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95 Pickup-Engine surges with heater on

783 Views 1 Reply 2 Participants Last post by  trythis
My truck engine surges high and low only when the heater is on. If I turn off the heater it seems to run just fine. Any ideas?

Diane
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Try changin your thermostat, I am guessing your water temps are changing suddenly but that seems odd to me.
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