>> Overheating Water Temp & Tranny Temp <<
 

Thank you in advance to anyone whom spends the time responding.

2011 Lariat 5.0 FX4
160,000 miles (I purchased 6 months ago)

Driving a couple days ago, I noticed the water temp was pinned, and upon checking the transmission temp, via digital dash, it registered 203F. I checked the coolant reservoir which was empty. I filled reservoir with an entire jug of coolant & a little under a half-gallon of water. This rectified the water temp, and the tranny temp seemed to drop down to an operating temp of 150F. This leads me to believe the tranny is connected to the radiator. Is this correct?

Now, two days later, I'm noticing the tranny is operating back up over 200F. I will be checking the coolant reservoir in the morning, even though the motor is cooling properly, but if the tranny is connected to the radiator & the tranny is overheating due to poor radiator performance & the radiator is low on coolant again, what do you think is the likely cause of radiator coolant loss as I see no leaks? Water pump [weep-hole]?

Normal operating temperature for the transmission is around 200°F.

Check my sig for the 2 most common coolant leaks. The Y connector generally happens at night when everything cools off and o rings shrink. So, if you look for a leak when you just stop driving, you don't find one, it leaks later.

MEATHEAD <> Thank you for that info. I speculated the 200F+ seemed hot; I guess not.

SPIKY <> Thank you for the link! When I get some time off of work I'll be looking into it. It [cooling system] seems to not be losing too much, respectively, since I topped it off those days ago, but it did take a quart & a pint last night. That's a lot, yes, but it's not losing so much that I've got caught overheating again.

Warm for the coolant is ~230° range. Hot I believe is 250°. Discovered when my truck popped off a coolant hose and dumped it on the Grapevine Pass on the I-5. :no:

These trucks will normally operate around 210 especially on warm days or inclines.