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Why does my heater blow cold air?

Tiny
JTOY
  • MEMBER
  • 2008 DODGE AVENGER
  • 77,000 MILES
My 2008 Dodge Avenger blows cold air when the heater is on, does this car have a climate control module or what could be causing this problem?

I have checked the coolant level and it is fine. The hoses also get hot, but the heater blows cold within 2 - 3 minutes after you turn on the blower. If you turn the blower off for a couple of minutes it will be warm air again for just 2 - 3 mins

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Sunday, September 11th, 2011 AT 9:43 PM

4 Replies

Tiny
PROMECHANIC
  • MECHANIC
  • 536 POSTS
Did you check the coolant level in the radiator and the reservoir? I would check both and add some if it will take any. If it is good then you are looking at possibly a restriction in the coolant hoses or heater core. It could also be a problem with the blend doors or actuators.

Here is a link that will help

https://www.2carpros.com/articles/car-heater-not-working

Please let us know happens so it will help others.

Best, Ken

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Sunday, September 11th, 2011 AT 10:02 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Seems the blend air doors are not operating correctly and a scan tool is required to check for trouble codes.
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Sunday, September 11th, 2011 AT 10:05 PM
Tiny
JTOY
  • MEMBER
  • 3 POSTS
I do not have a check engine light, but I do have a scan tool.
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Friday, September 16th, 2011 AT 10:20 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
The scan tool must be able to retrive B and U codes. It would not trigger the MIL as this is a separate system.
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Saturday, September 17th, 2011 AT 11:12 AM

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