Pressures for air conditioning on 1991 Chevy lumina

Asked by May 02, 2015 at 07:32 PM about the 1991 Chevrolet Lumina

Question type: Maintenance & Repair

3 Answers

At 75° ambient temperature low side 35-45psi, high side 120-140psi. The hotter the ambient air, the higher the pressures will (should) be. Your Lumina was manufactured with R12 Freon, and is not for sale to the public.

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Has it been retroed to 134A?

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I would suggest low side at 30-35 psi and high side 150- 160 psi. But the pressures are relative to outside temp, condenser fan operation, and engine speed. The pressures I noted would be on a warm day, condenser fan on, and engine at 1200-1500 rpm.

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