AC Heater bypass solenoid?
Thread Starter
Instructor
Joined: Apr 2012
Posts: 176
Likes: 10
From: The Woodlands Texas
AC Heater bypass solenoid?
2000 M6 100k
Searching resulted in mixed results. Does the C5 have a heater core bypass solenoid to re-route hot coolant when the AC is trying to cool the car or is that the job of the blend doors? I am curious because if there is no bypass doesn't that mean there is a constant heat source inside the cabin regardless of what the blend doors are doing? If that is the case has anyone installed a solenoid in the effort of improving AC performance?
Searching resulted in mixed results. Does the C5 have a heater core bypass solenoid to re-route hot coolant when the AC is trying to cool the car or is that the job of the blend doors? I am curious because if there is no bypass doesn't that mean there is a constant heat source inside the cabin regardless of what the blend doors are doing? If that is the case has anyone installed a solenoid in the effort of improving AC performance?
Pro
Joined: Dec 2014
Posts: 683
Likes: 275
From: Cincinnati Ohio
Can’t guarantee I am correct but I’ve never known of a GM system from that era made by Harrison Radiator/Delphi Harrison Thermal that had anything like a solenoid. Years ago GM systems used to have water flow valves to regulate water flow through the heater. That’s way back. To the best of my knowledge, it’s simply the air blend valve. As long as the blend door seals well, very little heated air will mix with the cold air.
Safety Car
Joined: Mar 2017
Posts: 3,771
Likes: 940
From: Orlando Florida
