Query on Auto Transmission Temperatures

[watsea Member Find all posts View Profile Close watsea]

I will doing some towing and I have set up Torque Pro app on an unused android phone.

I have pan and torque converter temperature equations similar to those that have been posted a few times in this Forum.
Everything appears sensible. ie Engine temperature and both pan and torque converter temperatures are all the same, if a cold start.

While not towing on highway driving, engine is at 86C, pan is 91C, converter 91-92C. Ok I think.
While waiting a red light after this weekend's highway travel, still in Drive, pan temperature shows as about 102C and converter temperature at about 104-105C.
Would those be correct?

[Guest Close Guest]

Sounds about right if a load. When was trans fluids last changed? Should do every 40-50k kms. Fitting a torque converter lockup will help keep temps down. Stocklock do a good unit.

[watsea Member Find all posts View Profile Close watsea]

Hi Piggy,
It's a new car. Bought late July 2019 . Only just under 8,000km on the clock. Booked for first regular service next week.

[Wiggy Junior Member Find all posts View Profile Close Wiggy]

My June 2019 GXL is pretty much the same and it's the unlocked TC that heats things up quickly.
Looking into one of the new tri speed Stocklock units !

[Guest Close Guest]

If its a hot day the trans will sit higher temps. Mine reguarly gets in the low 100's on a 35 plus day. on my Prado and 200 series.

[404pug Avid PP Poster! Find all posts View Profile Close 404pug]

Ditto my 2016.

[watsea Member Find all posts View Profile Close watsea]

Thanks all. Yep, reasonably hot day last Sunday when I was travelling. 33-34C outside temperature was on the dashboard.

Some mods have been thought about but not until a little further through the warranty period. Dealer Service Manager gave a warning about fitting stuff and impact on warranty claims prior to the fitting of a catch can. I went ahead anyway with that one. I made inquiries about a engine remap or a chip but even one provider gave a warning. His Ford Ranger had a major engine problem luckily covered by warranty before he did a remap.

[RPP Senior Member Find all posts View Profile Close RPP]

When I'm driving around undulating countryside @ 100-110Km/hr its common for the Torque Converter fluid to sit 110-120C.
In S4 it will drop to around 100 plus or minus a few C, but revs go up.

Every transmission specialist I've talked to says fit an ATF heat exchanger.
Every Toyota dealer workshop mgr I've talked to says don't bother its fine, maybe have the fluid changed every 80-100K km.

[watsea Member Find all posts View Profile Close watsea]

RPP,

Thanks

I had a good run with an auto transmission shop with my old series 90. Regularly at 40k service intervals. No problems with the Trasnmission even with some significant towing for that cars capacity. Traded it in at close to 390k kms.
My transmission mechanic said auto coolers are good, but he said so were more regular services. Prado service handbook says 100k km for towing and hard service life.