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Jerry, Master Mechanic
Category: Dodge
Satisfied Customers: 1754
Experience:  ASE Master tech, 30 years exp. troubleshooter, driveability tech
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2002 dodge 1500- heater blows strong- will not defrost

Customer Question

Customer: 2002 dodge 1500- heater blows strong- will not defrost windshield completely on cold mornings and blows cool air/not hot after warming up for 45 min in morning - will get warm if blower off and cools off as soon as fan blower turned up- have replaced thermostat and radiator which had small leak- replaced blend door approx 1 year ago - heater hose appears warm ? temp seems OK - truck will act like a normal Dodge and heater will blow very hot later in the day after being driven Thanks Tim
JA: Thanks. Can you give me any more details about your issue?
Customer: Owned truck since new- heater worked fine(very hot) until late last winter- blower stared making noise and heater taking long time to defrost-discovered blend air door malfunction - replaced & assumed heater issue was low air flow due to blend blocking vent- on 20 degree morning after idle for 45 min. windshield will only be 1/2 defrosted and side windows still frosty - air temp at vent not very warm with temp set on high - changed blower from defrost to dash - air temp still cool - turned blower off- air temp increases and cools down if blower turned on high-checked freon in compressor/good- put cardboard in front of radiator/ no change - also installed new water pump when radiator changed- stumped as to what can cause this - heater core?- heater controls? - how to diagnose problem - heater gets very hot later after being driven
JA: OK got it. Last thing — JustAnswer charges a fee (generally around $18) to post your type of question to Dodge Experts (you only pay if satisfied). There are a couple customers ahead of you. Are you willing to wait a bit?
Customer: yes i can wait thanks Tim
JA: OK. Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 1 year ago.
Category: Dodge
Expert:  -Brad- replied 1 year ago.

Good afternoon and welcome to JustAnswer!!

If both heater hoses are equally hot then your issue is in the HVAC and likely a blend door or actuator issue.. But if the heater hoses are not equally hot or one is cooler then you have a circulation issue.. Have you tried flushing the heater core with a garden hose?