Heater Problems - Diesel Bombers

24 Valve 2nd Gen Dodge Cummins 98.5-02 Discussion of 24 Valve 5.9 Liter Dodge Cummins Diesels with VP44 Injection Pumps
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Old 04-06-2010, 03:08 PM
Diesel Fan
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Join Date: Oct 2009
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Default Heater Problems

Im having problems with the heater in my 02 dodge 2500... it gets warm but not hot. Also i have an edge attitude with juice so i can watch my coolant temp. It usually gets to around 180 degrees but it also fluculates a lot. I have 100% antifreeze in it.. Help please..
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Old 04-06-2010, 04:01 PM
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Join Date: Oct 2009
Location: arizona
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might have a flow problem through your heater core itself the valve might not be opening all the way might have airflow problems through the heater core just a few things to check at that temp it should be plenty warm
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Old 04-06-2010, 04:45 PM
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Not really addressing your problem - but you shouldnt run 100% antifreeze/coolant. There needs to be some water in the system. 60% antifreeze & 40% water is about the max amount of antifreeze that you want to run.
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Old 04-06-2010, 08:39 PM
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Definitely cut that mixture of pure anitfreeze! That's probably your biggest problem. 50/50, or 60/40 are decent ratios. Mix it for your climate, most 50/50's will only gel at -34C. A 60/40 will take you down to -50C. If it doesn't get too cold, go 40/60, safe to aprox -28C or so.
Referring to flow, water flows easier than Glycol, it is thinner. Better flow may promote more heat into the heater core.
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Old 04-06-2010, 09:03 PM
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like said above cut it to 60/40 max

only other thing I can think is maybe the heater core has an airlock in it....after you cut the mix let the truck idle with the heater on and the hose that feeds the core pinch it with yer hand several times to create a surge and that may get the airlock out
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Old 04-07-2010, 10:23 AM
Diesel Fan
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Thanks guys the safternoon i will pump some antifreeze out i got to thinking thats the problem before i posted the first time. Thats what happens when you listen to your father
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Old 04-08-2010, 08:07 PM
Diesel Fan
Join Date: Dec 2009
Posts: 11

My 01 I bought back in December had that same problem. Truck has 200k on it. Had the heater core changed out as it was plugged and starting to leak. Also just replaced the ballast resistor for the heater motor. Now all works fine. Will have the A/C checked in the next couple weeks to make sure it is as cold as it should be.
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