Bad Radiator?
#31
Lexus Test Driver
iTrader: (2)
On a full block most often the fluid expands but never violates the caps pressure rating. However, air in the system can turn to steam and when this happens, often times it does exceed the caps rating and vent to the reservoir.
If the reservoir is full and has a hose to the bottom, as the engine cools the fluid contracts forming a vacuum on the engine block side. The cap has a one way valve that opens and pulls fluid from the reservoir thus filling the block on the cool down cycle.
I tiny leak in the system can render this process inoperable.
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Vegasaurus (02-25-18)
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