There is a ? rheostat ? Up under the heater box. Mine was doing the same thing. I found the ? rheostat? thing and replaced it. Heater works like a charm.
Sorry I don’t know exactly what you call it. Its hidden up on the heater box though, just follow the wires you'll find it
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN
2013 GMC PU, Oldest Son
71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son
2017 Toyota SUV Daughters car
2018 Traverse , Wife’s Ride
Pittsburg Ca
94565
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