TOW VEHICLE TRANS. TEMP.

[fleetpaint]

I HAVE A 07 2X4 YUCON, THE TRANS. TEMP. RUNS AROUND 230 DEG. WHEN TOWING HILLS! I DO NOT HAVE THE EXTERNAL TRANS COOLER. THINK IM O.K.?

[chpthril]

Add one, they are cheap insurance as heat is the no. 1 cause of trans failure. Also have the trans fluid flushed every 30k or once a year depending on how offten you tow.

[fleetpaint]

THE LINES GO INTO THE RADIATOR. SHOULD I INSTAL THE NEW COOLER AFTER IT LEAVES THE RAD. OR BEFORE IT ENTERS?

[Domsz06]

I have a tran temp cooler and it reaches 215ish when cruising up hills in altitude when it's warm.

I would venture to say you should not even run it into the radiator. Just not use that and have your own separate cooler. That's how I'm set up now. but you could also run it after the radiater to get extra cooling.

[chpthril]

Install the cooler in front of the radiator. Take the trans fluid return line out of the radiator and go to the new aux cooler and then from there, back to the original return line.

The fluid flow will be as fallows: hot fluid from trans goes to rad, from rad to aux cooler, from aux cooler back to trans.

[fleetpaint]

SOUNDS GOOD! THANK YOU.

[Domsz06]

just a little info, but typically all caps means your yelling Obviously here your not, but just saying rock on and glad you got what you needed

[gman]

Fleetpaint,
Put on the external aux cooler. You need to get the heat out of that fluid. In previous years the aux trans cooler was standard on the Yukon with tow package. Also the oil was cooled through the radiator. Looks like GM is cheapening thier design.

[Domsz06]

Fleetpaint,
Put on the external aux cooler. You need to get the heat out of that fluid. In previous years the aux trans cooler was standard on the Yukon with tow package. Also the oil was cooled through the radiator. Looks like GM is cheapening thier design.

on 2x4's it was not stock it was an add on. 4x4s are stock, least the one's I have had and my mom's are that way.

[chpthril]

From Chevy's website


Std on all trim level Tahoe's Trailering equipment
includes seven-wire harness with independent fused trailering circuits mated to a seven-way sealed connector and trailer hitch platform with two-inch trailer receiver

Option on all trim level Tahoe's Trailering equipment, heavy-duty
includes transmission cooler and heavy-duty cooling (3.73 axle ratio only on 2WD; 3.73 and 4.10 axle ratio on 4x4)

From GMC's, no mention of aux cooler

Std on all trim level Yukon's Trailering equipment, heavy duty, includes trailer hitch platform, 7-wire harness with independent fused trailering circuits mated to a 7-way sealed connector, 2" trailering receiver, and electric brake controller jumper harness

EDIT: Aux cooler is listed as an option if you go through the "customize your Yukon"

[Domsz06]

There ya go.

[fleetpaint]

Domsz, sorry about the yelling caps! you learn something new everyday.

[Domsz06]

no worrys just wanted to let you know. I knew you were not doing it on purpose!! welcome to the forum, you will find a lot of people on here who know a LOT of things.

Enjoy and by all means when you have questions ask

[dogbert]

Domsz, sorry about the yelling caps! you learn something new everyday.

He needs a little yellin' every now and then

[anhaney]

Install the cooler in front of the radiator. Take the trans fluid return line out of the radiator and go to the new aux cooler and then from there, back to the original return line.

The fluid flow will be as fallows: hot fluid from trans goes to rad, from rad to aux cooler, from aux cooler back to trans.

This is the correct way to do it. It is not real hard to do. The cooler you can keep the trans the better. Mine runs around 190-200 depending on what I am doing. Also consider if you have a variable or positive displacement pump in the trans. If it is a positive one RPM does not matter if it is variable higher RPM will help to move more oil thus cooling the trans. Most of the transmissions today have thermostats built into them so you can add all the cooling equipment you want and it wont change because of the trans T-stat.