01 cummins heat problem - Dodge Cummins Diesel Forum

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post #1 of 6 (permalink) Old 03-16-2013, 01:47 AM Thread Starter
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01 cummins heat problem

Hey guys I know this topic has been beat up pretty bad. I'm trying to bring a used and abused 01 dodge cummins with 325000km back to life. In running into heater problems. I got the dash all apart and a new heater core on the way. My only question is how do I know the control switch is actually switching from hot to cold. The truck only blows luke warm air, but when switched to cold I does switch to cold. It's almost like the gate is only opening a quarter way. Either that or the core was plugged. But it's leaking anyway so needs replacing. I just don't wanna put I all back together and find out its just the air control switch, cause i aint taking it apart again ! Anyone know some trouble shooting ideas? Thanks in advance !


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post #2 of 6 (permalink) Old 03-17-2013, 12:17 AM
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your heater core will make a big dif. check your thermostat too jus my .02 i had to change my heatercore mine was so bad it actually wud fog coolant in the cab when i turned the heater on works great now dont no bout the switch part tho

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post #3 of 6 (permalink) Old 03-17-2013, 12:40 AM
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the blend door actuator motor is under the dash just right of the hump. I would make sure the blend door is swinging freely by hand with no restrictions prior to putting it back together. Also make sure your blend door motor is working properly rotating the blend door , they do fail fairly frequently.

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post #4 of 6 (permalink) Old 03-17-2013, 10:12 AM
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also if your in Canada (judging by use of KMs) do NOT install a spectra heater core, they are sold by most after market parts places, I have spent many hours chasing heat issues, they do not perform well, they are cheap 60-80$ vs 300 from dodge,
likely you will find the old one is plugged internally, and if you had a low air output from the vents the evap core will be plugged near solid with oily dirt, I will post a couple pics of this later.
also DO not use a MOTORAD or stant thermostat,as they wont direct hot coolant thru the heater core. (pics to follow) cummins wants near 130$!!!! for a thermostat, but it is amazing the difference in heat output.

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post #5 of 6 (permalink) Old 03-17-2013, 10:19 AM
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here is what my evap core looked like at 297,000kms



here is the difference between the stant and the OEM thermostat, the oem has the plate on the bottom, it directs coolant thru the core, while the non-plate thermo will regulate the temps properly, it will NOT give the same heat as the OEM, even though they will both get the engine to 195F..

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post #6 of 6 (permalink) Old 03-17-2013, 10:25 AM
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here is a thread where I posted some info, it should help clarify my above post

No Heat out of vents - Page 3 - Dodge Diesel - Diesel Truck Resource Forums

2003, QC/SB. Edge Juice,Hot, AirDog150/BMS50 nozzles S&B CAI, BD Flex plate/tripple loc T/C. georend VB/ Trans rebuilt by Me. Bilstien5100. carli coils, Air Bags. RETIRED Military Mechanic (20yrs)
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