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no heat with vacuum on heater valve 900 1994

posted by  bcg on  Fri Oct 21 11:42 CST 2022
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last visit: Sun Jul 27 08:12 CST 2014
[RELATED]

hi,
i have a 94 940 with ac.

1. i have no heat when i dial the mcc switch to heat.
2. i do have heat if i take the vacuum line off the heater valve in the engine bay.
3. i have no heat when i put the vacuum line back on the heater valve.
4. the vacuum registers work (defrost, floor, etc)
5. i don't hear a hissing sound as if i have a vacuum leak.
6. i don't believe i installed it backwards, with the arrow pointing to the heater core.

it appears that my dial switch for heat is not working.

how does this dial operate; how does it relate to the heater valve? it has something to do with the vacuum, i'm sure, but that's the extent of what i know.

the heater valve is the motorcraft yg136, installed 1.5 years ago, no leaks.

thanks,
byron golden
86 245
92 245
94 940






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