Trans cooler bursts!

[HUM GOOD]

Originally Posted by pdsq99f4

I would have them replace the water pump gaskets while they are in there. Have seen them fail shortly after due to the atf eating them away.

Thanks for the info.....I spoke with them. They said they would not do it unless I paid for it.....So I had them note my concern on the invoice, the GM said if it breaks through it will be noted and covered.


I picked up the truck today. Total invoice was $8300. Hummer picked up $5200. The balance was $3100. The dealer discounted me down to $2100.

[HUM GOOD]

Originally Posted by PhilD

That is amazingly good for a vehicle out of warranty, GM/Hummer did well!

Yes, i am not one for letters.....but I will be writing one to hummer and one to the dealer for their excellent service. They even returned ALL my calls with in one hour......AMAZING!

[HUM GOOD]

I finally got time to post -

I looped the tranny section of the radiator with a hose, closing it and elimanating the possible of the pepto bismal effect ever happening again.

With the information provided by Phil D (Thanks you the man) I purchased the larger of the 2 cooler Tru cooler #4739-1. I easily mounted it slightly off center towards the passenger side of the rig leaving the power steeering cooler in it's place.

The tranny now runs consistently at 150 degrees and the chance of the trans fluid mixing with the antifreeze is eliminated.

Thanks guys for all the awesome info.


brand new silver tru cooler 4739-1




Black hose is link to close off radiator section
Orange hose is feed to the new cooler

[HUMMERcustoms.com/TAZ]

I have been giving this some thought and like your idea. It appears though I may have to think of something different as it appears there is no room in front for supercharger cooler. It is hard to tell but, I think I would not be able to do this unless i moved SC cooler and added a fan to it so it does not have to have forced air from dual electric fans.

HUM GOOD have You seen the Magnuson SC cooler? Can You tell what would need to be done with this MOD to work with SC?
Thanks

As usual Phil is the man with the plan. Thanks Phil!!

TAZ

[HUM GOOD]

Originally Posted by HUMMERcustoms.com/TAZ

I have been giving this some thought and like your idea. It appears though I may have to think of something different as it appears there is no room in front for supercharger cooler. It is hard to tell but, I think I would not be able to do this unless i moved SC cooler and added a fan to it so it does not have to have forced air from dual electric fans.

HUM GOOD have You seen the Magnuson SC cooler? Can You tell what would need to be done with this MOD to work with SC?
Thanks

As usual Phil is the man with the plan. Thanks Phil!!

TAZ

shoot me a pic of it with measurements.....I'll measure it up with the tru cool and see if they can be mounted together.

[It\'s a Dry Heat]

Open up the fake top hood vent on the H2 like the H1. Place your coolers there.

Custom hood grill - http://www.amazon.com/dp/B000KOSRHE?tag=ebuyitonline&camp=14573&creative=32 7641&linkCode=as1&creativeASIN=B000KOSRHE&adid=003 5N7BDX4R46K012N40&

[HUMMERcustoms.com/TAZ]

I run a functional cowl hood scoop over the hole we cut where fake vents use to be.

It would have quite a bit of header heat as well as radiator etc. heat going out the scoop. There are many places to add different sizes of coolers even if you need to add a fan if you do not get normal air flow.

TAZ

[IRA51]

from the picture it looks you also remove the small trans cooler and brackets to mount the 4739-1 . and use some the mounting holes of the old trans cooler to mount the 4739 .and than you need to plug all 4 lines to the rad.

[HUM GOOD]

Originally Posted by IRA51

from the picture it looks you also remove the small trans cooler and brackets to mount the 4739-1 . and use some the mounting holes of the old trans cooler to mount the 4739 .and than you need to plug all 4 lines to the rad.

