No heat when attempting to defrost?

Tiny
DANMOODY
  • MEMBER
  • 1999 DODGE CARAVAN
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 158,000 MILES
Moisture builds up on interior surfaces on windows.
Saturday, January 25th, 2025 AT 11:58 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,584 POSTS
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.
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Monday, January 27th, 2025 AT 9:51 AM
Tiny
DANMOODY
  • MEMBER
  • 2 POSTS
Plenty of coolant.
No heat/defrost when heater is on.
AC not in play
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Tuesday, January 28th, 2025 AT 4:58 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,584 POSTS
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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Wednesday, January 29th, 2025 AT 8:39 AM

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