Question about 1999 Dodge Dakota

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Blows warm air when idle but cold air when driving/change heater core themostate

Hoses haven't been changed since has truck,this is Michigan NEED HEAT IN THE TRUCK? flushed with water hole this time last year; also replace water pump and clutch fan last year

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  • Dodge Master
  • 44,335 Answers

I would check the operation of the thermostat in the engine . I suspect it is not operating correctly hence the variation of heater temp

Posted on Jan 21, 2013

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Posted on Jan 02, 2017

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SOURCE: 2002 dodge 1500 Changed radiator, thermostat, and hoses. No heat

Why was radiator replaced?Did it have heat before ? If it was plugged, the heater core may also be plugged. Try flushing it with a water hose in both directions. I dont know why the botton radiator hose would be cold, the radiator should be a uniform temp and the air coming through the radiator should be HOT, when the engine is at operating temp. What condition was the old coolant? if it was rusty, the water pump may have lower flow than normal.

Posted on Nov 19, 2009

  • 50 Answers

SOURCE: CHANGED THERMOSTAT, BACKFLUSHED HEATER CORE, NEW

You might have air in the lines, go ahead and find out if there is a bleeder valve. If so then bleed it after warmed up but watch out that steam is hot.

Posted on Jan 03, 2010

  • 1206 Answers

SOURCE: 2000 Dodge Ram Heat not hot, only luke warm @ idle

did you use pure antifreeze if so remove it all and add a 50/50 mixture because antifreeze will not heat up good if its pure. needs water to allow good heat.

Posted on Jan 05, 2010

  • 172 Answers

SOURCE: I have a 1998 Dodge Dakota 5.2/ V8 4X4 and was

Check the coolant flow control valve which should be located next to the heater core. It may be electrically or mechanically controlled. After you get the blend door and housing off and can access the heater core, bring your engine up to operating temperature, check that the coolant flow control valve works and see if the heater core heats up. If not it will be either plugged or a low coolant situation. You do not need to change out the evaporator, however it may not hurt to clean it externally with a condenser cleaner such as nubrite, and blow out with air. This would be a good time to change your cabin air filter also.

Posted on Jan 15, 2010

j_del
  • 1586 Answers

SOURCE: BOTTOM RAD HOSE COLD TOP HOT. ENGINE TEMP ABOUT

Did you burp the air out of the system after changing those parts? It sounds like the thermostat isn't opening which is why the lower hose is still cold. Click my screenname, go to my tips and tricks, and choose the one about burping the cooling system - it may help you out.

Posted on Jan 28, 2010

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