.

Both inlet and outlet pipes of the drier/receiver felt warm. I was able to confirm from the receipt that it was replaced along with the compressor.

Any other simple tests I can do before having the system evacuated and replacing the TXV and drier?

Edited: Mon July 13, 2009 at 11:30 AM by tomibriggs

TRB on Mon July 13, 2009 2:37 PM User is offlineView users profile

Are those pressures at idle or 1500rpm?

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When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

tomibriggs on Mon July 13, 2009 2:53 PM User is offline

Not sure. I will re-take pressure at 1500rpm and get back to you. Thanks.

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