Either you cracked the housing because the t-stat wasn't sitting properly, or the gasket didn't seal because the surfaces wern't cleaned properly or it loose.
Recheck you work. Keep in mind, there is a small lip where the thermostat fits into. If not properly seated it will leak or crack the thermostat.
LEt me know what you find.
Joe
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Sunday, February 28th, 2010 AT 12:51 AM