Transmission temperature - Taurus Car Club of America : Ford Taurus Forum
Register Home Forums Active Topics Topic Finder Photos Members List Search Today's Posts Mark Forums Read Auto EscrowAuto Loans
TaurusClub.com is the premier Ford Taurus Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools
Old 11-09-2012, 10:47 AM   #1 (permalink)
Devoted Member
 
SoNic67's Avatar
 
Member Number: 35029
Join Date: Mar 2011
Chapter: Northeast
Drives: 1996 Sable LS, 3.0L V6 24V Duratec, AX4N
Visit: My Garage
Posts: 1,817
Trader Score: 0 reviews
Rep Power: 12
SoNic67 has a spectacular aura about
Default Transmission temperature

Now, that the colder mornings are in, I did a reading on my transmission temperature.
Outside temperature - 38-40F.
Transmission temperature slowly climbed to reach 120F after a 25 minute drive - half on highway. Stock cooler, OBDII reading.
Is it true that the TC will not lock-up if temperature is below 150F??

I am looking to find a way to keep it from cooling while is not at that temperature - maybe a 3-way thermostatic valve...

Last edited by SoNic67; 11-09-2012 at 11:08 AM.
SoNic67 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 11-09-2012, 10:58 AM   #2 (permalink)
Sam
breeves002
 
Sam's Avatar
 
Member Number: 49890
Join Date: Sep 2012
Location: St. Louis, MO
Chapter: Midwest
Drives: 2008 Mercury Sable Premier
Visit: My Garage
Posts: 6,093
Trader Score: 8 reviews
Rep Power: 68
Sam has a reputation beyond reputeSam has a reputation beyond reputeSam has a reputation beyond reputeSam has a reputation beyond reputeSam has a reputation beyond reputeSam has a reputation beyond repute
Default

I guess you have an external cooler installed? I don't know the exact temp, but it is true TC won't lockup if it is not warm enough. Install a cooler that is made not to over cool (has that valve built in). That valve would work, it would bypass the cooler unless the temp is high enough.

Where are you taking your temp reading from? Did you verify TC didn't lockup?
__________________
Sam

2008 Mercury Sable Premier
2012 Kia Soul Base AT 1.6GDI
2004 Acura TSX 2.4
Moved On: 2000 Sable LS Premium Duratec
Sam is offline   Reply With Quote
Old 11-09-2012, 11:04 AM   #3 (permalink)
Devoted Member
 
SoNic67's Avatar
 
Member Number: 35029
Join Date: Mar 2011
Chapter: Northeast
Drives: 1996 Sable LS, 3.0L V6 24V Duratec, AX4N
Visit: My Garage
Posts: 1,817
Trader Score: 0 reviews
Rep Power: 12
SoNic67 has a spectacular aura about
Default

I have the stock cooler on '96 Sable. Reading is via OBDII.
SoNic67 is offline   Reply With Quote
Old 11-09-2012, 12:30 PM   #4 (permalink)
Sam
breeves002
 
Sam's Avatar
 
Member Number: 49890
Join Date: Sep 2012
Location: St. Louis, MO
Chapter: Midwest
Drives: 2008 Mercury Sable Premier
Visit: My Garage
Posts: 6,093
Trader Score: 8 reviews
Rep Power: 68
Sam has a reputation beyond reputeSam has a reputation beyond reputeSam has a reputation beyond reputeSam has a reputation beyond reputeSam has a reputation beyond reputeSam has a reputation beyond repute
Default

I guess I don't understand how the third gen coolers work. Is it the same as gen 4 or are they bigger? I know mine is just a pipe. I also didn't know that you could get the temp reading through OBD-II, can gen 4 do that as well? Hah! My scan tool supports a LOT of PID's, but I've never seen a trans temp reading.

If it is stock cooler and is the same as mine, it is possible your actual temp reading is lower than it really is. Did you confirm TC isn't locking at that temp? Someone will have to chime in and tell us what the temp for the TC to lockup is.
__________________
Sam

2008 Mercury Sable Premier
2012 Kia Soul Base AT 1.6GDI
2004 Acura TSX 2.4
Moved On: 2000 Sable LS Premium Duratec
Sam is offline   Reply With Quote
Old 11-09-2012, 06:58 PM   #5 (permalink)
Technical Advisor
 
behlinla's Avatar
 
Member Number: 14275
Join Date: Dec 2007
Location: Wisconsin
Chapter: Midwest
Drives: A blue car
Visit: My Garage
Posts: 7,503
Trader Score: 0 reviews
Rep Power: 80
behlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond repute
Default

Did you rig your fans to be on all the time? Are all the air dams in place? The coolant temperature is also used to determine whether the torque convertor will lockup.
behlinla is offline   Reply With Quote
Old 11-09-2012, 09:11 PM   #6 (permalink)
Technical Advisor
 
Member Number: 11378
Join Date: Feb 2007
Location: Milwaukee, WI
Visit: My Garage
Posts: 4,919
Trader Score: 0 reviews
Rep Power: 62
Jeff K has a reputation beyond reputeJeff K has a reputation beyond reputeJeff K has a reputation beyond reputeJeff K has a reputation beyond repute
Default

It is NOT TRUE that converter will not lock up until TFT hits 150. Think about it.... during the summer after a cold start, TC locks nearly immediately.

