Im not sure of the wiring set up on mine but im sure my climate control for temp setting is inop. I have to manually open the valve for the heater core. I will check it today and see how its wired. Is this pump only for the heater or does is serve another purpose.

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1980 300SD, Shotzie
1996 Volvo 850, Dark Night
1997 Ford F350 7.3, The Tuna Clipper