Re: Cooling system K2500 What's normal?

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Posted by R staaterman ( on 13:08:13 03/01/08

In Reply to: Re: Cooling system K2500 What's normal? posted by Ben

OK so in cold climate that's not unusual.

If it's running at 165-170 and then pops up to 195 perhaps the thermostat is stuck. I did not replace that.

The tranny got a BG flush 4 years ago and was filled with Mobil 1 ATF fluid.

Pumps was purchased at a GM truck dealer based upon Vin # so I kinda doubt that's an issue. I did not know there were different direction pumps.

Is there an easy way to check?

I did follow the affixed belt diagram when that, the tensioner and any idler bearings were replaced.


: 190*F is not that hot and is 'normal' if you have 180*F thermostat. Cold if you have the 195*F stat.
: Did you get the 'right' rotation pump? Remote but you could have gotten one for an older engine.
: Wide fluctuations says to me, either your thermostat is sticky (even new ones sometimes are no good) and/or your fan clutch is going bad.
: Another possibility is the auto tranny. It's ATF is cooled by the main radiator. When was the last time the ATF was flushed? Two schools on flushing ATF. One is often, other is if it's not been touched, leave it, as a flush 'might' loosen up debris and cause it to fail.

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