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Heating & Cooling 2nd Gen Dodge Ram Heating & Cooling Problems and Questions.


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  #1  
Old 01-04-2013, 09:24 PM
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Default Yet Another Ram Heating Problem ....

Hey guys

I know there are a million threads already about this problem, but I can't seem to find one with my set of issues. The heat in my truck is barely functioning (brings temperature up to maybe 45 degrees). Water circulation is 100% good, with a new radiator and a new water pump and both the send and return line from the heater core are warm, so I know it's not clogged. This led me believe it was a blend door issue or a relay issue. I took the relay out and manually turned the blend door to be 100% heat and still I get nothing more than barely luke warm. I can't imagine it being a heater core with the warm water entering and leaving. I'm out of ideas and I live in a cold Pennsylvania town lol

Thanks!
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Old 01-04-2013, 10:15 PM
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Try the heater resistor
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Old 01-05-2013, 11:25 AM
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Default

Thanks for the quick response! What exactly is the function of the blower motor resistor? (sorry, I'm kinda an idiot with this) I'm assuming that controls the fan speed/on and off function
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Old 01-05-2013, 11:41 AM
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Quote:
Originally Posted by alexbeitzel View Post
Hey guys

I know there are a million threads already about this problem, but I can't seem to find one with my set of issues. The heat in my truck is barely functioning (brings temperature up to maybe 45 degrees). Water circulation is 100% good, with a new radiator and a new water pump and both the send and return line from the heater core are warm, so I know it's not clogged. This led me believe it was a blend door issue or a relay issue. I took the relay out and manually turned the blend door to be 100% heat and still I get nothing more than barely luke warm. I can't imagine it being a heater core with the warm water entering and leaving. I'm out of ideas and I live in a cold Pennsylvania town lol

Thanks!
Since you say the heater hoses are warm (and not hot) and haven't said whether or not you're certain it isn't a thermostat problem, I would suspect a stuck open stat. If you still have poor heating after you verify a properly functioning stat, I would think the heater core is at least partially clogged. You can try disconnecting the hoses and back flushing it with a water hose, but if the stoppage is bad enough, core replacement is your only option.
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Old 01-05-2013, 01:18 PM
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I did replace the thermostat a while ago, but they're cheap enough I'll just buy one and put a new one in. I flushed the heater core a month ago and it's definitely not clogged. I'll put a new thermostat in though. Thanks for the suggestion!
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Old 01-11-2013, 03:56 PM
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The resistor senses the temperature etc...

It's located under the dash on the passenger's floorboard area (where their left toe would be).

It's held in with 2 7mm bolts (I think) and has a 5 wire plug that you can see.

It's a common problem and just stops the heat fro working when everything else seems fine. Sorry it took me so long to get back.
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Old 01-11-2013, 04:04 PM
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Using a 190 degree thermostat could cure the problem
the Resister may need a couple shots of CRC Letric Clean, or something similar
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