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1994 Dodge Dakota Question: Heater will not blow hot.

 

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rbyard, 3.9L V6, Dallas, TX, February 03, 2014, 13:16
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I disconnected one heater hose at a time flow is good going to the heater core but return flow is weak. Do heater cores fail this way? It has usually been my experience that they develop a leak when they fail. Do they get stopped up? I have only had the truck for 9 months and have no idea how it was maintained before I got it(probably not well, it still had original PCV at 160k). I have replaced the thermostat and temp sensor because gauge didn't register.

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    G. T. Service Center (4142 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG February 03, 2014, 15:11
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    It sounds like the core is restricted, probably needs flushed, but without flushing the engine it might just stop up again.

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    rbyard, February 04, 2014, 08:22
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    Thank you for that answer. I assumed that might be the case. I will disconnect both hoses and flush the core. Sure hope it works, I do not want to remove half the dash to get to the core.

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    ProfessorG, February 04, 2014, 11:34
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    The core is not leaking so it should be sound, unless it can't be flushed clean.

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    rbyard, February 10, 2014, 11:56
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    Flushing the core worked great! Thank you for your help.

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    ProfessorG, February 10, 2014, 12:30
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    U Bet happy you're warm.

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  • Answer #2

    dakotaguy May 07, 2014, 19:44
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    disconnect both heater hoses and back flush /reverse with water under good pressure , i used a hose with nozzle turned to jet stream last time on my 93 dakota ,then some pore some clr into heaterhose ,gave a small shot of water to get it in heater core and let sit for a hour then repeated pressure reverse flush ,myh heater still cranks heat after a year

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