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Old 05-16-2015, 07:47 AM   #1
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Join Date: Jul 2014
Posts: 29
Dash air

My Dash air hasn't been very cold lately so I tried servicing it with 134a freon that I bought at Walmart with gage. The initial pressure reading was below 10 psi at 75* ambient. The gage says I should see between 35-45psi. I put in one 12oz can of leak stop freon and several 12oz cans of 134a freon. When the gage got up to about 35 psi, the compressor clutch would intermittently stop and start and would sometimes make a screeching noise like metal on metal for a couple of seconds or so, while turning slow, then turn off/on, for a few times, then start turning at regular speed. Then start this process all over again. I thought maybe there was too much pressure or something, (inaccurate gage?) so I released the pressure down to 25 psi and the compressor clutch stopped doing this and the dash air is now cold. Does anyone know if too much pressure can cause the compressor to do this? Thanks for any suggestions.

Larry, 03 Allure 30856

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Old 05-16-2015, 08:18 AM   #2
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Join Date: Feb 2010
Posts: 4,510

Too much will not leave room to compress the gas and yiu coukd be in trouble.

Rhat is why the pros use a manifold that has both high and low side pressures with other tools.

The temp to pressure on low side is just one input.

If working fine you may be okay but should have it checked out properly if you get a chance
Tony & Lori
1989 Country Coach Savannah SE
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dash, dash air

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