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Super Moderator
Join Date: Jun 2004
Location: seattle, washington
Posts: 6,757
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are you talking about the coolant temperature sensor on top of the engine? if so, it's probably because that's the low pressure area (due to the water pump/coolant return path) so if you open that with the engine running it will suck in air.
the vent point is a high pressure area (on the other side of the water pump).
i'll bet if you open the sensor with a hot engine turned off, coolant will blow out. 
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'89 turbo-s (2.7, wolf3d ems, garrett dbb turbo, tial 46mm, etc. fast!)
Last edited by nize; 11-14-2025 at 11:32 AM..
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