There is a lookup table in the PCM of IAT (which the PCM takes as the ambient temp) vs minimum TFT for lockup. I forget the exact temps, but the lower IAT is, the higher the min TFT for lockup. ECT may be in there somewhere also.... I forget.... been a long time since I have seen the tables.

This is kind of like the long standing internet myth that the PCM wont go closed loop until the engine hits 180 to 190 deg.
__________________
05 Taurus SEL Duratec - my daily driver
04 Taurus SES Duratec - wifes car
95 Taurus GL Vulcan winter car
Toy #1 - 86 Tbird 5.0 (original owner) - LOTS of mods
Toy #2 - 88 Tbird Turbo Coupe - LOTS of mods
02 Pontiac Grand Prix GT
67 Honda 450 Super Sport - completely customized
Jeff K is offline   Reply With Quote
Old 11-10-2012, 06:17 AM   #7 (permalink)
Devoted Member
 
SoNic67's Avatar
 
Member Number: 35029
Join Date: Mar 2011
Chapter: Northeast
Drives: 1996 Sable LS, 3.0L V6 24V Duratec, AX4N
Visit: My Garage
Posts: 1,817
Trader Score: 0 reviews
Rep Power: 12
SoNic67 has a spectacular aura about
Default

Well, I would be happy to see those tables. On highway, TC locked (I think) when temp was over 120F. It might lock earlier, but before that I was in a traffic that wasn't prone to TC lockup
The issue that I see is that transmission temperature climbs VERY slowly compared with engine temperature. Fans are not on, the low speed fan comes on at 210F (coolant temperature). I don't think there is a thermostatic valve for the transmission oil. In cold mornings, the transmission oil gets over-cooled.

PS: With my OBDII reader I found out that Ford has temperature sensors in their transmissions but GM doesn't (unless is Allison heavy duty). That reader is the best toy that I got for only $12!

Last edited by SoNic67; 11-10-2012 at 06:20 AM.
SoNic67 is offline   Reply With Quote
Old 11-10-2012, 11:34 AM   #8 (permalink)
Sam
breeves002
 
Sam's Avatar
 
Member Number: 49890
Join Date: Sep 2012
Location: St. Louis, MO
Chapter: Midwest
Drives: 2008 Mercury Sable Premier
Visit: My Garage
Posts: 6,093
Trader Score: 8 reviews
Rep Power: 68
Sam has a reputation beyond reputeSam has a reputation beyond reputeSam has a reputation beyond reputeSam has a reputation beyond reputeSam has a reputation beyond reputeSam has a reputation beyond repute
Default

What reader do you use and how did you get it for $12? I found out my scan tool supports almost everything under the sun, except transmission temperatures. Of course.
__________________
Sam

2008 Mercury Sable Premier
2012 Kia Soul Base AT 1.6GDI
2004 Acura TSX 2.4
Moved On: 2000 Sable LS Premium Duratec
Sam is offline   Reply With Quote
Old 11-10-2012, 06:59 PM   #9 (permalink)
Technical Advisor
 
behlinla's Avatar
 
Member Number: 14275
Join Date: Dec 2007
Location: Wisconsin
Chapter: Midwest
Drives: A blue car
Visit: My Garage
Posts: 7,503
Trader Score: 0 reviews
Rep Power: 80
behlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond reputebehlinla has a reputation beyond repute
Default

Yes, could you tell us what model scan tool you are using and which software? Transmission fluid temp is not part of the normal OBD-II parameters, so are you sure you're reading ATF temp and not something else? The only way I see of reading it outside of proprietary software is perhaps by reading mode $22 data.

Also, are you sure the temperature units are in Fahrenheit and not Celsius? 120C would be a more reasonable fluid temp (248F).
behlinla is offline   Reply With Quote
Old 11-10-2012, 07:05 PM   #10 (permalink)
Cake monster

 
Member Number: 18214
Join Date: Mar 2009
Chapter: Northeast
Drives: none right now
Visit: My Garage
Posts: 1,581
Trader Score: 0 reviews
Rep Power: 18
JW657 is a jewel in the rough
Default

Quote:
Originally Posted by behlinla View Post
Yes, could you tell us what model scan tool you are using and which software? Transmission fluid temp is not part of the normal OBD-II parameters, so are you sure you're reading ATF temp and not something else? The only way I see of reading it outside of proprietary software is perhaps by reading mode $22 data.

Also, are you sure the temperature units are in Fahrenheit and not Celsius? 120C would be a more reasonable fluid temp (248F).
I'm still trying to wrap my head around how it could be 120F after 25 minutes of driving. It doesn't seem quite right to me.
__________________
I love cake. I AM THE CAKE BOSS!

JW657 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 09:02 PM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.3.2