Question about 1998 Dodge Ram 1500 4WD
Heater not getting hot just flushed radiator
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
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Posted on Jan 02, 2017
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
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
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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