Lotus1

Driving on a warm day last week and my temp went close to 210 degrees (see pic below).

My truck is an Auto 22RE. I've only owned this truck for about 3 years and have not done any fluid change yet.

So is that temp too high? I wasn't towing anything, just driving normal down the highway.

I'm going to do some research on transmission coolers now. Any suggestions? I know that room is tight and will probably need to install the cooler somewhere underneath?

I appreciate any advice, thanks!

ZUK

iTrader: (1)

210 seems high for casual highway. I assume the temperature sender is mounted in the Tranny pan? If the sender is in the tranny output metal line then maybe 210 is not that unusual.
I have the Hayden 678 in my 2001 Taco. 11" x 9" x .75" about and it does the cooling I need for the slow trails on the 105 degree days. If you can fit the model 679 (11" x 11") then go for it. If you do not mount the cooler right up against the radiator with the 4 supplied pull-wraps then you are loosing alot of cooling efficiency. ZUK

edit--- I see the other temp gauge underneath shows close to 210 also...is that the water temp? If so, that also seems high as the factory thermostat is closer to 180.

Lotus1

Hey Zuk, thanks for the reply.

Yeah the temp sensor is located in the pan.

I also did a search and found the thread you mentioned about the Hayden. So I will take a look at that one. The problem might be the limited room I have available.

I'm also thinking of doing a fluid change with possibly Synthetic. Still doing some reading.

Yeah, the bottom gauge is the coolant temp. It normally does run consistently at 180 or below. It was pretty hot that day. i may just change the thermostat just to be on the safe side. They're easy enough to change espeically on the 22re.

ZUK

iTrader: (1)

I bet if you put your mind to it that you can re-locate/space-out/tweak those things that are directly in front of the radiator. The horn easily moves away...the vertical brace can be spaced away from the radiator. etc

Toyota water temps should be rock stable to temperature variations...whether it's 75 degrees or 110 degrees outside. If you are seeing higher water temps just because of a 20 degree change in outdoor temps then you have a cooling system that is on the verge of causing a future over-heating issue with a resultant head gasket expense. Often, it's a radiator that is partially clogged causing this. A new radiator could fix your water temp issue....and the tranny temp could also come done. I don't put much faith in a thermostat for your situation as you have described it. Fan clutch does not apply at highway speeds....yours has the "footprint" of a radiator with a lot of calcium deposits. New ones online can be had a a great deal.

Thinking about your situation....it is perfectly normal for the tranny temp to be 210 when the water is at 210 also. Get the water temp down to 180 and the tranny will be closer to 180.

I still think the external tranny cooler is a smart investment even if the temps do come down with the new radiator. With a properly mounted ext cooler(TOUCHING the radiator fins), expect tranny pan temps of 140.