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I changed my thermostat and my upper housing started leaking so I changed it and now its leaking between the two housings. Is there a gasket that goes between the two. I know there is an O ring type gasket that goes around the thermostat but what about in between the two housings? I tried silicone and it didn't work. All that the auto parts stores show it having just the o ring for the thermostat.
 

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just an therm o ring....the housing may be bad ...when I changed mine I used the therm o ring and some sealant around the edges no leaks....
 

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Make sure the ears (where the bolts go through) of the thermostat upper housing are bent up just a tad (put the housing on a flat surface to check) prior to bolting it down. Cheers!
 

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I had the same issue. I used a high temp RTV sealant. Cured.
 
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