Air Conditioner question: high low side pressure

05-07-2012, 06:34 PM

loneranger loneranger is offline

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Join Date: Nov 2005

Location: taylorsville, nc

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Air Conditioner question: high low side pressure

My 90 350 SDL has been converted to 134. Everything was fine for years but now at 70 degrees ambient temp my high side pressure is 150 psi. The low side is about 30 psi but after it runs awhile the AC stops working, High side is still 150 but the low side is 70 psi. Is there a relief valve bad? Or, what could the problem be?

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