'Normal' operating temp

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01-05-2007, 03:36 PM

#16

macattack_ga

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Quote:

Originally Posted by infidel

You worry about nothing

Cummins says,

THE COOLING SYSTEM USED ON THE CUMMINS DIESEL ENGINE EQUIPPED VEHICLES PROVIDES THE CAPACITY AND PROTECTION OF THE HIGHER GVWR AND GCWR RATINGS AVAILABLE ON THESE VEHICLES. OWNERS SHOULD BE ADVISED OF THE NORMAL SLOWER WARM UP AND LOWER ENGINE OPERATING TEMPERATURES ASSOCIATED WITH DIESEL ENGINES.

Sounds OK to me

Quote:

Originally Posted by infidel

THE COOLANT TEMPERATURE GAUGE WILL FLUCTUATE ON DIESEL ENGINE EQUIPPED VEHICLES. IT IS INFLUENCED BY VEHICLE LOAD, OUTSIDE AMBIENT TEMPERATURE AND EXTENDED IDLE TIME. THIS FUNCTION IS CONSIDERED NORMAL
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This doesn't explain the coolant temperature fluctuations I'm seeing.

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01-05-2007, 07:05 PM

#17

infidel

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Quote:

Originally Posted by macattack_ga

This doesn't explain the coolant temperature fluctuations I'm seeing.

What's happening is that the cooling system is designed for heavy loads, it's very large for a pickup. T-stat is closed, air is still flowing though the radiator, coolant in the radiator getting colder, engine coolant getting warmer till the stat opens and gives a big shot of very cool coolant to the engine, gauge drops, the stat closes, temps start rising again. The cycle keeps going on and on...
If it didn't do this then when you got on a hill with a heavy load the cooling system wouldn't be adequate.
I ran an oil temp gauge for awhile, it stayed rock steady even when the coolant temp was going up and down. This indicates to me that metal of the engine is staying a pretty constant temp even though the coolant gauge is going up and down.