VIN #4KLC4B1R6YJ805937 / 2000 Isuzu NPR delivery truck.
Did some a/c work and noticed the hoses going to the heater core were the same temp ( approx. 155 deg) with the dash valve set all the way to cold and in recirculation mode. I identified the hose coming out of the water pump as the supply to the core and clamped it off; within a couple min the temps had come down to around 95-100 deg on both hoses and decreased the a/c vent temp a couple degrees. Anyone have a diagram showing the vent/dash controls for the HVAC system on this truck? Would like to have something to check out before I go taking the dash off to see what the problem is.
Did some a/c work and noticed the hoses going to the heater core were the same temp ( approx. 155 deg) with the dash valve set all the way to cold and in recirculation mode. I identified the hose coming out of the water pump as the supply to the core and clamped it off; within a couple min the temps had come down to around 95-100 deg on both hoses and decreased the a/c vent temp a couple degrees. Anyone have a diagram showing the vent/dash controls for the HVAC system on this truck? Would like to have something to check out before I go taking the dash off to see what the problem is.
Aug 22, 2009 at 3:17 AM