what device/diaphram changes the floor air to the dash and can i still buy them?
I have constant hot air blowing from the defroster ducts. I changed the vacuum lines, but I think the valve/diaphram broke.
Check out www.carpartswholesale.com, or www.ultimatez.com. It is probably a vacuum solenoid which has gone bad that is causing your problem.
Search Nissan 300ZX Questions
Nissan 300ZX Experts
Related Models For Sale