Question about 1998 Dodge Ram 1500 4WD

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Radiator fluid is not heating up /all componennts are working

Heater not getting hot just flushed radiator

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  • Jeremy W.
    Jeremy W. Feb 10, 2012

    was it working before you flushed the radiator?



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  • Dodge Master
  • 76,846 Answers

Do the two heater core supply hoses get hot where they go through the firewall to the heater core? If one is hot the other cool to the touch then you have a plugged heater core flush it out with a garden hose, if they are both hot then a part called the air temperature control blend door is not moving inside the air ducting due to it being warped and jammed and/or the actuator that moves it being defective, to replace the blend door and its actuator requires the dash be removed from the truck to access the air ducting that contains the blend door.

Posted on Feb 10, 2012

  • Jeremy W.
    Jeremy W. Feb 10, 2012

    what if it iis as simple as an air pocket left in the system after flushing the radiator?

  • yadayada
    yadayada Feb 10, 2012

    I don't think an air pocket is an issue on this engine due to the fact the radiator is higher than the engine. It should self bleed.



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Posted on Jan 02, 2017

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SOURCE: Heater not working correctly

you might have a blocked heater core,the core looks like a mini radiater

Posted on Dec 18, 2008

  • 39 Answers

SOURCE: Cool air blowing from heater, even when on high.

if the heater core is bad, it will leak or not flow water. even tho you can "hear" the blend door working, it may not be actually moving inside the box. check to see if the actuator is connectd to the blend air door. You may be hearing the actuator moving but not the door.

Posted on Nov 22, 2008

  • 1055 Answers

SOURCE: heater doesnt get hot

is their a control valve in the heaater hose?
if so it could be stuck

Posted on Mar 04, 2009

  • 7353 Answers

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

  • 1111 Answers

SOURCE: I have a 98 dodge 1500 5.9 with 180k.Changed the

your sure you installed thermostat correctly and no leaks around it ...are both top and bottom hoses hot going into and out of the heater-core and all fluid temps are at specified levels ...
you may also have an air bubble which when back-flushing may occur was the vehicle getting heat prior to reinstalling another thermostat / and while fluid was replaced into the radiator circulation /flow of exchange from the motorto the radiator are presenty working no vacuum lines are dry-rotted causing a vacuum leak ..hmmm you can hear the heater flaps open and change from the dash defrost to floor to vents etc ok that sounds like its working but check with the cap off to the radiator for proper fluid levels and that the fluid is exchanging and both the top and botto hose into and out the firewall are hot if the top is hot and the bottom one is coldyou may still have a lot of sediment /gunk in the core itself and reflushing the core is required and remember not to use full force when doing so or you risk rupture to the unit /core with the motor off remove the 2 hoses face the bottom or top on towards the catch pan because its illegal to disburse it onto the ground and whether your back flushing it or just running the water through you will also dislodge the air bubble as it fills with water after your sure the above is all looked into check to ensure the flow of fluid is present ...this is my starting point on your issue ...

Posted on Dec 16, 2009

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A few things to consider when diagnosing poor heater
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  • How hot is the engine actually getting? If the thermostat is stuck open the engine may never reach proper operating temperature.
  • With the engine at operating temperature feel the hoses going into the heater core, are they hot? Some vehicles use a heater control valve that only flows coolant through the heater core when activated. They work off of vacuum and it isn't uncommon to find a broken vacuum line at the valve.
  • Are the doors in the heater box operating correctly? Can you hear the heater door inside the dash open when you select heat?
I hope this helps in getting your heat to work for the upcoming season.

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