what is this?
Melting Slicks
Joined: May 2004
Posts: 3,017
Likes: 2
It prevents air pockets from forming in the coolant, causing hot spots. I helped troubleshoot a boat motor that was "overheating" causing it to go into limp mode. Turned out an air pocket had formed under the temp sender and would not move. That air pocket would spike the temp from 180 to 230 in seconds! We had to drill a hole (in the same place as the pellet)in the thermostat to keep it from returning.
Safety Car
Joined: Sep 2008
Posts: 4,296
Likes: 156
From: Location: Location: kAnSaS
just an airbleed. Not neccecary if the system is bled right but is nice feature that most t-stat manufactures use these days. I have probably put in a thousand t-stats and they almost all have one.
It would be nice to if you had a leak and were adding to it until you could repair. fgood luck
It would be nice to if you had a leak and were adding to it until you could repair. fgood luck
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