I agree that hot water will always run through the heater core this way, but I was told by someone with a chassis manual that even with the valve installed and working, it is only closed when AC is on ‘Max’. Yes, the car does not have a heater control valve, but I’ve had other similar era cars that purposefully did not have them and there was no interior heat and no un-requested, high volume air flow. The re-circulate door is closed on Max and open on all other settings.Īny ideas on what I can check or do to stop the heater vent air flow? Need to fix this because it really gets hot in the car when AC is off. When AC is on (set to Max, Normal, BiLevel or Defrost), the air from the heater vents is cold. That is, the threaded rod attached to the AC/Heater door is pushed in toward the firewall as far as it will go (I’ve pulled the rod out of the holder clamp and have confirmed this, but have no way of visually confirming the door is actually moving although it appears to be). The AC/Heater door is, I believe, fully closed to block heat. With everything off, the air is hot as if the heater is on.
The heater vent air volume is car speed dependent with more air blowing the faster the car is going. Car does not have vacuum controlled heater control valve. All control panel settings direct air where it should go, but with one problem – there is always air coming out of the heater vents, even with everything turned off (both levers are fully to the left). Have read many threads here but none seem to describe my problem. Need some problem solving help in understanding what is going on with ’84 El Camino.