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#1
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ATF cooler thermostat
Hi All,
Winter in New England iis coming. In my daughters car, the small plate type ATF cooler mounted in front of condenser is presently plumbed in series after the primary cooler in the radiator. This proved to be a problem last winter, the transmission not heating up quickly or at all to lockup.
Comments please!
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Cheers! Gordon 1997 Ebony #308 113k "The Black Diva"SOLD 1992 Black over Liquid Silver 152k SOLD 1992 Ebony 251k 444 SOLD 1999 Silver SLK230 134k SOLD 1997 Green Outback 137k SOLD 2013 Honda Accord I4 SOLD 2015 Subaru Crosstrek 30k 2018 Tesla M3 30k |
#2
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A thermostat sounds like a bad idea as that would create a pump problem and fluid starvation problems I'd suspect, besides 180 degrees is too hot for tranny fluid anyways. Granted, too cold of fluid is just as bad as slightly too hot. I'm assuming you didn't put a gauge on it, if you did that would help quite a bit on determining how close you are. A parallel set up would allow for the radiator cooler to do its job and allow it to heat up the fluid as the engine warms. If it is a replacement radiator I'd do this. If it is an original 92-94 radiator I wouldn't as they have a screen in the cooler which can get clogged causing those pump/fluid starving problems. Best high tech advice I'd suggest would be a slice of cardboard in front of part or all of the cooler... It works on my Nighthawk oil cooler. Even have a slick cardboard set up that is painte black with strap ties to keep it in place.
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#3
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Unlike an engine t'stat the permacool thermostat has 2 in/2 outs, it is in bypass mode until the bimetallic spring opens the valve to allow fluid through the cooler. I don't think there would be any restriction from it.
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Cheers! Gordon 1997 Ebony #308 113k "The Black Diva"SOLD 1992 Black over Liquid Silver 152k SOLD 1992 Ebony 251k 444 SOLD 1999 Silver SLK230 134k SOLD 1997 Green Outback 137k SOLD 2013 Honda Accord I4 SOLD 2015 Subaru Crosstrek 30k 2018 Tesla M3 30k Last edited by processengr; 09-26-2007 at 07:16 AM. Reason: spelling |
#4
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Okay so now I see what it is. Have never looked at one so needed more explanation. I still wouldn't do it as 180 degrees is too hot to start cooling the tranny at (from one who has a gauge in his pan and knows just how hot things stay once they get warm). If you could get a t-stat that opened at 130-140ish that might be a different story
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#5
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In your cold winter circumstances I would re-plumb the additional cooler in parallel. I would also probably leave it that way all year round. It will do a good job anyway, summer or winter.
Joe
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Black Betty [Bam a Lam!] '93 UK spec, still languishing Betty Jersey Girl Silver '92 UK [Channel Isles] 40K Jersey Girl @ Mersea Candy Purple Honda Blackbird Plum Dangerous White X2 RVR Mitsubishi 1800GDI. Vantastic 40,000 miles Jersey Girl |
#6
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I have the same problem, but mine is plumbed before the radiator. I usually just put something in front of the cooler, otherwise it will go in and out of overdrive if it is cooler than about 50 outside. This causes a drastic decrease in fuel economy, and it is annoying. I was planning on doing it this weekend.
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2007 GS 450h-Active Stabilizer/Radar cruise 1994 L Blue 3.70 VTD ASE Master Automobile ASE Advanced Level Specialist Toyota Master Diagnostic Technician (former life) Last edited by NiftySVX; 09-26-2007 at 02:30 PM. |
#7
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180 too hot??
Most, if not all trans fluids are tested and designed to run at 175 degrees. Of course failures increase with temp ie 195 degrees and you will loose trans at 50,000 instead of 100,000 miles. Here is a site of interest http://au.geocities.com/ozbrick850/at-mortality.html I have the thermostat you mention, but it is from BM racing and is for transmissions. Hope to have it in soon--kinda getting cold here in northern PA.
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#8
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What temperature is it rated at?
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Dave - 03 Baja - 92 SVX - 86 Brat - 08 OB 3.0 |
#9
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FWIW Here is a link to the Perma-cool unit
http://www.perma-cool.com/Catalog/Cat_page14.html
__________________
Cheers! Gordon 1997 Ebony #308 113k "The Black Diva"SOLD 1992 Black over Liquid Silver 152k SOLD 1992 Ebony 251k 444 SOLD 1999 Silver SLK230 134k SOLD 1997 Green Outback 137k SOLD 2013 Honda Accord I4 SOLD 2015 Subaru Crosstrek 30k 2018 Tesla M3 30k |
#10
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BM racing unit is the same 180degree
BM racing unit is the same 180degree
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#11
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Subaru's recommended tranny temp 140-170. Once warm the SVX even while crusing on the highway tends to retain that heat in the tranny.
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#12
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I would be interested to know where the 140-170 figure came from. Usually, the manufacturers don't really specify, just that it should run "at about coolant temperature. This 140 to 170 number seems to be unrealistic considering the way the cooler works. But, engineers often provide unrealistic figures. I am going to get in on a thermostat.
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2007 GS 450h-Active Stabilizer/Radar cruise 1994 L Blue 3.70 VTD ASE Master Automobile ASE Advanced Level Specialist Toyota Master Diagnostic Technician (former life) |
#13
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Quote:
The owners manual. You know that thing in the glove box you must've not read. I can only tell you from my experience living with a cooler and a gauge in my pan that this does not sound like a reasonable solution for year round. Might work in the winter just fine but you'll be cooking your tranny on that first 70 degree day on your 25 minute commute to work. |
#14
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I have read the owners manual, I was just sayin that I don't really think that is a realistic figure. It could be though, maybe someone with a pan-mounted temp gauge could chime in.
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2007 GS 450h-Active Stabilizer/Radar cruise 1994 L Blue 3.70 VTD ASE Master Automobile ASE Advanced Level Specialist Toyota Master Diagnostic Technician (former life) |
#15
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It would be nice to have a thermostat set for 165F...OTOH, the thermostat only affects the auxilary cooler. If it opened at 180F, that would allow coolant to go through the aux. cooler, having already gone through the primary radiator cooler. The return oil temp. would be lower than the 180F setpoint as the thermostat measures ATF temp. before the aux. cooler. If it removed 10F then you would be close to the ideal temp...
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Cheers! Gordon 1997 Ebony #308 113k "The Black Diva"SOLD 1992 Black over Liquid Silver 152k SOLD 1992 Ebony 251k 444 SOLD 1999 Silver SLK230 134k SOLD 1997 Green Outback 137k SOLD 2013 Honda Accord I4 SOLD 2015 Subaru Crosstrek 30k 2018 Tesla M3 30k |
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