× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Re: vents go to default position when load is applied to engine
Posted to HVAC Forum on 6/12/2012 4 Replies

[...trimmed text...]

I didn't know the vacuum balls had an internal check valve.

Do the original GM ones have an internal check valve too?

[...trimmed text...]

Login to read more.

4 Replies Received (View Replies)