Reply to "Cooling system over pressurized"

mike the snake (Guest)

When I got my car, the expansion tank had a sealed cap, effetively sealing the entire system.

The temps on my gauge bang between 150 and 180, nowhere near boiling.

I'd like to confirm that if I put a hole in my expansion cap, that nothing will change about how my car runs, since it's been running this way for the last 30 years.

I'd like to put things the way they are supposed to be, and what I read, the expansion tank should be allowed to breathe. The radiator cap on the main tank does it's job properly and fills or sucks in what's needed (correct?) but with a sealed system, this isn't happening, because it's all held in suspension because no pressure differences are allowed with the expansion tank cap being sealed.

SO, the car runs and functions fine, should I mess with something that aint broke, or should i put a hole on a cap or get a cap that allows venting on my expansion tank?

8/23/154:39 PM

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