What is your question?
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2 Replies
Low coolant level or clogged heater core. Sometimes these are early symptoms of a bad head gasket putting combustion gas into the heater core.
What is the temperature of the 'engine' according to gauge?
8 800 rpm or so can do it Two vacuum canisters, ac and one by brake pedal seem to work fine Blend door shaft moves with knob Stays still when Roma increase Don't know what door does
Could it be the blend door Or vacuum leak