When we drained it to do the flushing there was hardly any anti-freeze in the
coolant. I went with about a 40% mix when I filled it back up. BTW, the
Nissan manual reccoments 40% anti-freeze. Before we flushed it it would
overheat
after idling for about 15 minutes. After flushing we ran it for about half an
hour and it was not quite up to 200 F. Didn't get a lot of stuff out of the
cooling system but it looks like enough.
keith
> Agree completely, datsunmike is right on. Antifreeze/coolant is lousy at
> conducting heat. A lot of people think they need lots of it to keep their
> engine cool, and end up with the opposite result by using a higher ratio
> than water in the mix. I generally run 40percent A/F or lower to 60percent
> water or higher, and never have problems even on the hottest of days.
>
> If someone has problems with overheating, try testing with 100percent water
> to see if it drastically drops the temperature. That might give a clue that
> you're using too much A/F. The primary reason for A/F is to raise the
> boiling temperature, as well as to lower the freezing temperature. Water
> does all the cooling. If it still overheats, you have other problems.
>
> Could be choked water passages because of casting debris in the water
> jackets, and/or crud build-up. Last engine I rebuilt had lots of casting
> debris, and is fine now after cleaning it out (especially with a recored
> rad). An improperly tuned engine could overheat the engine. One 1600 engine
> I had that overheated, had a hairline crack in the block. Secondary reasons
> for A/F is for anti-corrosion and to help lubricate the waterpump, so don't
> go with just water alone.
>
> Fred - SSF, CA
> '66 2L Lucy
> '70 1600 Blondie
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