Question about 1998 Dodge Ram 1500 4WD

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Heat does not come on when truck is not moving 2002 Dodge Ram

2002 Dodge Ram heat does not come on when truck is not moving. When trruck moves the heat is very good. Was having heating problems, 1st thing that was done was to replace the thermostat, which I did & that did not fix the problem. 2nd thing that was done was to check & see of the heater core was stopped up and noticed that the right side of the radiator & the top hose was hot while the left side & the bottom hose remained cold. I was told that I needed to replace the radiator, so I replaced the radiator, this also did not fix the problem. PLEASE HELP I'm at a loss

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  • Janice Hackney Jan 18, 2009

    Motor1258 Yes, we took hoses loose to the heater core and blew air through it, so there were no clogs there

  • Janice Hackney Jan 18, 2009

    adrake250 thank you, we will give that a try

  • Janice Hackney Jan 18, 2009

    adrake250 thank you, we will give that a try

  • bsobotka Jan 26, 2009

    I am having the same issue.  Were you able to resolve the problem?  What was estimated cost?

  • Anonymous Feb 02, 2009

    my blend door shaft is broken near the actuator arm behind the air bag controller do i need a new evaporator case? can i repair it without replacing case and just replace blend door?

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  • Dodge Master
  • 6,674 Answers

So have you had heater core flushed, or tried to do your own flush on it yet? Just for your reference in future, when coolant reaches 190F approx depending on thermostat setting & thermostat opens, hot coolant from engine returns to rad for cooling via top hose, and cooled down coolant , from bottom of rad flows back through system, and process starts all over again. That said, it is not uncommon for it to feel cool at idle, because with any restriction in heater core from calcium, whatever, it needs that little extra RPM's to push it through better, increasing the flow, thus better flow, better heat. If you decide to do it yourself, let me know, otherwise have rad shop flush system, core & reverse flush core also, it tends to flush out more debris that way. It may not be like new, but should be much better.

Posted on Jan 18, 2009

  • Mike Butler
    Mike Butler Jan 19, 2009

    Feel your heater hoses going in to firewall, with heater on. Get engine up to operating temperature. Feel at idle, both hoses, and note. Now have someone rev engine a little & hold the rpm for a few seconds, and feel them. If they feel quite a bit hotter, you have a flow problem.

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  • 31 Answers

You need to get under the dash board and remove the passenger lower kick panel. ther will be a small motor bolted into the evaporator housing. remove it and manually move the blend door. if the heat gets hot the you need a blend door actuator.

Posted on Jan 18, 2009

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