" I have an 81 380sl that tends to run hot in the summer, and I
heard that water is a much better coolant than anti-freeze. So I was
wondering if diluting my coolant would cause my car to to run cooler
in hot weather. "
IMO, any diff in cooling capacity will be minimal. Instead you will
lower the boiling point and increase corrosion. Why don't you find out
why it's running hot. Bad theromostat? Collapsing hoses? Plugged
No it will run hotter and boil over more easily. Colligative
properties, just like high school chemistry. The antifreeze raises the
boiling point of water, allowing it to remain in a liquid state and
Water is worse the properly mixed coolant for cooling your engine.
Do make sure your coolant is properly mixed though...
70% water and 30% coolant is acceptable. water is the main heat
dispersant... so too thick of coolant is negative for heat transfer.
People kept forgetting it is not only the coolant that raises the boiling
temp... pressure is the main reason why boiling temp is much higher.
I would also clean your radiator fins... use water or air and blow/spray
from enigne side to front to loosen any bugs/dirt that might clogg your
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