Question about 1998 Dodge Ram 1500 4WD

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Heater wont get hot

When the truck is up to heat and the heater is on the hottest setting it only blows warm air. I have changed the thermostat and no luck and some times when you change it to the floor and then back to vent it stays on the floor.It use to get real hot but not anymore please help its cold

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  • David Johnson
    David Johnson May 11, 2010

    This sounds like a vacumn problem to me. I would check all the vacumn system for leaks first,espacially under the dash, most leaks you can hear if you listen cloesly, hope this might help you, if not let me know more info.

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It has a valve on the heater hoses on one hose that has a vacuum line running to it check both sides of the hose on each side of the valve if its hot both sides its ok. Then check to see if both hoses are hot this will mean that the water is flowing ok if its not reverse the hoses on the heater core somehow it will flush the core out. If this is all working then its the door on you heater box not closing the air conditioning hole off . It goes through the same vents as heater

Posted on Dec 16, 2008

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Posted on Jan 02, 2017

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