Having problems with your 1986 Dodge D150 ?
Defrost doesnt work - 1986 Dodge D150
Check for a vacuum leak to the heater control switch, check under the hood passenger side of the engine for a small ( not quite as large as a pencil ) black vacuum hose, fallow it from the intake manifold to the fire wall repair any leaks you find if no leaks suspect the vent control switch.....GOOD LUCK
Repair Help & Product Troubleshooting for 1986 Dodge D150
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