Automotive Air Conditioning Information Forum (Archives)

Provided by www.ACkits.com

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives

A/C quit cooling

CmonRef on Mon May 03, 2010 9:27 PM User is offlineView users profile

Year: 1980
Make: Porsche
Model: 911SC
Engine Size: 3.0L
Refrigerant Type: r-134
Ambient Temp: 83
Pressure Low: 45
Pressure High: 250
Country of Origin: United States

A/C system quit abruptly in the last week. @ 82F ambient, static pressure 85. Compressor engages and operates normally. Three condensers, one with electric fan (fan is running). Engine lid closed to pull air thru deck condenser. Evaporator running, outputting air that MIGHT be a little cooler than ambient, but maybe not. Initially, pressures were about 30/150. Added 1/2 can R-134, pressures went to 40-45/250. At evaporator, high side line hot, low side very warm.

System completely revamped 4 years ago and has operated well since then with no problems. Seiko PSV-170 rotary compressor with new seals, new evaporator and expansion valve, two new condensers and one older one thoroughly flushed, and new hoses all around. Converted R-12 to R-134.

I'm thinking the expansion valve is stuck open? Any suggestions for some specific testing that will confirm what the problem might be?

Brian, Chester, VA

Edited: Mon May 03, 2010 at 9:33 PM by CmonRef

HECAT on Tue May 04, 2010 11:04 AM User is offline

Quote
Originally posted by: CmonRef
At evaporator, high side line hot, low side very warm.

I'm thinking the expansion valve is stuck open? Any suggestions for some specific testing that will confirm what the problem might be?


This does not fit with "quit abruptly"; but it just a thought.

If the inlet to the evap is hot (?), you may not be removing enough heat; check the condensers (clean, air flow, fans etc.).

-------------------------


HECAT: www.hecatinc.com You support the Forum when you consider www.ackits.com for your a/c parts.

FLUSHING TECHNICAL PAPER vs2.pdf 

Back to Automotive Air Conditioning Forum

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.