When the vacuum pump is hooked up is it to the high pressure or low pressure valve? Or does it make a difference. TIA
John

When I pull a vacuum on a system, I attach the manifold to both sides high and low and go for at least 2 hrs.

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.