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Heater not working correctly?

Tiny
TTENN
  • MEMBER
  • 1 POST
  • 2001 DODGE DURANGO
  • V8
  • 2WD
  • AUTOMATIC
  • 146,000 MILES
The front heater will blow warm air after vehicle is warmed up and only on fan speed 1. If you turn it up any higher it blows cold air as if the heater core is not getting hot enough, have recently replaced radiator and headgaskets due to headgaskets blown. Had a shop do this. Also the rear heat does not work it blows outside temp air all the time. Please help me with this situation. Thank you in advance.
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Thursday, August 6th, 2020 AT 10:57 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Are you sure the coolant is full? Also, with the engine hot, running and the heater on, do both heater core hoses get hot?
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Thursday, August 6th, 2020 AT 10:57 AM (Merged)
Tiny
IFLYFL340
  • MEMBER
  • 2 POSTS
Well mine is also doing this but on speed 2 any higher blows warm then cold the upper heater core hose is hot the lower is warm anyone that can help please with a post or

call me at 918-409-3758 anytime
thanks
nick
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Thursday, August 6th, 2020 AT 10:57 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
It is normal for the return to be a little cooler, but does it feel like the coolant may be taking too long to get through because the core is plugged? If not, have you checked the blend door?
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Thursday, August 6th, 2020 AT 10:57 AM (Merged)
Tiny
IFLYFL340
  • MEMBER
  • 2 POSTS
Good? Where is the blend door at I looked under where the wipers are and there is a big hole for where the fresh air I guess would enter at but I got no clue where the blend air doors is
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Thursday, August 6th, 2020 AT 10:57 AM (Merged)
Tiny
YOGITBEAR
  • MEMBER
  • 1 POST
  • 2001 DODGE DURANGO
  • V8
  • 4WD
  • AUTOMATIC
  • 120,200 MILES
Has heater in front and one in the rear the rear has only cold air coming out when turned on no heat comes out but front one has heat?
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Thursday, August 6th, 2020 AT 10:57 AM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Hello,

It sounds like the blend door actuator in the rear is not working here is a guide to elp walk you through the repair on a similar car.

https://www.2carpros.com/articles/replace-blend-door-motor

Please run down this guide and report back.

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Thursday, August 6th, 2020 AT 10:57 AM (Merged)

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