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Under the air filter in the air cleaner box

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โˆ™ 2012-02-24 00:54:48
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Q: Where is your ecu on your 99 Pontiac Grand Prix gt?
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Where is the low pressure ac valve on a 99 Pontiac grand prix?

The low pressure port on the 99 Grand am is on the passenger side. It is right against the firewall.

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The 99 Pontiac Bonneville, Firebird and Grand Prix came with the 3.8 engine. The Sunfire came with the 2.2 or the 2.4. The Montana came with the 3.4. The Grand Am came with the 2.4 or the 3.4. The Firebird Trans Am and the Firebird Formula, the 5.7. Only the Grand Prix SE came with the 3.1.

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