2006 duramax overheating. Fan not coming on.

[dwrat]

Originally Posted by Q101ATFD

You got any proof to back that up before I look like an ass in front of my dealer?

I've had two of these trucks (6.0 and 6.6) that disengage the clutch at 45 MPH. Why else would there be a separate part number for the 4.10 and 3.73 differentials? They both worked fine at cooling at any speed below...

Yes, I will 100% guarantee you are 100% wrong as far as Duramax Diesels go. By the way Duramax/Allison 2500 & 3500 trucks only come in 3.73 differential.

[Q101ATFD]

Originally Posted by dwrat

Yes, I will 100% guarantee you are 100% wrong as far as Duramax Diesels go. By the way Duramax/Allison 2500 & 3500 trucks only come in 3.73 differential.

Well at this point, it's one person's word against another's. Unless you have something to back up your 'guarantee,' it doesn't mean a thing.

You totally missed my point, thinking that I said D/A's came with 4.10's - they never did.

Read this TSB, and try to actually think about what the words mean before you comment. Look, specifically at the "Cause" and "Correction" sections, where it mentions a "disengage speed."

The two part numbers, while for the LQ4, show that there is a dependency on engine speed (thus, vehicle speed), due to the GT4 and GT5 rear end ratios. There is only one part number for the Duramax because there's only one rear end ratio available - 3.73:1.

[heymccall]

Originally Posted by Q101ATFD

Read this TSB, and try to actually think about what the words mean before you comment. Look, specifically at the "Cause" and "Correction" sections, where it mentions a "disengage speed."

I read it, and nowhere does speed "imply" road speed. Maybe my glasses are too "rosy", but they are providing a replacement clutch that applies and remains applied at a lower airflow temperature. Their nomenclature leaves a lot to be desired. Perhaps reading this link http://www.haydenauto.com/Featured%2...s/Content.aspx at the bottom of the "thermal fan clutch" section will shed some light.

Some Chevrolet/ GMC truck models (of fan clutch) are specifically designed to engage at lower temperatures than the original equipment parts that they replace.

Which correlates to the interrupted grille airflow mentioned in the link provided by Q101ATFD.

[dwrat]

Originally Posted by Q101ATFD

Well at this point, it's one person's word against another's. Unless you have something to back up your 'guarantee,' it doesn't mean a thing.

You totally missed my point, thinking that I said D/A's came with 4.10's - they never did.

Read this TSB, and try to actually think about what the words mean before you comment. Look, specifically at the "Cause" and "Correction" sections, where it mentions a "disengage speed."

The two part numbers, while for the LQ4, show that there is a dependency on engine speed (thus, vehicle speed), due to the GT4 and GT5 rear end ratios. There is only one part number for the Duramax because there's only one rear end ratio available - 3.73:1.

I was trying to be nice to you but since you stated for me to try not to comment before understanding, everything is different now.

OK, as for not commenting about something how about you not commenting about something you know nothing about.
Your totally talking out of your azz on the fan issue.
How about you post up a poll on this site and see how smart you are about the fan operation.

Better yet how about you put money where your mouth is and lets do a run here in AZ in my Duramax or any other properly operating Duramax.

How about $1,000 cash and I say the fan comes on at any speed due to heat.


Maybe in time you will realize I am one of the original over heater on this site that all started in 2004 and I know how the fan does and does not work Junior.

Any more smart azz comments let take it to PMs please.

[Q101ATFD]

mccall, engine speed is directly correlated to road speed, and vice versa. So, yes, it does imply that engine speed (road speed) has something to do with the operation of the fan clutch. Everything is mechanically linked, so the speed of any one component on the drivetrain is related to that of every other one.

As for dwrat, I was just asking for proof - if you read in the first post I made to you, I was ready to go see my dealer for a new clutch if you had something to back your claim. I thought your "original over heater" issue was fixed by a new radiator and some cold air mod - nothing to do with the fan.

And putting a poll up measures how smart, or dumb, everybody is, except for me.

[dwrat]

Originally Posted by Q101ATFD

mccall, engine speed is directly correlated to road speed, and vice versa. So, yes, it does imply that engine speed (road speed) has something to do with the operation of the fan clutch. Everything is mechanically linked, so the speed of any one component on the drivetrain is related to that of every other one.

As for dwrat, I was just asking for proof - if you read in the first post I made to you, I was ready to go see my dealer for a new clutch if you had something to back your claim. I thought your "original over heater" issue was fixed by a new radiator and some cold air mod - nothing to do with the fan.

And putting a poll up measures how smart, or dumb, everybody is, except for me.

No my problem was fixed with GM giving me a new 2006 LBZ.
If your fan shuts off over 45 mph and your temps are still high your fan clutch is not working as designed.
My 2004 fan ran all the time in the summer when towing, it didn't matter how fast I was going. I would never be going under 45 but more like 65-70 and at times as high as 80.
I am 100% sure your fan should not turn off when locked due to high heat at any speed what so ever.
Are you located in AZ by chance?
If so I will provide you with proof as you need.

[Q101ATFD]

That is the explanation I was looking for. No hard feelings, that's all I wanted to know. I'll be calling my dealer to have them look into the problem. Unfortunately, I'm about 30 hours East of you. No hard feelings, but I'm curious if you've ever had the fan engage on your LBZ above 45 MPH - I know the cooling system is better, so there's less chance of the temp going up, but still curious.

[heymccall]

Originally Posted by Q101ATFD

mccall, engine speed is directly correlated to road speed, and vice versa. So, yes, it does imply that engine speed (road speed) has something to do with the operation of the fan clutch. Everything is mechanically linked, so the speed of any one component on the drivetrain is related to that of every other one.

I'm gonna try this one more time. GM's bulletin is VERY poorly written as their reference to "SPEED" is wrong, as is their reference to lower and higher.

I have personally driven most of my fleet through PA mountains loaded, and I can assure you that the fan clutch engages due to radiator induced heat, regardless of road speed. It will engage at 80 mph on a big, long, easy pull as easily as it will when pulling very heavy in 2nd gear up a steeper mountain.

How can a mechanically simple device, activated only by Heat and Spinning, react differently to:

240 deg airflow @ 2700RPM in top gear
vs.
240 deg airflow @ 2700RPM in 2nd gear

There is clearly no correspondence between road speed and disabling of the fan clutch.(Where is the "beating a dead horse" emoticon????)

[dwrat]

Here is your "proof"
http://videos.streetfire.net/video/L...suit_92219.htm

Watch the video and tell me what he says about the fan running at about 2:45 and about 4:30.
Also let me know what he says about his speed.

Please reply to me as soon as you view the video.

Dan

[Jasondt2001]

Originally Posted by Q101ATFD

mccall, engine speed is directly correlated to road speed, and vice versa. So, yes, it does imply that engine speed (road speed) has something to do with the operation of the fan clutch. Everything is mechanically linked, so the speed of any one component on the drivetrain is related to that of every other one.

LOL - being mechanically linked is all fine and good... The fan has NO electronics going to it so how does it know the difference of 70 mph @ say 1900 RPMS in 6th or 29 mph at 1900 RPMS in 3rd...
The only thing the MECHANICAL fan sees is it's spinning at 1900 RPM, doesn't care if it's doing 9 or 99 mph...

So since you state everything is mechanically linked, is there an output shaft of some kind on the back of the tranny linking itself to the fan that I'm missing somewhere telling it to cut out at 60???