car was blowing cold air, put in new theromstat, now losing antifreez, dont know where, but fill up tank, next day empty, still blowing cold air
Check your hose connections and t-stat housing gasket. its possible it wont leak until its under pressure while driving. if you didn't have this problem before replacing the Tstat, then its likely this repair didn't go back together as well as you planned
The blowing cold air issue could be related to a blend-door actuator failure in the heater box, not necessarily the T-stat
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