I happened to be speaking to a Gates rep about a month or so ago and the subject of jiggle pins came up. I told him about the 1/8" hole in the flange suggestion that I'd read about on Stovebolt. He explained that a jiggle pin actually works like a check valve that will only allow air to pass through it, not coolant. When coolant reaches the jiggle pin under pressure, it seats against the thermostat flange to block coolant flow past the thermostat when the thermostat is closed.
Not saying that the 1/8" hole is a bad idea. Just sharing what I learned about jiggle pins from the Gates guy. I am sure that it would be cheaper for them to punch a hole through the flange instead of adding a copper jiggle pin.
Probably more than anyone ever wanted to know about jiggle pins, but thought it was worth sharing.
Matt
Last edited by Maybellene; 04/29/2016 10:54 PM.
