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Where is the AC Low pressure valve on a 1999 Pontiac Grand Prix?

I need to know where I can find the low pressure side valve under the hood of my 1999 Pontiac Grand Prix. I got a can of R134 refrigerant and want to add it but I am not totally sure where the low pressure valve is located. Can someone please help me and specifically detail where it is located and what it looks like on on the 99 Grand Prix? Thanks a lot. Appreciate it very much.

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  • Anonymous Mar 15, 2014

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Sometimes its behind the alternator real close to the firewall. Find the bigger of the two hoses and pipes the low side is always bigger. Also the cap is blue and the fitting for the charging can will only fit on the right valve.

Posted on Apr 24, 2009

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Stand on the passenger side and look down by the firewall it's by the exhaust manifold

Posted on Jun 16, 2009

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