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Dodge 1500 heater box doors #2416539
12/11/17 12:00 AM
12/11/17 12:00 AM
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Pgh, PA
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Bull1tt Offline OP
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2003 Dodge 1500, with no heat. Radiator full, both hoses were hot to touch. I took the dashboard apart to access box thinking one of my doors were broken, but it seems that all the actuators and doors are working. I drilled a one inch hole in the box to see if the center door was working, and it is. (the one actuator that has a rod connecting to a second lower door) I believe that these doors are for air temperature. If they are, then I’m looking at possible plugged heater core I guess. Anyone been here?

Re: Dodge 1500 heater box doors [Re: Bull1tt] #2416582
12/11/17 01:12 AM
12/11/17 01:12 AM
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Cotati, CA
Dave Hall Offline
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Yes. There was a previous post about an older car that worked fine with a heater core flush. It's worth a try because these heater cores should always be warm and the blend door forces the air over it. If your doors are all working as you say a flush should be the fix.

Re: Dodge 1500 heater box doors [Re: Bull1tt] #2416585
12/11/17 01:22 AM
12/11/17 01:22 AM
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Pgh, PA
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Bull1tt Offline OP
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I guess I’m going to drain the coolant and get a hose connected to find out! See if I can get water through.

Re: Dodge 1500 heater box doors [Re: Bull1tt] #2416587
12/11/17 01:25 AM
12/11/17 01:25 AM
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Cotati, CA
Dave Hall Offline
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If the heater core is plugged with crap it might be time for a whole cooling system R&R anyway. So...carry on...

Re: Dodge 1500 heater box doors [Re: Bull1tt] #2416670
12/11/17 08:05 AM
12/11/17 08:05 AM
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Mass
DAYCLONA Offline
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Originally Posted By Bull1tt
2003 Dodge 1500, with no heat. Radiator full, both hoses were hot to touch. I took the dashboard apart to access box thinking one of my doors were broken, but it seems that all the actuators and doors are working. I drilled a one inch hole in the box to see if the center door was working, and it is. (the one actuator that has a rod connecting to a second lower door) I believe that these doors are for air temperature. If they are, then I’m looking at possible plugged heater core I guess. Anyone been here?




Typical Dodge Ram problem, if it ain't the heat doors, then it's a clogged heater core, you might get lucky by back flushing the core with a garden hose...been there done this too many times with these trucks over the years, PITA

Re: Dodge 1500 heater box doors [Re: Bull1tt] #2416684
12/11/17 10:59 AM
12/11/17 10:59 AM
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Pgh, PA
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Bull1tt Offline OP
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Looks like that’s my next step... now that it’s freezing outside!

Re: Dodge 1500 heater box doors [Re: Bull1tt] #2416949
12/11/17 08:34 PM
12/11/17 08:34 PM
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Newport, Mi
Evil Spirit Offline
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Originally Posted By Bull1tt
2003 Dodge 1500, with no heat. Radiator full, both hoses were hot to touch.


On systems that do not regulate coolant flow to regulate heater temp -

If both the inlet and outlet heater cores hoses are hot, yet you have cold air out of the ducts, that tells you there is no airflow through the core. This is because if there was airflow thru the core, heat would transfer from the core to the blower air and the coolant outlet hose would get cooler. This is typical of an airdoor not working correctly.

With a properly working system, the hose should be hot going into the core, and slightly cooler coming out of it. The hot inlet shows there is coolant flow through the core, and the (only) slightly cooler outlets shows there is enough coolant flow to sustain heat, and heated air shows airflow across the core transferring heat to the air.

A hot hose going in, but a much colder one going out usually means you have a partially clogged heater core. There is not enough coolant flow to hot coolant in the core, so the airflow "overcools" the core. This typically shows warm air on low blower speed and goes to cold on hi speed.

Both hoses cold usually means a plugged core.


Free advice and worth every penny...
Factory trained Slinky rewinder.........
Re: Dodge 1500 heater box doors [Re: Bull1tt] #2416959
12/11/17 08:40 PM
12/11/17 08:40 PM
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Grand Prairie,Texas
stumpy Offline
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Both hoses can be hot and still not have flow through the core. Engine heat will gravitate through the water in both hoses.

Re: Dodge 1500 heater box doors [Re: DAYCLONA] #2416975
12/11/17 08:58 PM
12/11/17 08:58 PM
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Buford, GA
I_bleed_MOPAR Offline
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Originally Posted By DAYCLONA




Typical Dodge Ram problem, if it ain't the heat doors, then it's a clogged heater core, you might get lucky by back flushing the core with a garden hose...been there done this too many times with these trucks over the years, PITA


iagree

Just back-flushed my '00 Durango. Heat works great now. I couldn't believe the crap that came out (caught the first bit in a 2 gal. transparent bucket).
Be sure to back-flush in order to get it out. up



Tim

Last edited by I_bleed_MOPAR; 12/11/17 08:59 PM.

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