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tranny cooler question


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14 replies to this topic

#1 soobie_newbie67

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Posted 09 October 2012 - 08:45 PM

Can I bypass the cooler in the radiator all together or do I have to install it like a secondary like the instructions show??? Oh. I'm wanting to put an aftermarket trans cooler on my legacy.

#2 nipper

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Posted 09 October 2012 - 09:36 PM

I would go as a secondary, placing it between the tranny and the raditor. Keep in mind that the heat exchanger in the radiator serves two purposes. Not only does it help cool the transmission, but it also helps it warm up faster. If you put it after the radiator you may be keeping the tranny too cool.

#3 soobie_newbie67

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Posted 09 October 2012 - 10:29 PM

Ok. Thanks.

That's funny. I thought there was no such thing as too cool when it came to autos. My next question is: which of the 2 lines is the return? I'm assuming it's the lower one.

Edited by soobie_newbie67, 09 October 2012 - 10:32 PM.


#4 nipper

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Posted 09 October 2012 - 10:40 PM

I would hjave to look it up.

There is always such a thing as too cool. All liquids have an optimal operaiting temp. When they are cold, they are thick. This means everything has to work harder as they are resistant to being pumped. The tranny also will hold gears longer when cold to aid in the warmup of the transmission. If you live in a very cold climate I would suggest a Thermostat on the line. IN all honesty off hand I forget which is which I would have to look it up

#5 grossgary

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Posted 09 October 2012 - 10:59 PM

I install one separate, dedicated cooler rather than both. I don't like the extra failure points of having both - I want as few hoses and clamps as possible, it gets sloppy with all those extra hoses and clamps and is twice as likely to fail (though the risk is miniscule).

That being said, i totally understand and hear the issue with temps and too much cooling and heating. So far i've never had an issue so I'm not worried about it.

#6 nipper

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Posted 09 October 2012 - 11:08 PM

I install one separate, dedicated cooler rather than both. I don't like the extra failure points of having both - I want as few hoses and clamps as possible, it gets sloppy with all those extra hoses and clamps and is twice as likely to fail (though the risk is miniscule).

That being said, i totally understand and hear the issue with temps and too much cooling and heating. So far i've never had an issue so I'm not worried about it.


But you are in coal (coughcoughchristmasiscomingcough) country and fairly temperate. Running it through my head, without the t-stat still just 4 clamps and two hoses.

#7 markjw

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Posted 09 October 2012 - 11:51 PM

The top hose is the pressure line. The lower is the return. I'm also about to install a tranny cooler. I was going to completly bypass the radiator heat exchanger. After reading nippers post, I'm going to rethink that idea.

#8 Olnick

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Posted 10 October 2012 - 01:05 AM

Most manufacturers recommend mounting in the return line, after the tranny.

Attached Files



#9 nipper

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Posted 10 October 2012 - 09:20 AM

IN all my years of doing these on small displacemnt engines I have always put them before. I have also always installed them with temp gauges too. NOw if you live someplace hot it wont matter that much, but places with real winters it would.

Handy chart

http://www.txchange.com/heatchrt.htm

Sort of why subaru recomends 36000 mile fluid changes. With a cooler

My temp sensor is in the hotest spot, the feed to the cooler. My driving (NYC stop and go) I have seen it as high as 100 over ambient, but that is peak summer).
Anything over 275 is bad, 200 is on the lower end of high, and 175 is just right on average). If you live in a hot climate all year round then I would go after.

Edited by nipper, 10 October 2012 - 09:28 AM.


#10 grossgary

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Posted 10 October 2012 - 09:31 AM

Running it through my head, without the t-stat still just 4 clamps and two hoses.

normally: one hose to and from the cooler = 2 hoses and 4 clamps.

with Both in place it's now:
1 hose from trans to rad
1 hose from rad to cooler
1 hose from cooler to trans

so we are both a bit off - it's now 3 hoses and 6 clamps instead of 2 hoses and 4 clamps. 50% increase in risk and failure modes.

#11 nipper

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Posted 10 October 2012 - 09:33 AM

so we are both a bit off - it's now 3 hoses and 6 clamps instead of 2 hoses and 4 clamps. 50% increase in risk and failure modes.



Always the difficult child ...

:popcorn:

#12 soobie_newbie67

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Posted 10 October 2012 - 07:01 PM

Ok. I got the cooler installed and I'm good to go. Installed it like the picture shows. And replaced both of the rubber hoses, I think they were the originals.

#13 bulwnkl

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Posted 11 October 2012 - 09:12 PM

Always the difficult child ...

:popcorn:

Well getta loada dis:

My Baja has a rubber line off the tranny, then a hard line forward, then another rubber line to the factory in-port. Same collection going back to the tranny. So that's 4 hoses and 8 clamps from FHI. Adding an aux cooler only adds 1 hose w/2 clamps. So, the additional failure points aren't even as high as problem-child claims on the Baja. :-p :D

Anyway, OP's climate is very mild. Frankly, it would surprise me quite a bit if either cooling OR heating is needed very much where he is (I spent round-about 30 years just a little ways north of there).

#14 soobie_newbie67

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Posted 11 October 2012 - 11:18 PM

Well getta loada dis:

My Baja has a rubber line off the tranny, then a hard line forward, then another rubber line to the factory in-port. Same collection going back to the tranny. So that's 4 hoses and 8 clamps from FHI. Adding an aux cooler only adds 1 hose w/2 clamps. So, the additional failure points aren't even as high as problem-child claims on the Baja. :-p :D

Anyway, OP's climate is very mild. Frankly, it would surprise me quite a bit if either cooling OR heating is needed very much where he is (I spent round-about 30 years just a little ways north of there).


Actually the dri-************tiez has a very off the wall climate. It changes unexpectedly.

#15 porcupine73

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Posted 13 October 2012 - 06:59 PM

Well I have yet to see one of the original hoses fail, but, those damn $%*(# hard lines that go under the battery - those are almost guaranteed to rust out, at least in the rust belt. But then in the rust belt what isn't I guess ...




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