Hello to all, have been on other forums but have not been here before. I guess what brings me here is the LLY problem with the overheating. I didn't think that it would happen to me. After driving and towing over the last couple of years I have not had much problem with overheating, well just reciently a trip to the NC Mt's that ended that record. I could not climb any of those grades without the temp gauge crawling up and that Fan noise was so bad, I have heard it come on before but just for a little time and it was off, but this time it just stayed on most of the time.
I'll not go over the same things as you already know, GM just kinda smiles and said we can't find anything wrong.. After reading these post and Sticky I wonder where they have been, musta had thier head in a bucket or something. Now I have a decision to make, Fix, Trade or just hope I can make it over that next hill...Has anyone tried this TD-EOC, will it work? How has GM gotten away with this, why not a Class Action Suit?
Since I am new I will not bore you with any more of my situation... Thanks

are you overheating because of lack of coolant? if you are towing under 12000lbs you should not be overheating. i am confused on why so many trucks are overheating. i have driven up hills and every where else in one hundred degree heat and no problems ( granted i have not towed with my truck yet in these conditons). please elaborate on the situation.

are you overheating because of lack of coolant? if you are towing under 12000lbs you should not be overheating. i am confused on why so many trucks are overheating. i have driven up hills and every where else in one hundred degree heat and no problems ( granted i have not towed with my truck yet in these conditons). please elaborate on the situation.
No no low on Coolant, and only towing about 12000lb, If not towing my truck runs cool, just when you put the 5th wheel behind it in hilly terrain.

i too have this same problem, i have only been towing 7000lbs and when i am pulling steep hills my truck has hit 245* and this is with the ecm reading with the edge. way too hot!! im my opinion. never low on coolant, with all my mods nothing helped with temps only egt's and they are way too hot still. i think i am going to get rid of my truck soon i tow with it too much and i do not want to have to worry about a overheating truck i just want to go camping and enjoy my weekends. so far my GM product has not performed as well as everybody says they should im not impressed with the truck at all!! but not all of them are overheaters i just happend to be a lucky one, JMO.

TxChristopher's radiator mod appears to make a huge difference, if you are looking for a way to address the overheating problem on your truck yourself.

As far as a class action, I don't know that it has been attempted. A suitable law firm would have to be interested in the cause of action and then engaged by representatives of the class. Keep in mind that the typical financial beneficiaries of a class action lawsuit are the attorneys. The settlements are usually spread among such a large class that there is little to be gained, or the settlement consists of token rebates toward a replacement vehicle.

Hello to all, have been on other forums but have not been here before. I guess what brings me here is the LLY problem with the overheating. I didn't think that it would happen to me. After driving and towing over the last couple of years I have not had much problem with overheating, well just reciently a trip to the NC Mt's that ended that record. I could not climb any of those grades without the temp gauge crawling up and that Fan noise was so bad, I have heard it come on before but just for a little time and it was off, but this time it just stayed on most of the time.
I'll not go over the same things as you already know, GM just kinda smiles and said we can't find anything wrong.. After reading these post and Sticky I wonder where they have been, musta had thier head in a bucket or something. Now I have a decision to make, Fix, Trade or just hope I can make it over that next hill...Has anyone tried this TD-EOC, will it work? How has GM gotten away with this, why not a Class Action Suit?
Since I am new I will not bore you with any more of my situation... Thanks

I feel sorry for you. Gm should pony up and fix ALL llys, but they haven't.

I have a 04.5 and my dad has an 05 and both exhibit the same behavior when pushed hard basically if pushed long enough they will overheat. It is my opinion that all lly will overheat if put in the right conditions. That said, I bought a v2 radiator mod from Coolmyduramax. I no longer can overheat the truck, and I never ever hear the fan while driving unloaded. It has made my truck so much more enjoyable to drive. To boot I gained around 1.5 mpg.

IMHO I would spend 1300 clams for the v2. It is cheaper than trying to trade for a different truck and does exactly what it claims to do. Stop overheating.

Just my $.02

Not to be biased as I have the same LLY but I would hang on to it. The problem takes effect while towing on grades with a high outside temp. The V cool TXCHRISTOPHER designed apparently fixes the problem. You could read about hundreds of happy customers here. Yes it is expensive but the hit you would take on a trade in will be much worse. So IMO spend the 1K and fix and forget the overheating problem. The V cool will be my next major ($$) mod for my LLY. Also I would rather have an 05 than an 07 or 08. Less smog crap and such.

Im not towing yet so I havent had the need.

