Heater Blows Cold Air!!!!????? - Dodge Cummins Diesel Forum

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post #1 of 7 (permalink) Old 01-16-2013, 07:15 PM Thread Starter
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Exclamation Heater Blows Cold Air!!!!?????

ok so my heater is blowin cold air threw all the vents at full blast. I flushed the heater core and it was flowing great. the heater core gets hot too. the air flows out fine and I "burped" the radiator. my temp guage works fine to its running at 200 degrees and it seemed like when I had the hood up and the heater on full blast that I could here the AC unit comin on... anyone kno what wrong?

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post #2 of 7 (permalink) Old 01-16-2013, 08:41 PM
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The flap/door that controls the air flow at the core is probably stuck or not connected to the control switch. So all you're getting is cold air from the A/C.

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post #3 of 7 (permalink) Old 01-16-2013, 09:23 PM Thread Starter
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ive looked all over the truck for a valve or something that could be stuck... where is it located and how do you fix it because I cant handle having no heat . the other day I drive 5 miles to work lookin through a grapefruit sized whole in my windshield because the de frost didn't work
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post #4 of 7 (permalink) Old 01-16-2013, 09:29 PM
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Its under your dash in the black box where the evaporator core and heater core are in. When I replaced my evaporator core, I had to make sure that door was connected properly and not stuck. The temperature control knob is mechanically operated. It is connected to a wire that opens and closes the door.

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post #5 of 7 (permalink) Old 01-16-2013, 09:48 PM
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It normal for A/C to come on in...

MAX A/C, A/C, Bi-Level, DEF-Floor and DEF

As for the cold air I would say there is only 2 things that cause this.

1. Bad stepper motor or damaged stepper motor shaft (heater treater)
2. Plugged heater core and both hoses are equally hot. Because if a heater is functional and working properly it should be colder on one hose.

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post #6 of 7 (permalink) Old 01-16-2013, 09:57 PM Thread Starter
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how do you get to it... there was a little black box under my heater core but when I poped the cover off it had "gears" in it. and as I turn my knob from cold to hot there was like a shaft in top of the little black gear box that moved a little but would stop in between hot and cold and not move any more .... is this the box where the valve is or what is it
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post #7 of 7 (permalink) Old 01-17-2013, 09:29 AM
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Here is what you should have...

The blend door should move back and forth with the control on the dash. With the stepper motor removed is the door jammed? Does the stepper motor move freely separated from the truck?

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