Heater not working??? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 7 (permalink) Old 12-07-2010, 01:08 AM Thread Starter
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Heater not working???

Just bought a 2000 Ram 3500 about 6 months ago and the heater has never worked. Anybody have any suggestions on where to start looking for a problem? Thanks
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post #2 of 7 (permalink) Old 12-07-2010, 02:37 AM
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Flush the cooling system. Sounds like your heater core is done, but try flushing the cooling system and see what happens. The truck does run in the operation range for coolant temp?

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post #3 of 7 (permalink) Old 12-07-2010, 10:43 AM
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You might also want to try just flushing the heater core. We did a full system flush on my buds truck once, and it improved the heating performance. Once we just disconnected the heater core hoses and flushed that only, it reached its full potential once again.

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post #4 of 7 (permalink) Old 12-16-2010, 06:49 PM
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Before you do anything, with the engine at full temp, touch both heater core hoses coming from the firewall. If the heater core is fine then they both will be hot. If only ones hot then the core is plugged. If they're both hot but you're still not getting heat then check the blend door for the heater under the dash. With the key in the ON position (truck not running), when you change the heater temp knob from warm to cool, listen down by the passenger floor and you should lightly hear the blend doors electric motor running as it swings the door one way or another.

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post #5 of 7 (permalink) Old 02-04-2011, 10:54 PM
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also chek your thermostad
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post #6 of 7 (permalink) Old 02-24-2011, 03:16 AM Thread Starter
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Replaced the heater core and it is working fine now. Thanks for the help.
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post #7 of 7 (permalink) Old 02-25-2011, 05:59 PM
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If you did not flush the cooling system multiple times so it is clean the new heater core will collect the crud in the system.

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