2011 and up duramax

[tcartwri]

well, there must be a different formulation for urea north of the border, because it does not freeze here.

 

[Diamondpilot]

Boy Ford really is special. The urea some how will not freeze in a ford but will in other trucks, right. It's like ford is magic to some people.

Learn to read and figure out how the systems work before you spout off.


Fords system scavenger the fluid out of the lines back to the tank at shut down. GM's does not. The way Ford did it gives the in tank heater a chance to heat ALL the fluid.

GM's has a heater in the tank but the issue is it will freeze in the lines.

Education? Typical __________....

Chris

 

[Diamondpilot]

Or they have just done a better job at heating the urea tank and then teaching the ECU when the urea is unavailable (from being frozen) so that it doesn't try to use urea and fail (causing limp home mode and other such niceties).

Aaron Z

Ding ding ding. Winner here.

The scavenging of the lines is the key. All have in tank heaters and ECM's programed to prevent regen with a frozen tank but in extreme conditions the in tank heater on the GM's cannot transfer enough heat to thaw the lines.

Chris

 

[AKfish]

I have observed UREA re-fills at -30C. It was still liquid. That's -22F....

While Urea contains ammonia (NH3), the compound in DEF is Ammonia Hydroxide - not Urea - Ammonia Nitrate. Urea is an explosive compound in certain applications - situations. You wouldn't want Urea to be injected into the exhaust of your truck...

Ammonia Hydroxide is Ammonia and water. It freezes! And, while it has a freezing point a bit lower than straight water - it begins to get thicker - the closer to 32F it gets.

AKfish

 

[AKfish]

Ding ding ding. Winner here.

The scavenging of the lines is the key. All have in tank heaters and ECM's programed to prevent regen with a frozen tank but in extreme conditions the in tank heater on the GM's cannot transfer enough heat to thaw the lines.

Chris

Really... Do you have a stack of Ford sales brochures on your desk??

AKfish

 

[Diamondpilot]

Really... Do you have a stack of Ford sales brochures on your desk??

AKfish

No. I do have a couple of the popular ones on my phone though. I have researched each and every year of truck for about the last 20 years when I took up towing as a side business.

I bet I get a call every 2-3 days from one of my customers. Its amazing how little the general public and even worse the sales people know.

Had a guy call me yesterday about a Eco Boost. Dealer told him the tow rating was 7,700#. I told him to find another dealer because that was the GVWR. The actual tow rating was 11,200#

My real job gives me plenty of time to study these trucks.

 

[tcartwri]

While Urea contains ammonia (NH3), the compound in DEF is Ammonia Hydroxide - not Urea - Ammonia Nitrate. Urea is an explosive compound in certain applications - situations. You wouldn't want Urea to be injected into the exhaust of your truck...

Ammonia Hydroxide is Ammonia and water. It freezes! And, while it has a freezing point a bit lower than straight water - it begins to get thicker - the closer to 32F it gets.

AKfish

Diesel_exhaust_fluid

Diesel Exhaust Fluid (DEF) is an aqueous urea solution blended with 32.5% high purity urea and 67.5% deionized water. DEF solution is used in Selective Catalytic Reduction (SCR) to lower NOx concentration in the exhaust emissions of diesel engines.

It also does not begin to freeze until -12C ( minus not plus ) Well below the freezing point of water.

I HAVE HELD THIS STUFF IN MY OWN HANDS IN THE MIDDLE OF WINTER. I DOES NOT FREEZE.

 

[AKfish]

Diesel_exhaust_fluid

Diesel Exhaust Fluid (DEF) is an aqueous urea solution blended with 32.5% high purity urea and 67.5% deionized water. DEF solution is used in Selective Catalytic Reduction (SCR) to lower NOx concentration in the exhaust emissions of diesel engines.

It also does not begin to freeze until -12C ( minus not plus ) Well below the freezing point of water.

I HAVE HELD THIS STUFF IN MY OWN HANDS IN THE MIDDLE OF WINTER. I DOES NOT FREEZE.

Well.. I stand partially corrected.. It's 1/3 urea and 2/3 water. Water freezes. That's why the manufacturer's install heating systems. It does freeze!

AKfish