109K Coolant Change

Thanks man. I’ll be doing my first change here soon. 97K on my 15.

 

Yup did my 2013 with right at 100k miles this past dec 2019. Original coolant looked fantastic. But peace of mind for 30 bucks was well worth it for another 100k n 6 years.

 

After 5 years or 100,000 miles you should change it at half that interval there on out. You can do a simple drain and refill with the proper coolant, zerex or toyota.

 

Safety wire those drains while you are in there. Shit happens. If you let it.

 

You are doing way more than most. You are fine with your calculations.

The engineers that developed these power trains didn't plan on us owning these trucks past 10 years, so they have no data supporting long term ownership.

Dump the rad and refill. Do it a second time like you said and you will be doing the best job you can do.

Hint: don't bother with the drain valve. Pull the bottom drain hose and be done in ten minutes,including refill. Wear eye protection if you can't do this by feel.

 

This is the maintenance task for today.

I will try to access the block drains.....if not, then I will use the proposed process in post #1 to achieve the results in post #13.

Thanks for the tips and hints.

 

Ok.....well has turned into a PITA.

Radiator drained without issue. Accessed RH block drain, removed splash guard, place a tube to drain into a container, 10 mm socket+extensions, went lefty loosy......no loosy. Not even gonna attempt the LH block drain. Plan B is the serial dilution method as detailed. You know, it takes about 2 hours for the engine to cool..... anyhow. Tomorrow, I continue the process, 5 more quarts to cycle through.

While poking around in the engine bay, I noticed the radiator top had a lot of fore/aft movement. Hmmmmm...... more inspection. Great, just friggin' great. One of the mount bolts is missing and the other is loose. The loose one was loose because the "nut" was missing. I did get lucky, the missing "nut" was wedged in the body framework under the battery. Well, I guess this is a good find. I should be able to eliminate a squeak/rattle and possibly prevent a failure. I only need 1 bolt to fix this.

Anyone know what size that bolt is? I know I can remove the remaining one to measure, but I'd like to avoid that step. It was a bit of a bugger to install.