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Old 09-03-2019, 12:11 PM   #1
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Join Date: Dec 2018
Location: Rock Hill, SC
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Year: 1997
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Chassis: Vista 3600
Engine: DT466E / AT545
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3 Gauges For Coolant Temperature, Different Readings

Got a 1997 DT466E, no temperature issues but still have this oddity.

I have a scangauge2 that says a temperature of about 10-20 degrees above the dash gauge. I figured - "Side with the computer", however I slipped in a makeshift temperature sensor when working on the cooling system to check the values, and the sensor is siding more with the dash gauge than scangauge.

Sensor was reading coolant temps coming from the engine block going to the radiator.

Generally the scanaguags reads 200-210 while the dash gauge is sitting just over 180.
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Old 09-03-2019, 12:28 PM   #2
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are your temp sensors all in the same place? the water going from the head to the radiator is likely the hottest water you will find in the system. if you other gauge sensders are other locatrions in the water circuit then you are reading the water in other various states... ..


im assuming ytou have the older computers in your 466E? (your dash temp gauge reads a max of 230?).. the newer dash (with a 280 top) temp gauge simply uses the computer value and is notorious to be wrong..

-Christopher
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Old 09-03-2019, 05:21 PM   #3
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Year: 1997
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Chassis: Vista 3600
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Quote:
Originally Posted by cadillackid View Post
are your temp sensors all in the same place? the water going from the head to the radiator is likely the hottest water you will find in the system. if you other gauge sensders are other locatrions in the water circuit then you are reading the water in other various states... ..


im assuming ytou have the older computers in your 466E? (your dash temp gauge reads a max of 230?).. the newer dash (with a 280 top) temp gauge simply uses the computer value and is notorious to be wrong..

-Christopher
I'm not sure about the location of the other sensors, I assumed both scangauge and dash gauge were both pulling from ECM which was pulling data from a single sensor. The dash gauge is the older type that only goes to 230.

The third party sensor was at the head of the engine block, and was more in agreement with the dash gauge within a tolerance of 2-5 degrees.

I did find a sensor plug (but no sensor) in the coolant return pipe, I'll likely install a permanent one there as a tertiary sensor.
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