Car Questions
RepairPal is your advocate for car care advice and guidance

Accessory Vacuum check valve?

(1996 Chevrolet Lumina)
in Kirkland, WA on October 10, 2011
What is the function of the Accessory Vacuum check valve? For the heck of it I replaced it and all of a sudden my vents in the cabin for air/heat/AC are now WORKING?
Displaying 1 answers & 1 comments
Popular Answer
on October 10, 2011
On some vehicles, engine vacuum is used to operate the cruise control and heater/AC mode and temperature function. If vacuum is lost these systems will not function correctly. The check valve will is a one way valve that allows vacuum to be supplied and also traps vacuum for the accessory system during times of low engine vacuum - under heavy engine load, when the throttle is open.
on October 10, 2011
RepairPal estimates are guaranteed at over 2,000 quality certified locations nationwide. Learn more

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
idle fluctuates cold or warm, car stalls but starts again.replaced the IAC,TPS,plugs fuel regulator,egr found a vacuu...
(1998 Chevy Lumina 3.1 Liter V6) I want to purchase a new beam for underneath my radiator but i'm not sure what the b...
Didn't find what you were looking for?