At what trans temp should I start to worry?
06-27-21, 06:14 PM
#1
Driver School Candidate
Thread Starter
At what trans temp should I start to worry?
Was doing a little spirited driving maybe hitting 110 for a few seconds then coming back down only did a few pulls then back to regular 70 mph but I noticed my AT trans temp hit 200 then went back down to 197 then locked back at 200F not sure if this is normal or if something isn't right.
06-28-21, 01:17 PM
#4
I think normal auto transmission fluid for Toyota and Lexus vehicles with the Toyota WS fluid is probably around 200 to 220s.
The ATF temperature depends on ambient temperature, driving style, climbing a hill, descending a hill, cargo weight, distance traveled, stop and go traffic, and highway cruising.
Scangauge is connected to the vehicles all the time and real time ATF temp is seen (after vehicle is fully warmed):
2005 Lexus LS430: Around 190 to 204 but highway has seen 220 followed by 240 with city driving (Engine coolant was 190 at that time)
2018 Toyota Sienna: Around 190 to 203; however peak was recorded at 213.
2019 Lexus GS350: Around 212 during long highway drive with peak at 230 (engine coolant 193).
2020 Toyota Tundra: Peak recorded at 235 with engine coolant 195 (not towing anything at this time).
2020 Ford Explorer ST: Peak ATF at 206 (not towing).
If you research normal auto transmission fluid temp, you will find that it is 180. Some ATF Repair websites will say that for every 20 degrees F above 180, you will halve the transmission life.
From my sampling with scan gauge 2 monitoring the ATF temp, I have concluded that running in the 200 to 220 is probably normal. I don't think a lot of Toyota or Lexus vehicles even have a line (hose) that Even run to the radiator to cool it. There may be an oil line that runs near the transmission to warm it up more quickly though.
Maybe ignorance is bliss (not knowing the ATF temp) but having scan gauge is useful when one wants to drain and fill the ATF in the future (especially after knowing how hot your ATF really is).
The ATF temperature depends on ambient temperature, driving style, climbing a hill, descending a hill, cargo weight, distance traveled, stop and go traffic, and highway cruising.
Scangauge is connected to the vehicles all the time and real time ATF temp is seen (after vehicle is fully warmed):
2005 Lexus LS430: Around 190 to 204 but highway has seen 220 followed by 240 with city driving (Engine coolant was 190 at that time)
2018 Toyota Sienna: Around 190 to 203; however peak was recorded at 213.
2019 Lexus GS350: Around 212 during long highway drive with peak at 230 (engine coolant 193).
2020 Toyota Tundra: Peak recorded at 235 with engine coolant 195 (not towing anything at this time).
2020 Ford Explorer ST: Peak ATF at 206 (not towing).
If you research normal auto transmission fluid temp, you will find that it is 180. Some ATF Repair websites will say that for every 20 degrees F above 180, you will halve the transmission life.
From my sampling with scan gauge 2 monitoring the ATF temp, I have concluded that running in the 200 to 220 is probably normal. I don't think a lot of Toyota or Lexus vehicles even have a line (hose) that Even run to the radiator to cool it. There may be an oil line that runs near the transmission to warm it up more quickly though.
Maybe ignorance is bliss (not knowing the ATF temp) but having scan gauge is useful when one wants to drain and fill the ATF in the future (especially after knowing how hot your ATF really is).
The following 2 users liked this post by kkchoi:
2GR (06-28-21),
MissMy93Sc (06-28-21)
06-28-21, 07:12 PM
#5
Intermediate
I think normal auto transmission fluid for Toyota and Lexus vehicles with the Toyota WS fluid is probably around 200 to 220s.
The ATF temperature depends on ambient temperature, driving style, climbing a hill, descending a hill, cargo weight, distance traveled, stop and go traffic, and highway cruising.
Scangauge is connected to the vehicles all the time and real time ATF temp is seen (after vehicle is fully warmed):
2005 Lexus LS430: Around 190 to 204 but highway has seen 220 followed by 240 with city driving (Engine coolant was 190 at that time)
2018 Toyota Sienna: Around 190 to 203; however peak was recorded at 213.
2019 Lexus GS350: Around 212 during long highway drive with peak at 230 (engine coolant 193).
2020 Toyota Tundra: Peak recorded at 235 with engine coolant 195 (not towing anything at this time).
2020 Ford Explorer ST: Peak ATF at 206 (not towing).
If you research normal auto transmission fluid temp, you will find that it is 180. Some ATF Repair websites will say that for every 20 degrees F above 180, you will halve the transmission life.
From my sampling with scan gauge 2 monitoring the ATF temp, I have concluded that running in the 200 to 220 is probably normal. I don't think a lot of Toyota or Lexus vehicles even have a line (hose) that Even run to the radiator to cool it. There may be an oil line that runs near the transmission to warm it up more quickly though.
Maybe ignorance is bliss (not knowing the ATF temp) but having scan gauge is useful when one wants to drain and fill the ATF in the future (especially after knowing how hot your ATF really is).
The ATF temperature depends on ambient temperature, driving style, climbing a hill, descending a hill, cargo weight, distance traveled, stop and go traffic, and highway cruising.
Scangauge is connected to the vehicles all the time and real time ATF temp is seen (after vehicle is fully warmed):
2005 Lexus LS430: Around 190 to 204 but highway has seen 220 followed by 240 with city driving (Engine coolant was 190 at that time)
2018 Toyota Sienna: Around 190 to 203; however peak was recorded at 213.
2019 Lexus GS350: Around 212 during long highway drive with peak at 230 (engine coolant 193).
2020 Toyota Tundra: Peak recorded at 235 with engine coolant 195 (not towing anything at this time).
2020 Ford Explorer ST: Peak ATF at 206 (not towing).
If you research normal auto transmission fluid temp, you will find that it is 180. Some ATF Repair websites will say that for every 20 degrees F above 180, you will halve the transmission life.
From my sampling with scan gauge 2 monitoring the ATF temp, I have concluded that running in the 200 to 220 is probably normal. I don't think a lot of Toyota or Lexus vehicles even have a line (hose) that Even run to the radiator to cool it. There may be an oil line that runs near the transmission to warm it up more quickly though.
Maybe ignorance is bliss (not knowing the ATF temp) but having scan gauge is useful when one wants to drain and fill the ATF in the future (especially after knowing how hot your ATF really is).
The following 2 users liked this post by thallium:
2GR (06-28-21),
MissMy93Sc (06-28-21)
06-28-21, 10:59 PM
#6
I frequently see ATF Temps between 200-204 on warm days w/ hilly freeways (Long Steady Climbs).
Highest I've seen was 214 on a hot day doing 80 on the same route. Takes a long time for ATF temps to settle down.
P.S. I use a Scanguage
Highest I've seen was 214 on a hot day doing 80 on the same route. Takes a long time for ATF temps to settle down.
P.S. I use a Scanguage
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