Stop in for a cup of coffee

Princess Valiant said

Nah it's not ATF because it's a rusty red and it's a manual transmission truck so there's no ATF in the radiator anyway

1995

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Gunk, heavy duty cooling system flush.
I did use simple green to clean a cooilng system after a cooler failed. That stuff did a fan tastic job!!
Transmission failed 3 months later.