Thread: Not this again.
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Old 10-15-2017, 05:18 PM   #1206
sweetbmxrider
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STFU, Mike.





Quote:
Originally Posted by LS1ow View Post
Refresh me, rad has 2 ports near the cap. 1 above the other. Assuming 1 goes to the overflow and 1 goes to the steam vent?

Upper to Vent
lower to overflow
Top port is almost always an overflow. Just think, the rad cap has a spring pushing the rubber gasket downward. When the system creates enough pressure, the gasket is pushed upward toward cap allowing the pressure/coolant to bleed off into the overflow.
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