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Old 05-16-2014, 05:23 PM   #1
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Hot and cool radiator

I have a 2005 Neptune and recently had the serpentine belt, Tstat, coolant, and radiator cap replaced. I also washed the rad from front to back. My question is this: the radiator is very hot and in some areas very cool after driving, is this normal. Should it be hot only, cool only, or both?
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Old 05-16-2014, 05:27 PM   #2
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Is that hot by feel or hot by the gauge?
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Old 05-16-2014, 05:37 PM   #3
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The gauge that I use is VMS on my computer and the range was 189 to 195. The Tstat that was put in was 190 I believe
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Old 05-16-2014, 05:38 PM   #4
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Sorry I forgot to mention, hot and cool by feel
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Old 05-16-2014, 10:49 PM   #5
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I would guess the cooling system has air in it = air-locked. Today's vehicle cooling systems are closed, no leaks or spills onto the ground. Most have a high-point air bleed device, whether it be a bolt to be loosened, or other means, on the engine. Often all it takes is several heating and cooling cycles to purge the air from the system if there isn't much air in the system. Be very careful not to overheat the engine if you choose to operate the engine trying to evacuate the air that way though, hot spots can ruin your engine if coolant is trapped by an air lock.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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Old 05-17-2014, 03:21 AM   #6
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That used to be the way you found a plugged radiator. The cool parts did not get hot coolant flow. I don't know about the new stuff
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