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I'm having a heater problems. I drive down the road and the heat will just go from hot then cool to cold and then then back to hot again. It does it at very randon times. Sometimes going up hill, sometimes going down hill, at one stop light but not at others, and so forth. Just driving down the road the engine temp stays right in the normal range with no flucuation.
What I've tried. Flush the heater core and every line that i can find. removed the heater control valve that is located by the oil filler neck, added a second layer of cardboard to the front of the radiatior. Changed the thermostat.
I am now out of ideas. Any new things to try would be helpful.
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No sooner did I mention it than
<font color="blue">I SAW THIS....</font>
Evidently a vac hose activation. I'm gonna fix mine so I get heat in Max AC. May cure yours.