No heat when attempting to defrost?

1999 DODGE CARAVAN
158,000 MILES • 3.0L • 6 CYL • 2WD • AUTOMATIC
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DANMOODY
Moisture builds up on interior surfaces on windows.
Jan 25, 2025 at 11:58 AM
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STRAILER
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
Do you have heat when the heater is on? So, the problem is no heat at all, or no heat only while in defrost mode? Please go over this video to start:

https://www.youtube.com/watch?v=SNRb6pSwYuU

I would check the coolant level first. Please give us more information so we can help you.
Jan 27, 2025 at 9:51 AM
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DANMOODY
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Plenty of coolant.
No heat/defrost when heater is on.
AC not in play
Jan 28, 2025 at 4:58 PM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,503 POSTS
  • ASE Certified Mechanic
Okay, I assume you don't have any heat with the hater on as well. I would remove the mode actuator and work the blend door by hand to see if you get heat at the defroster. If the actuator is weak it will not move the controls completely. Here is the location, let me know what happens.
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Jan 29, 2025 at 8:39 AM
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