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Randall C
Randall C, ASE Master Tech
Category: GM
Satisfied Customers: 12744
Experience:  ASE Master Tech, 35 years, Foreign/Domestic repairs
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GM Envoy: 2003 Envoy. Low pressure switch replacement. Do

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2003 Envoy. Low pressure switch replacement.

Do I just unscrew the old one and put in the new one?
Hello, I am Randall

the fitting the switch screws onto has the schrader valve in it, like a tire valve stem
Yes,, you unscrew it, you may lose a quick short spurt of 134 but nothing to worry about
You need to be sure a new oring is put on the fitting and that oring has some light film of oil on it so the seal is good

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