Dodge ram heater problem

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Old 10-24-12, 07:21 PM
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Dodge ram heater problem

I hope some one can help. I have a 2000 dodge ram 1500 4x4 5.9 I have change the thermostat and the heater core and still have poor heat in the cab the heater core hoses are hot going into the fire wall what else can it be ?
 
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Old 10-24-12, 08:51 PM
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Welcome to the forums and the world of diesel. Have you checked the small hose that comes off the vacuum pump to make sure it is attached. It operates your 4wd and heater ducting doors.....that's it. If it is detached or has a hole in it, it could affect the way the doors operate, and thusly the heat disbursement. Normally diesels run cooler than gas engines, so sometimes early on heat is a premium commodity.
If all that proves good, then it is highly possible the heater core itself is plugged. The use of radiator stop leak sometimes stops leaks in radiators, but ALWAYS messes with heater cores. You will need to flush it backwards. Determine the "in" hose, disconnect it and allow it to drip into a bucket. Then remove the "out" hose and connect a garden hose to it holding it tight with your hands. Most likely you will see gobs of crud come from the "in" hose, which is an indicator the core was stopped up.
 
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Old 10-24-12, 09:06 PM
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I'm sorry and forgot it is a gas engine sorry to waste ur time
 
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Old 10-25-12, 03:45 AM
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Oooh, yeah, I forgot, Dodge did make a 5.9 in gas that year. Sorry for not asking. No waste of time on my part. It still could be a vacuum leak not allowing the heater doors to operate properly, and the flush thing may hold true on the gas engine, too. Diesels are a positive pressure engine since it is turbo, so they had to add on a vacuum pump to operate things. With gas, it has it's own vacuum. Let us know about how your investigation goes.
 
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Old 10-25-12, 08:53 AM
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I can't remember if hot coolant always pumps through that heater core or if there's a valve on one of the heater hoses. If there's a valve then it might not be opening all of the way, and if there's a blend door then it might not be actuating all of the way, as in there could be an obstruction in there.
 
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Old 11-04-12, 05:52 PM
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Did you figure this out? If not you need to check under the glove box beside the tunnel. There is a small plastic part that actuates the blend door. These trucks are not on vacuum for the heat, it is electronic. There is a part called heater treater that replaces the plastic factory gear with a much better metal gear. More than likely that is what it is.

If you need heat you can go under the glove box and turn it manually, but it will probably only go full hot.
 
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