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Never saw a check ball built in.
Did some searching on other vehicle forums and it was mentioned that drilling a hole can really affect warm up time in the winter.
Quote from: Keith_C on July 18, 2011, 03:51:01 PMDid some searching on other vehicle forums and it was mentioned that drilling a hole can really affect warm up time in the winter.Negatively, right? Maybe since the coolant circulates through the hole it takes longer for the coolant to warm up enough to crack open the thermostat?
Some thermostats will have a giggle valve in the mounting plate. This valve is not an indication of the quality of the thermostat, but merely an added feature. The valve is oriented at the top when installed in a vertical position. Its true function is to allow air to escape from the top of the cooling system, aiding filling, and avoiding steam pockets. If your thermostat does not come with a giggle valve, a 1/16" drilled hole near the outer diameter of the plate will work with the same effect.
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