I have a 1986 X with A/C. The heater control valves are no longer available and mine started leaking. I replaced it with a Everco/Heater Control Valve 74004:
http://www.autozone.com/1/products/106005-heater-control-valve-everco-74004.html
The size (5/8") fits stock hoses. I made a mounting bracket and drilled two holes to mount it on the existing bracket, and two more holes and a bracket for the cable. I also had to fabricate a lever to get the desired angle and length.
https://youtu.be/EiN3KNOKMck
http://www.autozone.com/1/products/106005-heater-control-valve-everco-74004.html
The size (5/8") fits stock hoses. I made a mounting bracket and drilled two holes to mount it on the existing bracket, and two more holes and a bracket for the cable. I also had to fabricate a lever to get the desired angle and length.
https://youtu.be/EiN3KNOKMck
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