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.

    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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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
  • 8,836 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

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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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