My 05 equinox heat/air was blowing perfect, and then slowly started to stop, coming on sometimes when I would turn the middle knob, until stopping completely. We replaced the resistor, but that did not fix it.
Answer: If you mean the fan is blowing fine, but the air temperature looses heat, then this is not a blower resistor problem.
You may have a low coolant problem.
A leaking water pump or bypass manifold gaskets.
Possible broken temperature door in dash.
See this link for more info on leaking headgaskets.
See this link for Chevy Equinox temperature door pictures.
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