1976 260Z with Factory AC. Auto adjusting temp control. No heat modulation to speak of. As soon as I move the temperature control from full cold to warm, I get a blast of full hot air. No modulation of Temperature at all. Moving temp control the slightest bit ( less than 1/4" ) gives full hot air.
Auto Kock ( 27116-N4220 ) seems to be adjusted properly as per FSM, so I have a sneaking suspicion that this valve is stuck open or the internal O-Ring is leaking and allowing hot water to bypass.
Vacuum controlled water valve seems to be working properly. It's either closed or wide open. And I can shut heat off entirely if I move the Temp lever to Full Cold. So that would indicate that the Vacuum controlled " secondary " water valve is working correctly.
Question is. How hard is it to remove the complete Auto Kock assembly with it's capillary tube? The valve itself is reasonably easy to get at, but the capillary tube looks like it terminates behind the heater core or evaporator? I sure as heck don't want to pull that mess apart!! Looks like an SOB to get at.
Any one pull one of these units before and can give some advice? Can you convert to the manual style water valve? ( 27116-N3600 )
Edited by Chickenman, 19 September 2016 - 12:23 PM.