08-04-2012, 08:47 PM
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#1
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ATF Normal Operating Temp
Hey guys I am currently driving from California to Texas. I have been monitoring my ATF temps which have been anywhere for 174-212. I did a search to see what the normal operating range should be but come up with different answers. Can someone please tell me what the normal operating range should be? Thanks
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08-04-2012, 09:48 PM
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#2
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A little high, but nothing to get overtly concerned with while on the road. ATFs are effected by a myriad of different variables.
After the trip though, drain the ATF, and refill. If there is enough $$$ in the cookie jar, do a complete flush and procure a tranny cooler.
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08-04-2012, 09:57 PM
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#3
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Quote:
Originally Posted by LittleCaesar
A little high, but nothing to get overtly concerned with while on the road. ATFs are effected by a myriad of different variables.
After the trip though, drain the ATF, and refill. If there is enough $$$ in the cookie jar, do a complete flush and procure a tranny cooler.
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On one big hill I saw it go as high as 230! I have a tranny cooler but it doesn't seem like it. Hopefully this drive doesn't ruin the tranny
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08-04-2012, 09:59 PM
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#4
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I'm looking into a tranny cooler, is it worth it?
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08-04-2012, 10:14 PM
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#5
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Is the cooler mounted flush up against the AC condenser? How do you have it plumbed? Have you bypassed the radiator?
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08-04-2012, 10:18 PM
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#6
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Quote:
Originally Posted by Drcoffee
Is the cooler mounted flush up against the AC condenser? How do you have it plumbed? Have you bypassed the radiator?
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I'll have to check it came on the 4runner when I bought it. Yes the radiator has been bypassed
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08-04-2012, 10:30 PM
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#7
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Quote:
Originally Posted by PhdNPrerunners
I'll have to check it came on the 4runner when I bought it. Yes the radiator has been bypassed
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Reconnect the radiator and monitor the temps again. I'll bet the temps will stay below 190 all day long.
The radiator cooler is on the cool side of the radiator which means the coolant is well below the engine temperature. The extra trans cooler should bring you down 20 degrees'ish further from what you are experiencing now. Please do this before the next road trip. It's been a huge discussion here on several threads and it could be very illuminating.
Honestly, if you intend to bypass the radiator, use two coolers.
My best guess is you want the temps between 140*-170*
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2007 4Runner Sport 4WD 4.0L 228,000 miles
The real stats on gun murders in America compared to the world (link)
Good riddance to the Clinton Crime Family--> I Voted TRUMP…how’s it going for you now Trump is gone? Be careful what you ask for. You may just get it.
Last edited by Drcoffee; 08-04-2012 at 10:33 PM.
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08-04-2012, 10:41 PM
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#8
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Quote:
Originally Posted by Drcoffee
Reconnect the radiator and monitor the temps again. I'll bet the temps will stay below 190 all day long.
The radiator cooler is on the cool side of the radiator which means the coolant is well below the engine temperature. The extra trans cooler should bring you down 20 degrees'ish further from what you are experiencing now. Please do this before the next road trip. It's been a huge discussion here on several threads and it could be very illuminating.
Honestly, if you intend to bypass the radiator, use two coolers.
My best guess is you want the temps between 140*-170*
I've subscribed
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I thought the whole point of running a trans cooler is to bypass the radiator to avoid the pink milkshake
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08-04-2012, 10:53 PM
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#9
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Quote:
Originally Posted by PhdNPrerunners
I thought the whole point of running a trans cooler is to bypass the radiator to avoid the pink milkshake
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there's the "one percenters" out there who are terrified of the pink milkshake, yes. If you are running on a 10 year old radiator, you may want to be concerned. My contention has always been, keep the radiator connected but replace the old radiator as part of the normal maintenance for the vehicle. It's only $120.
The radiator modulates the transmission fluid temps in all conditions. In the case where you are exposed to higher ambient temps, the addition of an extra trans cooler will help prolong the life of the transmission.
Boy, I'd really like to see how the temps run with it reconnected.
How old is yours?
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2007 4Runner Sport 4WD 4.0L 228,000 miles
The real stats on gun murders in America compared to the world (link)
Good riddance to the Clinton Crime Family--> I Voted TRUMP…how’s it going for you now Trump is gone? Be careful what you ask for. You may just get it.
Last edited by Drcoffee; 08-04-2012 at 10:56 PM.
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08-04-2012, 11:01 PM
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#10
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Yes, if you are bypassing the radiator, use at least 2 coolers. I have mine with 12x5x0.75 inch cooler fitted after the radiator. I did freeway driving at 75 MPH for 1 hour and the temp was 120 F. This was on a hot summer day at about 95 F.
