VanKo

I don’t know the service history of my van so I’m doing PM items before a long trip. I want to flush the cooling system (Dexcool) but am finding conflicting answers on how to do this as it doesn’t sound like a simple drain, flush, refill like on older cars. I’d rather not screw something up so I’m thinking of just taking it to a dealership. Is this a waste of money or is this procedure easier than it appears? Also, I’m in the South but plan on being in the North for the winter. Do I need a different mixture ratio of the Dexcool for colder temps?

pomerlo

Here is what the service manual says ( open the attachement)
The fluid capacity for a 6.0 L is 14 Liters of 50/50 mixture distilled water and Dexcool
No matter where you are... it must be the same mixture ratio.
FlushAndRefill.pdf

VanKo

That’s awesome, thank you!

mountainmanjoe

Do it yourself.

https://chevroletforum.com/forum/exp...e4/#post430529

mountainmanjoe

This procedure is for a 2004. It will not work for a 2013 because cooling systems were re-engineered. The thermostats have moved and work differently now.

Don't bother removing the engine block drain plug. It's probably a huge PITA and totally unnecessary.

VanKo

This is where I was confused. I’ve read multiple conflicting methods, but they must be between these two designs.

VanKo

Great pics and write-up. Do you have the 6.0l? I’m a bit confused as to where the flush tee goes - where are the two streams of water going from each side of the tee?

pomerlo

My bad ... I was sure your van was a 2006.

So in this case yes ignore the procedure. Will try to get the one for the 2013

mountainmanjoe

I have a 5.3l engine. I’m sure the procedure is the same. The “t” goes on either heater hose. Water goes through the block and out the radiator

VanKo

Does the T send water to two places at once?