Yes replace the smaller cooler with the 4739. I used one hole(top drivers side) from the old cooler. Drilled one new top pass. side. The bottom 2 used brackets that come with the 4739.
As for the radiator. I just by-passed completely. There are 2 lines (one in and one out) they are looped by just clipping the exsisting tubing and looping a short pc of the tubing which comes with the 4739. The 2 lines which came from the rad go to either end of the new cooler(cooler is not directional) this completes the 4739 loop and we are good to go. Very simple.
I found that keeping the connectors in place and clipping the tubing, the supplied rubber hose slid over the exsisting tubing as a perfect fit..

[IRA51]

what about the 2 lines on the drivers side of the rad ? my rad has 4 lines 2 on each side that go into the plastic tanks on ether side of the rad .

[nmu98]

I looked all of this over today and I would not just loop the oil cooler lines on the drivers side. There is so much room over there that you might jut as well add a small cooler, or clean out your factory tranny cooler and mount it over there.

On another note- how many of these trans coolers are bursting, and are they bursting on the 03-04? or newwer? We added a second tranny cooler and a fan on a 1500hd this weekend... the second cooler was unnecisary, but the small 8" fan rocks..... Set up on a thermostat....

[IRA51]

going to leave the oil cooler as is for the time being.

[HUM GOOD]

Originally Posted by nmu98

I looked all of this over today and I would not just loop the oil cooler lines on the drivers side. There is so much room over there that you might jut as well add a small cooler, or clean out your factory tranny cooler and mount it over there.

On another note- how many of these trans coolers are bursting, and are they bursting on the 03-04? or newwer? We added a second tranny cooler and a fan on a 1500hd this weekend... the second cooler was unnecisary, but the small 8" fan rocks..... Set up on a thermostat....

The issue is not in the trans cooler itself. It is in the side resi of the rad where the lines pass through. These are located on the passengeer side of the rig. The larger tubes are located on the drivers side, which go to the engine block....thinking some kind of oil cooler. I didn't touch them.....trying to investigate if anyone had any issues with this bursting, causing oil to mix with antifreeze......that would suck! If no issues I plan on leaving it alone.

[nmu98]

how many of these trans coolers are bursting, and are they bursting on the 03-04? or newwer?

Thats what I want to know!

[Tallowood_Air]

Originally Posted by nmu98

Thats what I want to know!

mine just did.

~14k miles

GM would not participate in any repairs, under any circumstances.

talked my way up to John Martin (regional guy for alabama and mississippi)
678.787.7200

~$2000 for a new radiator, external tranny cooler, and some other work.

pulling out the stops for a 4L80E - I'd rather blow a diff than another trans.

[nmu98]

Originally Posted by Tallowood_Air

mine just did.

~14k miles

GM would not participate in any repairs, under any circumstances.

talked my way up to John Martin (regional guy for alabama and mississippi)
678.787.7200

~$2000 for a new radiator, external tranny cooler, and some other work.

pulling out the stops for a 4L80E - I'd rather blow a diff than another trans.

But you are supercharged with a modified tranny...... How many burst stock...

[MONSTERMATT]

Just ordered the tru-cool, as my factory warranty is just expiring- looking forward to this install , ill let u know how it goes, thanks for the info

[HUM GOOD]

Originally Posted by MONSTERMATT

Just ordered the tru-cool, as my factory warranty is just expiring- looking forward to this install , ill let u know how it goes, thanks for the info

Your welcome......
I have put about 10,000 miles on it since the install. The trans is running great and the temp (with about 5500 lbs behind me) has only gone up to 165 highest and that is at about 3500 rpm uphill - as soon as I level off (rpm to 2500) the temp comes right back down. The average outside temp at that time was between 90 and 95 and humid......

i'M hApPY ......hEe.....HeE.......hEE!!!!!!!

[aj_111_78]

I know this is old But I have a 1 question

My trans cooler burst on me this week I am going to install external trans cooler. If I flush everything real good will I still need to replace the radiator if I hook up the bypass?

I cought this early enough that I think I saved the trans but I will find out from the transmission shop soon . Sounds like I have a 50 /50 chance the warrenty company will cover all of this mess. lets hope for the best.