Hyundai Tucson 4 New - Automatic transmission overheating!
Hello, fellow motorists!
In this video, I want to share some information about the operating temperature of the engine and automatic transmission in winter!
This video will focus on 2.0-liter Smartstream gasoline engines and hydraulic automatic transmissions (type A6MF2). Hybrids, automatic transmissions, and diesel engines are not discussed yet.
I'd like to inform everyone right away that the temperature gauge on the dashboard in new cars doesn't constantly display engine temperature changes and is always in the operating range of up to +90 degrees Celsius.
Unfortunately, this is the current setting for many cars, and some models simply don't have a temperature gauge. Instead, there's a blue indicator for a cold engine and a red indicator for engine overheating.
In our case, the video shows two new cars (2021, assembled in the Czech Republic). On the highway and in a parking lot, the engines consistently display an operating temperature of +98 to +108 degrees Celsius, and this is without a load and with an outside air temperature close to 0 degrees Celsius. The automatic transmission temperature in these cars, parked in a parking lot, approaches 106 degrees Celsius after 40 minutes, and in first gear in a traffic jam, it reaches 115 degrees Celsius after 40-50 minutes.
We don't yet know how this "overheated" transmission will perform in hot weather or under high loads, but we do know that the service life of the automatic transmission in these cars will be significantly lower than in identical automatic transmissions from previous years with cooler (set) radiator heat exchangers.
Currently, we recommend the following solution:
1. Install an additional external KIA-Hyundai automatic transmission radiator (after 1 year or 20,000 km), when the official warranty on the automatic transmission clutches expires.
2. Perform a regular automatic transmission oil change (without installing a radiator) every other service.
3. Operating the vehicle on the highway or in cities where there are no hours-long daily traffic jams or endless congestion.
Also, remember that the normal operating temperature for a hydraulic automatic transmission (without load) should not exceed 96 degrees Celsius. Higher temperatures lead to burning of the clutch packs, damage to the seals, and problems with the valves and valve bodies.
There is a huge amount of information on automatic transmission lifespan and operating temperatures online; with your permission, I will not comment on years of research in this area.
Our authorized dealers are already aware of this issue, and I hope we will receive official information on this matter soon.
If you have adapters for OBD ports, you can check all these readings yourself in your cars.
By the way, they also overheated the new 2.0 turbo diesel, with an operating temperature of 107 degrees Celsius, which is generally unrealistic for a diesel engine!
The full discussion of this topic is here: https://www.drive2.ru/l/6049587203796...
That's all for now, to be continued!