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engine runs cold when idling after replacing radiator

i recently replaced my radiator in my 04-kw w900l, almost immediately i noticed the engine temp will drop to 110-130 degrees when i idle for even short periods of time. replaced thermostat-180 and temp sending unit and still the same thing. 1,040.000 miles ISX-475 hp

I have always had issues with the thermostat in this truck and have replaced them at least 3 times in 5yrs. seems any change in outside temp they stick or anytime I drain the coolant for ie, water pump,etc.

any ideas?

Is this not a problem? But I fear what it will be like in the winter!

Answer this question I have this problem too

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did you check if the coolant is really that cold with a thermometer?

to see if the guage is true?

did the system get burped (ran with rad cap off to remove air)?

any scale in the system? scale can keep the stat open slightly.

did any look into the settings in the ECM ?

Now i had a 3406E and stat houseing was a few thou oversize and that was enough for the coolant to slip past the stats and lower the the presure..thus causing the temp to be way lower ...

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Is the engine fan on, or does it stay on?

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yes the fan runs more with the a/c on but not continuous, cycles on and off like normal, some have told me it's because the a/c will make the fan run more.

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not sure if the isx has a coolant bypass system.. it maybe stuck open.

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I will check into this, thanks

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If you idle with AC on, the fan will go on when grill-denser needs cooling. If you want the engine operating temp at 180 kick up the idle to 1000 rpms.

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kodiak7180 will be eternally grateful.
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