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08-04-2012, 11:47 PM
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#11
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Just more numbers to add, use them in your decision process as you wish.
Single cooler (B&M 70264), bypassed radiator. Today I pulled a 5x12 trailer with some furniture on it (300lbs), about 150 miles. Ambient air was 95.
Trans temp never went higher than 189. Most of the freeway and even in town was 155-175.
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08-05-2012, 01:38 AM
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#12
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Quote:
Originally Posted by PhdNPrerunners
I thought the whole point of running a trans cooler is to bypass the radiator to avoid the pink milkshake
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The pink milkshake prevention issue is divided into two camps.
Camp 1: replace the radiator with OEM quality unit every 100k and add an external cooler in-line with it if you want. Pros:- heat transfer between coolant and ATF gets tranny to optimal operating temps faster
- assuming an external cooler of the same size as camp 2, can get greater overall cooling
Cons:- more expensive
- there's still a small risk of pink milkshake (can you sleep at night?)
Camp 2: bypass the radiators integral tranny cooler and route the lines through an external cooler only. Pros:- cheaper
- There is no risk at all of pink milkshake (yep, you can sleep)
Cons:- Your tranny may not reach optimal operating temps in very cold weather or on short trips. If the cooler is good enough for towing up a mountain in the summer then imagine in the winter coasting downhill. (this should be somewhat mitigated by coolers that have in internal bypass like B&M)
I might have missed some aspect here... If I did someone chime in. I am in camp 2 and use a B&M 70264 mounted on the front of the AC condenser and approximately centered on the fan. If some day I have to replace my radiator anyway then I can see myself switching to camp 1.
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Other stuff: 1/2" body lift, B&M tranny cooler, extended rear diff breather, deckplate, blue-wire mod, ARB Tacoma BullBar, Smittybuilt XRC8 winch, 285/75/16's
Last edited by curtperry; 08-05-2012 at 01:49 AM.
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08-05-2012, 07:23 AM
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#13
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The tranny will run cooler with a properly sized tranny cooler bypassing the radiator. When I did all my AC work, I also replaced the radiator and hooked it back up in series with the tranny cooler just to see the difference in efficiency.
Alot of parameters come into play though. Cooler size, location, ambient air temp, city/highway driving. City driving I would see my tranny temp go up to maybe 190. With the radiator reconnected, and the same city driving its gone up to 210. My cooler is a Tru Cool. About the same dimensions of the B&M everyone suggests, but its 1.5" thick, not .75"
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08-05-2012, 11:09 AM
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#14
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Quote:
Originally Posted by opie74
The tranny will run cooler with a properly sized tranny cooler bypassing the radiator. When I did all my AC work, I also replaced the radiator and hooked it back up in series with the tranny cooler just to see the difference in efficiency.
Alot of parameters come into play though. Cooler size, location, ambient air temp, city/highway driving. City driving I would see my tranny temp go up to maybe 190. With the radiator reconnected, and the same city driving its gone up to 210. My cooler is a Tru Cool. About the same dimensions of the B&M everyone suggests, but its 1.5" thick, not .75"
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Is it plumbed outlet > radiator > Tru Cool > inlet ?
If so I'm surprised by the trans temp going up to 210 with city driving. Your coolant/radiator shouldn't get much higher than 210, and the Tru Cool in series after it should bring things down considerably.
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'99 Limited, Millennium Silver, E-Locker
Front: '99 Tall Springs, Tundra Bilstein 5100's @ 5th perch, 3/8 in. Top plate spacer, Light Racing/SPC UCA's, 1.25in wheel spacers, sway end links from 2nd gen rear
Rear: Toytec Superflex, 05'+ Tacoma Bilstein 5100's, extended bump stops, extended brake line, e-brake strain relief bracket, 1.25in wheel spacers, front sway bar links, ES sway bushings
Other stuff: 1/2" body lift, B&M tranny cooler, extended rear diff breather, deckplate, blue-wire mod, ARB Tacoma BullBar, Smittybuilt XRC8 winch, 285/75/16's
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08-05-2012, 12:05 PM
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#15
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Quote:
Originally Posted by curtperry
Is it plumbed outlet > radiator > Tru Cool > inlet ?
If so I'm surprised by the trans temp going up to 210 with city driving. Your coolant/radiator shouldn't get much higher than 210, and the Tru Cool in series after it should bring things down considerably.
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That was my concern as well. I could only think that the cooler is not flush against the AC condenser which means its not getting enough air through it to be effective.
__________________
2007 4Runner Sport 4WD 4.0L 228,000 miles
The real stats on gun murders in America compared to the world (link)
Good riddance to the Clinton Crime Family--> I Voted TRUMP…how’s it going for you now Trump is gone? Be careful what you ask for. You may just get it.
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