Alfetta Heater Control Valve Rebuild, Part 1
The heater control valve for the Alfetta has been NLA for a while now. This valve is used on all of the Alfettas without air conditioning. It may be used on the air conditioned Alfettas and non- A/C GTV6s; it is definitely not used on the air conditioned GTV6s.
This valve is similar to the one used on the 105/115 cars, except that it has the clamp for the control cable molded into the upper housing. To repair the Alfetta valve, one could buy a 105/115 valve (these are available), drill out the rivets, remove the diaphragm, install the diaphragm in your Alfetta housing, and screw (or rivet, but screws are better) the 2 halves of the Alfetta housing back together.
Fearing that the 105/115 valves would also become NLA, I worked on another solution a couple of years ago. The 35 year old valve on my Alfetta was no longer keeping hot water from flowing into the heater core, but it was not leaking water into the passenger footwell, like the original valve was when I replaced it around 1981.
The first photo shows the rebuilt Alfetta valve. The second photo shows the old diaphragm that was no longer sealing properly when closed. The 3rd and 4th photos show the parts I used to repair my valve. The Dorman part is actually a brake master cylinder part that I modified to replace the damaged diaphragm. Since it is not going to be attacked by brake fluid, I figured it would not be attacked by glycol in coolant.
The 5th photo shows the Dorman part before modification.
75 Alfetta GT (Original owner), 92 164S