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OK, I bought a valve at autozone..... Posted by TonyJ [Email] ![]() ![]() ![]() In Reply to: On of Off, B Millar ![]() ![]() |
$23, made in China. "4-seasons # 74809 HEATER VALVE-FORD. Ready-air number is 5954. It has a metal shaft and valve plate, with o-ring seal, thus would not fail catastrophically like the original valve. But the pipes are only 5/8", not 3/4", so I will likely return it. It would require blocking one port, but would work as follows.
Original valve:
C=Top port (closest to diaphram)
A=Mid port
B=Bottom port
With no vacuum, A and C are connected and B is blocked.
With vacuum, A and B are connected and C is blocked.
Ford valve:(see picture)
A=Top Left (has an arrow pointing toward the other ports)
B=Below A
C=Right of and opposite B
D=Below C and closest to vacuum port.
With no vacuum, A and C are connected but isolated from B and D, which are also connected to each other.
With vacuum, A and B are connected but isolated from C and D, which are also connected to each other.
To use the Ford valve, connect A, B (may require re-routing hose), and C as for original valve and block off D.
I'm going to keep looking for a closer replacement.
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