Jack of all trades, absolutely master of none! Too many projects, not enough time and limited funds.
Geronimo, Guadalupe County, Texas
1993 K1500 Suburban - SBC Refit retraining the TBI and Computer Control.
2004 Z66 Avalanche 5;3 to 6.0 LQ9 upgrade - project pending
Hi tlr, so several reasons for the thermostat change:
the engine oil, transmission oil and coolant are tied into the same radiator so everything then runs hot,
im running a cast iron big block which generates a ton of heat, this degrades the oil and kills bearings
any oil i put in looks vaporized when i change it and
i plan on towing my trailer with this truck so i want to try and run it as cool as possible.
Live like you're on vacation
Those fan-on settings are too cold for any thermostat, even the 160°F thermostat. Once a thermostat opens it should not open and close chronically; it should open wide and stay wide open til the powertrain is done working.160°F thermostats are fully closed below 160°F, and fully open by about 176°F.
If you want the fans CONSTANTLY on for some strange reason? Fan-OFF @ 160°F or less.
With a 160°F / 71°C thermostat:
Set the Fan-OFF @ 176°F / 80°C. Any lower and the thermostat will stutter.
Set the Fan-ON @ 185°F / 85°C. This might let the fans shut off while the vehicle is moving fast enough to do the fan's work for them (45MpH or more).
Be sure the radiator (and external ATF cooler if also equipped?) are getting as much airflow into them as possible so that the fans' work is made easier.
Check your baffling, and consider adding coroplast in choice spots if need be.
THEY are NOT Lying to You.
You are NOT Even Lying to Yourself.
You ARE Being Lied to ... by Your SELF.
The Last Psychiatrist, aka ... Alone ...
thank you to everyone who replied, all great info, i would also like to thank the ppl who examined and corrected my tune file I will test the fans soon,
Last edited by 780ripper; 03-13-2021 at 07:51 AM.
Live like you're on vacation
new 160F thermostat is in, i drilled a small bypass hole in it and the truck runs great, way cooler than before, now i just have to re-flash the pcm with the new fan control temps
Live like you're on vacation
Too much of a temperature cycle when you stop for me. With a 170°F thermostat my low speed comes on at 178°F and I have it set to turn the fans off at 176°F. I keep the on/off settings close because once the water starts to cool off at the coolant temp sensor the fans have already run long enough. It tends to run within a few degrees of 180. Like 178-182°F.
Jack of all trades, absolutely master of none! Too many projects, not enough time and limited funds.
Geronimo, Guadalupe County, Texas
1993 K1500 Suburban - SBC Refit retraining the TBI and Computer Control.
2004 Z66 Avalanche 5;3 to 6.0 LQ9 upgrade - project pending
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