At any rate welcome to the best forum for our trucks! ;)


Good luck

I have not made any decisions yet, I get a little flustrated when you try to tell some one something and they don't seem to understand.(meaning GM). You would think that my truck is the only one that does the overheating. To top it off I think the Customer Rep from GM only sent me to the Dealer so they would have a record that it had been checked by a certified machanic? I specificly told them and it was on the file that it only heated when towing on long grades. So when I got the trucks back with the Invoice it stated that the Service Mg. personlly drove the truck and could not find anything wrong, it was not connected to any thing to tow., so the customer rep from GM calls me back and said there was nothing wrong. DAH, so when I questioned the service mgr., he said there is nothing I can do for you and hung up....go figure

I have not made any decisions yet, I get a little flustrated when you try to tell some one something and they don't seem to understand.(meaning GM). You would think that my truck is the only one that does the overheating. To top it off I think the Customer Rep from GM only sent me to the Dealer so they would have a record that it had been checked by a certified machanic? I specificly told them and it was on the file that it only heated when towing on long grades. So when I got the trucks back with the Invoice it stated that the Service Mg. personlly drove the truck and could not find anything wrong, it was not connected to any thing to tow., so the customer rep from GM calls me back and said there was nothing wrong. DAH, so when I questioned the service mgr., he said there is nothing I can do for you and hung up....go figure

Partner I have read every thread on the OH issues of the LLY. I know how frustrating it is! A $1000 is a lot of money then again it is also not a lot of money. A dealer could charge close to that for a 50K tune up. My advice (which I wish I had followed) to you would be just get the V2 kit and install it yourself (low intermediate skill level job) and be done with it. You will get nowhere with it with GM. Its not worth the waste of time even thinking about it. Sometimes you gotta pick and choose your battles and this one is lost from the start. Let GM know in posts like this one that your next truck wont be a GM. All you can do...

It can be pushed to over heat, with enough trailer tied on, enough grade long enough to make it work.

The up grades ( I don't have them) likely would solve your problems.

But my point is that for the few times that you have to back off the throttle to keep the temperature under control, may be the easiest way to go. The only time the temp ran up was the climb out of Vail on I-70. Then my speed was 25-30 like all other heavy vehicles, no 55 like some seem to think is necessary. Half an hour later all was cool, no throttle and downhill to Denver.

I have played with the temps using a direct read scanner watching the ECM and the dash gauge if goofy. Need some good gauges, EGT, and direct read water to get the real story.

It can be pushed to over heat, with enough trailer tied on, enough grade long enough to make it work.

The up grades ( I don't have them) likely would solve your problems.

But my point is that for the few times that you have to back off the throttle to keep the temperature under control, may be the easiest way to go. The only time the temp ran up was the climb out of Vail on I-70. Then my speed was 25-30 like all other heavy vehicles, no 55 like some seem to think is necessary. Half an hour later all was cool, no throttle and downhill to Denver.

I have played with the temps using a direct read scanner watching the ECM and the dash gauge if goofy. Need some good gauges, EGT, and direct read water to get the real story.
Thats all good advice, but when you say back off the throttle do you mean walk and push?, when you get into that situation with 18wheels all over you and the truck starts to shut down is not a pretty situation, I guess my option would be to get a really small 5er...I will always fight for what is right, I have owned probably 10/12 new GM vehicles and I believe that they will eventually fix this truck to my satisfaction.. maybe I am dreaming but we will see...I sized my 5th wheel to match this truck and I know there are people that are pulling more than I am, I can also understand a power loss when on a grade but not the overheating...

Dream on............ If your up for a long fight, GM may offer a buy back, but you will likely spend more time, heartache, and money than you would for a V2. The LLY is an exellent motor, the cooling system is just a bit undersized. For $1k your (near) overheating days will be history.

What I mean MYTIME is that if you hook onto the trailer, shift to drive and stand on the throttle - it will overheat.

The temps will vary but I use tow-haul all the time the trailer is on, keep trany temp down and has a large effect on engine temp. And I use the tuner to monitor the water temp as the ECM sees it and the estimated power setting as the ECM calculates it. Into a climb 80-100% power setting will heat the engine in a hurry espesially when the intake air temp is high - 200+ degrees under the hood (monitor that too). Temperature will run up soo fast it seems to never stop rising. 50 - 70% power setting and the temp will creep up, the fan will lock at about 215 degrees. If the pull is hard enough the speed seems to settle about 2500 RPM in second gear convertor locked, doing about 25 miles an hour, water about 225 degrees, no steam. If I stand on the power about then it will shift to first, unlock the convertor and then I have no control of the temps, and it is tough to get off the throttle enough to get up into second gear.

It seems IMHO that the General designed that truck to run on the flat land, lots of air on the grill at 80 MPH with the trailer on. 110 degrees across the desert and it hardly see 210 of water temp with the power setting about 80%.

