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Old 10-04-2009, 04:55 PM   #59
ride5000
Scooby Guru
 
Member#: 32792
Join Date: Feb 2003
Chapter/Region: NESIC
Location: lincoln, ri
Vehicle:
2003 GGA MBP
12.9 / 105+

Default

if the physically lower (radiator) cap is the one with the lower cracking pressure, it will vent liquid coolant into the overflow when the pressure reaches the threshold.

if the physically upper (reservoir) cap is the one with the lower cracking pressure (as it should be) then it will vent air/vapor as the pressure reaches the threshold.

obviously the system should be completely filled with water, which is why the second scenario is proper.
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