My truck heater will only blow cold air. Why?
By Martin S from Reno, NV
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Bad Control Module, $5 - part; $100/hour for repair ande there is no guarantee that it will do it again. My solution: I have a 1998 Ford Ranger Truck that the Heater Module Switch went bad. A/C works fine but it doesn't do much good as a defroster. The 12 volt Defroster that are sold are about 12 Watts and don't do anything, don't waste your money.
What I did was buy a 400/800 Peak Watt Inverter (Harbor Freight), an extension cord and a 200 Watt Lashko Heater (War-Mart), total cost $60. Hook Inverter cables to battery posts, secure Inverter with zip ties away from engine heat, zip tie extension cord so it doesn't get caught in moving parts, run cord into cab is easiest and hook up Heater. I place the heater on the dash on a rubber mat so it doesn't slide (Velcro will work too) and turn on the heater and use the blower on low to distribute the heat.
On a 1991 Ford Ranger 3.0 the heater blows out cold air works on all three speeds I did notice that the heater core 22 hoses going into it are both cold I flush the heater core out it is running good.
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