Heater Control Valve: 87-92 V8 (exc 87H) you need to have it

you need to have it in the Accessory position

we don't lend these out to see if it fits or fixes your problem

GMC Trucks

as they are not altered in a way that will effect the mats fitting

1 x GM Crank Case Filter

Heater Control Valve: 87-92 V8 (exc 87H) you need to have itPre heater black plastic valve located on the front side of the upper engine area. This is for Tuned Port Injected. Throttle Body Injected.. an G code engines.. also.. NOT for 1987.. 1987 H code carby engines in Firebird & Camaro but OK for Corvette) Often these jamb on and cause increased heat in the cabin and the Air Conditioning has an impossible job trying to maintain any low temp.