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Old 07-09-2018, 12:17 AM   #1
MikeAlexander
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Join Date: Jul 2018
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Default 2014 Tahoe over heating on grades?

When pulling my trailer with my Tahoe I have been experiencing over heating on long grades 6% more then 5 miles long.
Owners manual does say 250 degrees that is when to cool the truck down. But 250 seems way to high.
Trailer curb wait is 2700lbs, loaded I assume 3700. Well under the 5000lbs Tahoe rating.

Please note that the coolant gage is faulty. The following comes from my mechanic:
The dash gage will show 210 degrees and with my mechanics OBDII connected the reading is 180 degrees.
As temperature rises the gage does not move until the OBDII reads 218.
So the dash gage sits at 210 while the temperature fluctuates between 180 218, a 38 degree difference.

During our trip the normal operating coolant temperature is 199.3 (Torque ODBII app reading) while outside air temperature was 99 degrees, at a speed of 65 mph.

Example:
Up Sherwin (North of Bishop to Mammoth Lakes) a 6% grade & 7 miles long using Torque android auto OBDII.
Coolant temperature spiked to 233 degrees (Torque reading) and pulled over to lower the temperature
o Outside temperature was 79 degrees
High speed radiator fan did not engage on the grade
o High speed radiator fan did engage later, parked engine running
Note: Previous October did not exceed 210 degrees with outside temperature the same
Questions:
Do I have intermittent high speed radiator fan actuation?
What temperature does the high speed fan activate?
Can the sensor that turns on high speed fan be replace with a lower temperature rating?
What is the best course of action to resolve the overheating on grades?
Is it really a heating issue and I have no worries?
Thoughts?
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