Haven't walked yet. I pull a 13,000 lbs. trailer with a combination weight of about 22,000 lbs. Weights from a couple of different scales.

Hope the info helps MYTIME.

are you overheating because of lack of coolant? if you are towing under 12000lbs you should not be overheating. i am confused on why so many trucks are overheating. i have driven up hills and every where else in one hundred degree heat and no problems ( granted i have not towed with my truck yet in these conditons). please elaborate on the situation.
And the bold is why you have no overheating issues:D

Thats all good advice, but when you say back off the throttle do you mean walk and push?, when you get into that situation with 18wheels all over you and the truck starts to shut down is not a pretty situation, I guess my option would be to get a really small 5er...I will always fight for what is right, I have owned probably 10/12 new GM vehicles and I believe that they will eventually fix this truck to my satisfaction.. maybe I am dreaming but we will see...I sized my 5th wheel to match this truck and I know there are people that are pulling more than I am, I can also understand a power loss when on a grade but not the overheating...

To the best of my Knowledge GM has yet to fix this trouble. They have tried with several service bullitens, 06 air box and such.

They have bought several back, it is a long hard fight. I know, but worth it I have an 06 for the efforts.

I remember towing with my Ford and passing Chevy's on the long steep hills. I allways thought it was a slow driver. I guess it might have been more. The Ford was awesom for towing power and never overheated but after 4 transmissions I went to the Duramax. Sounds like a radiator mod is the way to go.

Does this happen with all the LLY's or just a few? Ive read that this is the only downside on them.
(We havent pulled anything yet, but Im sure we will eventually. weve got a car trailer with toys. )
Also if you put in this new mod ... the COOL Option...is your warrenty effected?

Theres a video in the OT about this problem txchristophers truck overheating, he won his law suit with the video....ill see if i can find it.

naw cant find it, youll have to ask txchristopher(sp?).. its a long video but it may answer your questions. good luck.

http://videos.streetfire.net/video/b108e8c2-25df-4054-8090-98af013f4333.htm

:)

I still laugh, and so did eveyone else at the hearing even the GM guys and the judge, when I said "Hey my A/C is back on, thats great!"

LOL!!!!! :D

I guess there are limits to what any vehicle will do. I have driven more than a few including up to 60 ton gross weight and servre stop and go at low speeds. All three 3/4 - 1 ton diesel makes have a short coming that will leave you on the side of the road when you find the problem. They've all done it.

I'll watch the temperature rather than buy trannys or steam the coolant.

I can solve any of your overheating problems, I will trade you for my truck!
The LB7 does not have the overheating problems.......I wish 1K will fix the LB7 weak link for good.........

I can solve any of your overheating problems, I will trade you for my truck!
The LB7 does not have the overheating problems.......I wish 1K will fix the LB7 weak link for good.........

Would that problem be injectors? oh wait there are those who swear up and down injectors are not a problem. So I guess that means that lb7 don't have a week link. :D

I'll watch the temperature rather than buy trannys or steam the coolant.

Not me, I will fix the problem, be it a new truck or a Fix such as the V-2 mod.

When you have pulled the Same exact load up the same exact mountains in two previous GM trucks, both rated for less load than the 05, with out having to watch the temperature why should you have to with a more capable truck????

96 GMC rated for 20K, so I was pulling overloaded by about 1.5K, never got over 215

01 GMC duramax rated for 22K, so I was 500 pounds under max, never overheated or got over 215.

05 GMC duramax rated for 23.5K, so I was 2k under max, over heated, puked coolant.

06 GMC duramax for 23.5K, so 2k under max, never overheated. Max temp to date 220.

So again why should I accept the 05 as ok?

I still laugh, and so did eveyone else at the hearing even the GM guys and the judge, when I said "Hey my A/C is back on, thats great!"

LOL!!!!! :D

Hey TX what was the final result of your lawsuit? has anyone else sued? what did you get for compensation?

Dream on............ If your up for a long fight, GM may offer a buy back, but you will likely spend more time, heartache, and money than you would for a V2. The LLY is an exellent motor, the cooling system is just a bit undersized. For $1k your (near) overheating days will be history.X2. The factory cooling system is just too small on the LLY. The factory fix is to install the whole LBZ cooling system. Good luck getting them to do it though. Getting rid of the VVT can also make a HUGE difference on reducing the tendency to overheat. I think the VVT along with the egr cooler is the root of the problem. When I installed the GT4088 on my LLY yhe temp never got past 220 towing. Would hit 235+ before. That was pulling 10K with alot of wind drag, in the mountians of CO.

You need to see this thread. We asked that no more threads be started regarding the LLY overheating issues...

http://www.dieselplace.com/forum/showthread.php?t=170192