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2001 Dodge Ram Low heater output

Tiny
JDM89
  • MEMBER
  • 2001 DODGE RAM
  • 5.9L
  • V8
  • 4WD
  • AUTOMATIC
  • 211,191 MILES
My heater has low output at idle. But when the RPM's are raised, the heater output increases. Possible causes other than the blend door, it works perfect. Also, truck has new thermostat, radiator and thermostat housing. Both heater core hoses get hot.
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Sunday, November 8th, 2015 AT 2:48 PM

4 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Most likely the heater core is partially clogged with debris. You can flush it out with a garden hose. Work it back and forth until good and clear.

Roy
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Sunday, November 8th, 2015 AT 3:06 PM
Tiny
JDM89
  • MEMBER
  • 2 POSTS
This has been done twice. Burped the system 3 times. Previous owner replaced water pump back in January. This has drove me crazy.
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Sunday, November 8th, 2015 AT 3:08 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
It still may be a heater core. If it is clogged enough and will not clear it will restrict circulation

Roy
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Sunday, November 8th, 2015 AT 3:10 PM
Tiny
JDM89
  • MEMBER
  • 2 POSTS
The water flowed out good and clear as, well, water.
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Sunday, November 8th, 2015 AT 3:14 PM

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