01 24v horrible MPG and no coolant temp?

[Blueox01]

Even pulling a 8K trailer in 110*F outside temps with a 190*F thermostat wasn't bad at all the temp got up to 205*F... No big deal here...

Just put iin my NW has humidity,dry heat in AZ,that's why all the old folks with arthitis go down there to live.

[AH64ID]

pulling a 16k load in 110 degree heat it probly worked,especially in the hills.

I doubt it! Even in hot hot days I haven't ever seen more than 10° above full open on my thermostat. So even if we assume it got 20° above full open on a 130° stat your barely to min operating temp and that's only going to be on long hills. The hardest the cooling system gets worked is in 6th gear, rpms are low, EGT's are high, airflow is down, oil is hot, and torque is high. As you gear down you reduce the strain on the cooling system, and at 24K+ gross hill are probably pulled in 4th gear, maybe 5th on small hills and you just don't have the strain you would at 18K GCW in 6th. I can't think of a single good reason to run a 130° stat!

[Blueox01]

I doubt it! Even in hot hot days I haven't ever seen more than 10° above full open on my thermostat. So even if we assume it got 20° above full open on a 130° stat your barely to min operating temp and that's only going to be on long hills. The hardest the cooling system gets worked is in 6th gear, rpms are low, EGT's are high, airflow is down, oil is hot, and torque is high. As you gear down you reduce the strain on the cooling system, and at 24K+ gross hill are probably pulled in 4th gear, maybe 5th on small hills and you just don't have the strain you would at 18K GCW in 6th. I can't think of a single good reason to run a 130° stat!

Then WHY does someone manufacture one for this engine?

[AH64ID]

Then WHY does someone manufacture one for this engine?

I cannot find a part number for it, but if it's made it is possibly for a different ISB, maybe even a natural gas version and a special application. It is not intended for any pickup motor.

[cajflynn]

Even pulling a 8K trailer in 110*F outside temps with a 190*F thermostat wasn't bad at all the temp got up to 205*F... No big deal here...

Maybe you should try 16k lbs then! I bet it gets hotter.

[flagmanruss]

Low thermostat likely has other applications. I'm familiar with marine engines, particularly Raw water cooled... salt / seawater would salt up at higher temps. I F'ed up a plow jeep with a marine thermostat... The next owner replaced the T-stat & all was well. Duhh!

[AH64ID]

Bringing up the old thread. I was recently reading some info on low temp after-cooled QSB's, they have a 165° thermostat in them, and the min full load operating temp is still 160°. I still can see where a 130° stat would be used on B series diesel motor, it must be a natural gas application.

[JOHNFAK]

I wouldnt mind a 200 degree tstatI swapped my oem out with a 170/175 (forget) .....but thinking going the other way (200) for non towing would help with mpg

[98whitelightnin]

My mpg's went up nearly 4mpg when I got my truck out of the 150-170 range and back to 190.

[JOHNFAK]

My mpg's went up nearly 4mpg when I got my truck out of the 150-170 range and back to 190.

For real ?? wow tstat ??

[98whitelightnin]

Just a 190 from napa. I will pm you.

[CUMMINSDIESELPWR]

For real ?? wow tstat ??

yep my friends auto i replaced the t-stat on his mpg went up about the same.