where can i find new check valves for my truck. what numbers can i give the dealer. they can't find the valve

 

Avoid dealer. Amazon has them:
https://www.amazon.com/ACDelco-14047619-Original-Equipment-Control/dp/B000C982H2

 

thanks for your help. i will go online to check on them.

 

You can get them at your local napa.
https://www.napaonline.com/en/p/NDP7301349

 

Napa carries Dorman chinese junk. I know. Used them for years. Then I found the OEM AC Delco part that is shared with GM on Amazon. Much better part! I had bad vents (for the umteenth time) with the Napa valves and both passed the "blow/suck" test. Replaced with AC Delco parts and everything worked.

 

thanks again guys. going to order parts