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moparfl
moparfl, ASE Certified Technician
Category: Dodge
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Experience:  ASE Master Tech Gold level Chrysler Status 30 years dealership exp
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2002 Dodge: up motor, turn on cab heat, blows cold..10 minutes..clunk

Customer Question

2002 Dodge 1500 4.7
Start truck up and warm up motor, turn on cab heat, blows cold. Drive truck 10 minutes, hear a clunk sound, heat blows out. Turn off truck and re-start, same thing over again...??
Submitted: 5 years ago.
Category: Dodge
Expert:  moparfl replied 5 years ago.
Does the clunk sound come from the dash area?
Customer: replied 5 years ago.
yes
Expert:  moparfl replied 5 years ago.
This sounds like you have a blend door that is sticking.you will have to remove the heater housing to repair this door.
Customer: replied 5 years ago.
found blend door to be working fine, not sticking...start truck, blows cold...give a little gas, and blows warm...shut truck off, start back up...blows cold until you give a little gas, then blows warm..Does not matter if it's on defrost or floor, or vent.
Expert:  moparfl replied 5 years ago.
How did you check the blend door operation?
Customer: replied 5 years ago.
I watched the electric motor turn the door. There is no longer a clunk, but still same problem with heat. No heat unless slight acceleration to gas, warm air then blows through, stays like that until blower is shut off, or motor is shut off. Then same problem all over again. Customer wants to be able to warm up inside of truck, before taking off in the morning, but heat won't come unless gas is pushed....

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