Hook up the overflow tank. It is one of the best ideas that ever came
along. First of all with it the radiator is kept full without any air.
Also you don't suck dust and stuff back into the radiator. After a
couple years it is amazing how much dirt there is in the bottom of the
overflow tank. Most new vehicles have the overflow connected directly
to the radiator and the pressure cap is on the overflow tank.
My Duramax says the coolant is good for 100,000 miles. I will have to
see that to believe it.
Pressure caps on the new vehicles are better at releasing the pressure too.
I'll have to find a new rat cap with the lever to release the pressure.
I'll also have to visit the used do-it-yourself dealer to get a cap for my
BTW it was -10 this morning and the truck started no problem, and cooled off
just as usual.
The annoying part is that "usual" is "bouncing back and forth between 210
and 235, and sometimes between 210 and 260"
The cardboard is something you use while the truck's running to prevent the
stuff that's flowing thru the radiator from turning to slush. If I remember
correctly, the rule is to leave 10% of the surface area uncovered. Haven't
you seen the big rigs and their custom vinyl covers for the front of the
truck in the wintertime? Ever wonder why they've got 'em? It's so that
they can have warm inside the cab....
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