2003 5.9 running hot - Diesel Bombers

5.9 Liter CR Dodge Cummins 03-07 Discussion of 5.9 Liter Dodge Cummins Diesels with Common Rail Injection

2003 5.9 running hot

  #1  
Old 10-25-2018, 07:49 AM
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Default 2003 5.9 running hot


Hey guys, I have a 2003 5.9 that is running hotter than it use to. Running down the highway at 70-75 It gets to around 215-220 degrees unloaded. Iíve put a new thermostat, and fan clutch and there is no change in temp. I changed the antifreeze in the past 20,000 miles. The truck is stock and use to run around 200 no matter what. What else am I missing? Iíve checked the coolant and it is not leaking coolant either. Do yíall have any suggestions?
 
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Old 10-27-2018, 01:14 PM
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clean your rads out.you have no air flow.
 
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Old 10-27-2018, 01:20 PM
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Originally Posted by chopforman View Post
clean your rads out.you have no air flow.
what do do you mean by rads?
 
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Old 10-27-2018, 01:29 PM
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radiator, a/c condenser and tranny cooler
there need to be wash out or air blow threw them
 
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Old 10-27-2018, 08:08 PM
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how did you make out?
 
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Old 10-27-2018, 09:49 PM
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Man, didnít get to it today due to work. Should tomorrow or Monday. Iíll let you know. Thanks for the reply
 
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Old 10-28-2018, 08:50 PM
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Radiator and condenser are clean. Can you think of anything else?
 
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Old 10-29-2018, 07:47 PM
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the other thing you could do is pull your rad and take to a rad shop and get checked out
 
  #9  
Old 10-29-2018, 07:49 PM
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or try another thermostat . maybe that one is no good
 
  #10  
Old 10-31-2018, 06:44 PM
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I talked to my diesel buddy he said take the rad to rad shop and get a flow test done to it
You have a rad problen
 

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