Automotive Air Conditioning Information Forum (Archives)

slls on Fri August 09, 2013 11:35 AM

Year: 07
Make: pontiac
Model: g6

What would cause a 07 G6 to vent out the low pressure port at times, may go a week then vent.

Olds442 on Fri August 09, 2013 3:57 PM

What do you mean vent ? It should have a cap on it at all times.

slls on Fri August 09, 2013 6:53 PM

It blows the cap off. Not my car, I do have one like it. The low pressure port was replaced and still will vent, according to owner. Took 1 week after port was replaced to vent. Tech now says bad compressor.

webbch on Sat August 10, 2013 12:15 AM

First thing - check the pressures. If that checks out, replace the valve core - could be venting as static pressures build and push their way by a defective valve core.

Just out of curiosity, did it vent on a particularly hot day while the car was out in the sun? Would lend credibility to the argument of a defective valve core if so.

mk378 on Sat August 10, 2013 5:03 PM

Find a different tech. There's no failure mode of a compressor that will do that.

The ports should be able to hold any normal or abnormal pressure in the system. Something else will blow first. Are you sure it's the low side port?

slls on Sat August 10, 2013 6:02 PM

If the low side at the compressor had a debris screen, would that cause it. The tech replaced the low port I was told, 1 week later vented.

mk378 on Sun August 11, 2013 8:39 AM

Blocking the inlet screen would just starve the compressor, it wouldn't have anything to compress, so pressures in the loop would stay near static value. And of course there would be no cooling.

mollygomez on Fri November 22, 2013 4:53 AM

leakage might be there due to which this might be happening. Please check it for any kind of leak.

Chick on Sat November 23, 2013 1:24 PM

The low side of any system would always be lower pressure, at most a little more than ambient when sitting still.. When the compressor is running, it would pull lower and even into a vacuum if the compressor screen was clogged.. Maybe he's talking about the high side?? That would cause pressure in the high side to rise, but never to the point of blowing a cap off.. They have safe guards to shut the compressor off should the pressures go that high...Just my opinion..

Maybe they are taking about the refrigerant pressure relief valve? they blow when pressures get to high usually caused by poor air flow (Fan not working) or other restriction...

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Chick
Email: Chick

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Edited: Sat November 23, 2013 at 1:28 PM by Chick