I dont know about the 92 and up but the 91 has a valve in the metal line that connects to the heater core. It moves with the air temp control.


SOLD!!: 91 LS 95 SR Rear LSD front 95 LS front brakes Dons Bumper 10k Gorilla/Promark winch Safari Snorkel Dual bouncy 31's

1991 Chevy Suburban 33's. All other stock.