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Discussion Starter · #1 ·
I have a 2001 R/t with the 5.9, 118,00 miles. When the outside temp gets down to 30 I barely have any heat in the cabin. I replaced the thermostat, the engine temp seems to be where it should, and the hoses going to the heater core are hot. (one almost to hot to touch, the other somewhat cooler) It seems like it is only heating outside air and not recirculating and already warmed air from the cabin. Is this correct?
 

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Sounds like the blender door might not be operating properly. I would check to make sure the vacuum hoses to it are not broken or disconnected. I believe they can be found under the dash on the driver's side of the center console near the floor. Sadly, the heater core box is a big job to remove if you need to open it to repair the door.
 
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