C13 running hot

Straight coolant or 50/50 mix?

 

You already said where I'd start.

With the fan on, engine running, will it hold a grease rag on the A/C condensor if you let it go?

You could also just use a flashlight to look through.

 

Hopefully you haven’t partly plugged your radiator. ‘A few gallons of green’ was a big time no-no. You should have flushed the system at least 3-4 times with straight water to get any trace of the old out, before the new.

 

"My next order of business will be to remove ac condenser and intercooler to blow out the radiator and see if that helps." If you are going to do that I would also use coil cleaner on the radiator, condensor and intercooler. It is sold in cans (Home Depot, Amazon...) and can also be purchased in gallon jugs and mixed in a sprayer.

 

That is mostly just going to flush out the radiator and not the block. Let it run out like you say and then close the drain and circulate by running the engine. Do that several times till it runs clear. On the final fill if you are not buying 50/50 but 100 percent antifreeze it is best to add distilled water.

 

No. Drain, refill(water),and run at high idle, turn and heater, in cab and sleeper, for at least 15 minutes, drain, do this 3 more times. You need all the old out, before the new. There are lots of places that coolant sits even removing the lower rad hose, heater cores, air compressor, etc, this will take a good couple hours to do correctly for a shade tree mechanic.