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Old 07-21-2019, 08:47 AM   #1
themanatuf
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AC blowing warm in a 2004

I have a garage queen 2004 thatís been sitting for a few weeks. Decided to take it for a spin and when I turned on the AC I heard a slight hissing sound coming from the front right side of the car. The air never got cold so I brought it home to check it out.

With the car off:
Low: 85 psi
High: 85 psi

Engine running, max AC:
Low: 25 psi
High: 125 psi

It was about 85 out (in Florida so very high humidity). I heard the compressor click when I first turned the air on and it was definitely spinning. When I removed the gauge from the low side port there was air leaking out until I tightened the cap back on. It may have been the same hissing I initially heard, but Iím not 100% sure.

Given the low high pressure side while running, that seems to indicate a leak near the compressor or is it a faulty compressor?

Any thoughts would be appreciated, thanks!
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Old 07-21-2019, 02:31 PM   #2
spd.GTO
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The compressor is working with those pressure. Those pressures seem low your suction should be around 45psi. I would get a can of 134 and add some gas in until the suction line got cold and sweaty. Now all you gotta do is find where it leaked out from. Those valve cores dont always seat back correctly when you put guages on them. You can try pushing it in and out with something to try to get it to seal. Caps are important.
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Old 07-21-2019, 03:11 PM   #3
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From the pressure readings, it sounds like you're low on refrigerant.
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Old 07-21-2019, 05:15 PM   #4
themanatuf
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Thanks, I’ll grab a can and see how it goes. I appreciate the replies!
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Old 07-22-2019, 03:13 AM   #5
gto57
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Quote:
Originally Posted by themanatuf...View Post
Thanks, Iíll grab a can and see how it goes. I appreciate the replies!

Get the bigger can, I used a small can before to recharge it and it wasn't quite enough.
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Old 07-23-2019, 04:46 AM   #6
ATF
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Quote:
Originally Posted by themanatuf...View Post
I have a garage queen 2004 thatís been sitting for a few weeks. Decided to take it for a spin and when I turned on the AC I heard a slight hissing sound coming from the front right side of the car. The air never got cold so I brought it home to check it out.

With the car off:
Low: 85 psi
High: 85 psi

Engine running, max AC:
Low: 25 psi
High: 125 psi

It was about 85 out (in Florida so very high humidity). I heard the compressor click when I first turned the air on and it was definitely spinning. When I removed the gauge from the low side port there was air leaking out until I tightened the cap back on. It may have been the same hissing I initially heard, but Iím not 100% sure.

Given the low high pressure side while running, that seems to indicate a leak near the compressor or is it a faulty compressor?

Any thoughts would be appreciated, thanks!


Give this spot a check on yours, just for peace of mind. It is by the ABS bracket passenger side. My hose had slowly rubbed it's way through and let refrigerant out.

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Old 07-23-2019, 09:49 AM   #7
littlerbigfoot
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Even with a manifold gauge set, it is a bit difficult to get a perfect charge. Outside temperature and humidity dramatically skew the readings. Adding 'a bit of freon' simply does not cut it these days. To easy to overcharge. A few years ago, I emptied the system, evacuated to a vacuum, and installed the closest approximation of the exact required charge that I could. I do not see any other way to do it right. The days of R-12 and a site glass for charging are in the past.
The gauge set and a pump are cheap enough and if you do the job right, the compressor will have the best chance of lasting.
Personally, I hate the newer freon. It stresses the compressor and in general, does not cool like R-12. So, when we had 98 humid degrees a few days ago, I was very happy that the GOAT's AC was able to keep up.

Last edited by littlerbigfoot; 07-23-2019 at 09:54 AM.
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Old 07-23-2019, 11:00 AM   #8
YellowJacketLS3
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it may sound stupid but check on the drivers side under the steering shaft to make sure your A/C line isn't rubbing the column shaft. On my 04 it was rubbing on bumps and turns until eventually one day as was driving my line burst. It started out as slowly becoming less and less efficient until it went through.
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