Quote:
Originally Posted by Piwoslaw
IIRC the bleed hole is not just to de-air the system, but also to ensure the thermostat is not sitting in stagnant coolant, ie it is "up to date" with the current temperature of the engine?
Modern cars have sensora all over the engine and a heating element in the t-stat housing to open it when the ECU wants to, but those also should have a bleed hole as mechanical back-up.
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Great point! On some engines, I could see that being an issue. However, on the K series, the coolant bypass goes through the thermostat housing and continuously circulates coolant over the thermostat.
On something without continuous coolant circulation around the thermostat, I could see that being a major issue.
Anyways, I decided to block off the bypass hole this afternoon with a nut and screw and a little JB Weld around the head of the screw and on the threads to fully seal it and make sure it can't come loose. The thermostat is now completely sealed and no coolant can get through or around it while it's closed.
I plan on installing the new modded thermostat tomorrow and will report back with the results.