Quote:
Originally Posted by kenstfelix
i bypassed the servo and the heat works. i was going to put a valve in so i could turn on and off flow to the heater core.
would it even possible to get the a/c working if the servo is bypassed?
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Yes, this is currently how my 79 TD is set up. I used 2 3/4 PEX tees and a 3/4 PEX ball valve in place of the connections at the servo. I teed the two main hoses together and still had the flow running to and from the heater core. Then I installed the ball valve in line to the heater core. A/C works fine. I think there is some sort of newly developed delay for the system coming on but if I really need A/C I hit defrost (since no heat it just blows cooled air) and then switch to another one. I assume it is because the servo sensor can't detect the heat from the coolant.
If I want heat I just have to open the hood and open the ball valve. Of course if I want the heat to stop I would have to open the hood again and shut the valve but I only drive in the summer so it is not a big deal to me.