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Virtual Wrench
Virtual Wrench, Dodge Mechanic
Category: Dodge
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Experience:  35 years Master Mechanic
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1996 Dodge Ram 2500 van: replaced thermostat..blown..heater core

Resolved Question:

Have 1996 Dodge Ram 2500 van Have replaced thermostat. (No A/C) Heater will only blown very little heat. Checked heater core line and heat is going thru to the Core.
Submitted: 9 years ago via
Category: Dodge
Expert:  Virtual Wrench replied 9 years ago.


Check the heater hoses at the heater core, both should be VERY hot to the touch, if one is hot and the other is cooler, the core is restricted. If they both are HOT, then its an issue with the temp blend door in the heater case assembly.



If you have further questions on this, please feel free to reply.

Thanks for asking!

Customer: replied 9 years ago.
The Heater core lines are both hot which told me coolant was going thru the core. I have checked the upper vent door which is open. I have also closed the lower vent door which allows a little more heat, however by the time the blower moves the air to the interior vents it is still cool air.
What have I missed or need to look at??
Expert:  Virtual Wrench replied 9 years ago.


Try adjusting the temp blend cable.




If you have further questions on this, please feel free to reply.


Customer: replied 9 years ago.
Thanks for the schematic's. I have checked the heater door vent cable assembly and it is working properly.. Sitting here thinking?
How would I check if the heater core is partially blocked ? Allowing only partial heat.
Expert:  Virtual Wrench replied 9 years ago.


Thats a tough one to test, but one thing for sure is its VERY comon for them to become restricted.

Sometimes you can try to flush the core by removing the heater hoses and rig up a garden hose and run water through it.

If it helps, then you know for sure its restricted,,,plus you will be able to see the volume of water that passes thru it.

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