Automotive Air Conditioning Information Forum (Archives)

KYGuy on Sun July 03, 2011 5:25 PM

Year: 2004
Make: Chevy
Model: Venture
Country of Origin: United States

Daughter has Chevy Venture and the AC will work at highway speeds. If she slows down or stops, the relief valve pops off. She has had it charged several times.



Any idea of the cause? She is now wanting to borrow my van.

Thanks.

TRB on Sun July 03, 2011 7:05 PM

Find out what the pressures are when it's popping off. Also replace the valve if it has not as many valves will not reset after setting off.

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

KYGuy on Sun July 03, 2011 9:37 PM

If the valve is bad, would it work OK at high speeds and then release at slow speed or when she stops?

chris142 on Sun July 03, 2011 9:43 PM

Radiator fan(s) working?

TRB on Sun July 03, 2011 9:47 PM

Quote
Originally posted by: KYGuy
If the valve is bad, would it work OK at high speeds and then release at slow speed or when she stops?

Again what are the pressures at idle?

Quote
Originally posted by: chris142
Radiator fan(s) working?

Good question.



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

KYGuy on Sun July 03, 2011 10:01 PM

Don't know what the pressure is at idle. Her commute one was is about 45 miles.

TRB on Sun July 03, 2011 10:06 PM

When the valve is blowing off. It makes a difference if the high side pressures are 250 PSI or 460 PSI. . We need some data to try and help with your issue. Try checking the fans as suggested.

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

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

KYGuy on Sun July 03, 2011 10:13 PM

Will check the fans when she comes over tomorrow.

Thanks.

mk378 on Mon July 04, 2011 10:47 AM

If it has a 3 wire sensor on the high side that is responsible for telling the computer when to start the fans, and should the pressure continue to rise, when to stop the compressor (designed to be before the relief valve pops). So if the sensor or wiring is bad you would have no fans and valve popping.