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sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 22805
Experience:  ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist
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1999 dodge 2500*****heater is stuck on windsheld

Customer Question

1999 dodge 2500*****heater is stuck on windsheld defrost what the problem ? ***@******.*** don
Submitted: 2 years ago.
Category: Dodge
Expert:  sprinkles08 replied 2 years ago.
Hello and welcome to JustAnswer!
The mode door actuator is designed to default to defrost when vacuum to it is lost. Your issue could be that the door is broken or bound up, but it's more likely that you have lost vacuum to the actuator. Lost vacuum could be an issue in the dash or a failed control head, but it's more likely to be a disconnected or damaged vacuum line under the hood. Vacuum comes off the right side of the intake and goes up to the reservoir in the wiper cowl, it splits off and goes through the firewall at the heater hose location.