Question about 1999 Dodge Durango

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Heater blows coolant on windshield - 1999 Dodge Durango

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  • cheap repair Oct 05, 2010

    it sounds like your heater core has sprung a leak. The repair involves removing the dash.
    http://dodgeforum.com/forum/1st-gen-dura...

    not really a do it yourself job.

  • cheap repair Oct 05, 2010

    you can loop the heater hoses in the engine compartment to bypass the heater until a proper repair can be made. This will keep you on the road

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  • Contributor
  • 33 Answers

Sounds as though you have a bad heater core. is it leaking on the floor? I would bring it to a technician and have them pressurize the system

Posted on Oct 05, 2010

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  • Dodge Master
  • 7,704 Answers

Replace heater core. Let us know if you want DIY instructions--big job.

Posted on Oct 05, 2010

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Posted on Jan 02, 2017

  • 98 Answers

SOURCE: Heater / A-C only blows on windshield (defrost only)

Most all late model vehicles have heater controls that are vacuum controlled. Chances are that you have a vacuum line that has either come loose, or ruptured causing a leak that will not allow the selector flap to move back and forth. If you can acquire a vacuum routing chart (sometimes these are printed on stickers located inside the hood), then routing this particular line and spotting the leak shouldn't be too much of a hassle. If you find out that your heater selector is mechanical, then there is most likely a small plastic clip that has broken causing the mechanical rod that adjusts the flap to came loose. Either way, whether vacuum or mechanical, it sounds like your selector flap isn't moving. That's what I would check first and foremost. Hope this solves your issue. Have a great day!

Posted on Nov 23, 2008

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1 Answer

Turn on power to heater & nothing but the power light comes on, please help


There's a heater core box where radiator coolant passes through. When you turn on the heater, the fan on the heater core box blows air through the core, then the air is heated up and it passes through the air ducts, which leads to the windshield defroster, the vents, or your feet depending on where you set the control. If you're not feeling heat, either the fan on the heater core box is not working, or there's restriction on the coolant hoses and hot coolant isn't passing through the heater core box. Remove and diagnose the heater core box to ascertain the coolant lines are not blocked and the fan is fully operational. If the heater core box is OK, then the hoses have restriction to prevent hot coolant from passing through the heater core box.
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If you feel warm air blowing up on your windshield and If your heater is working, I would guess its a coolant leak, probably the heater core. Usually a coolant leak will leave a kind of "greasy" fog that is more difficult to wipe off. It is basically steam coating your windows. You should be able to smell coolant if its leaking.
If no warm air is blowing, I would guess an issue with your heater control module or a vacuum problem of not supplying vacuum to move the plenum door.

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