Heat problems
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Joined: Jul 2005
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The FIRST thing to check it proper coolant level in the overflow tank. An inch low will cause that problem.. If all that is OK, you can have a circulation problem on an older truck. Partly plugged heater... last possible is the damper door, but it really does not know the truck is HI or LOW RPM.
----the heater is controlled by a damper door inside the duct. The air goes thru the ac evaporator, then the heater core. The door controls the air 0 - 100%. It is not uncommon for the door to break or the shaft / gearbox mounting the door to break. When you change speeds the door flops around.
----the heater is controlled by a damper door inside the duct. The air goes thru the ac evaporator, then the heater core. The door controls the air 0 - 100%. It is not uncommon for the door to break or the shaft / gearbox mounting the door to break. When you change speeds the door flops around.
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earlybird 2
1968-Present E-Series Van/Cutaway/Chassis
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Mar 6, 2018 05:40 PM
