I also am having the same trouble. I recently did a HD gasket and when I back flushed the heater core it push out rusty looking water, twice now, Has good flow when doing so. The inside control unit appears to be working, the vacuum operated valve appears to be opening.
Is it possible to have a heater core clogged but still be able to back flush?
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1986 Supra 3.0 NA Stock
5 Spd. Lexus rims 16 x 7
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