Quote:
Originally Posted by diver dave
Lots of good explanations here.
What helped me understand the common 2-way cap is understand it has 2 valves, with different cracking pressures. The “outbound” high pressure spring wants to keep coolant IN the engine under 7 to 15 psi to raise the boiling point. The “inbound” spring/valve allows the cap to suck back in coolant that was expelled during engine warmup.
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Yes, this two way or double action cap is what I think I was wrestling with. But totally makes sense.
Thanks to everyone for all of the responses. One more thing I understand a little better now.