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Vinnie, Did you ever find out what the problem is (was)? I am having
pretty much the same issue on an 87 Celica, it also has the cableless
control unit. I have had the radiator flushed twice within a week to
see if it was a clogged heater core. No change, I disconnected the
wire that controls the heater core bypass valve so it is always open.
I never could find the blend door so that remains an issue but I am
curious about what you found out with the electronic control assy. Did
it solve you problem initially?? Have you changed any of the heater
solenoids?
Thx,
Roy

"vinnie" wrote:[color=blue]
> I am on my second control unit in 2 years. The fan works
> fine, but
> the heat turns on and off at its own will. I forced the
> water valve
> open, but that doesn't fix it as I believe there is an air
> flap that
> would need to be forced open. Does anyone know where I could
> find a
> wiring diagram or know of a repair for this. Searching
> through
> threads this seems to be a common problem. Thanks!
>
> Vince
> Calgary Alberta Canada[/color]

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