Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - Thermostat housing leak
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Old 12-23-2012, 06:22 PM   #41
emsvitil
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I found another leak point. The cylinder head corrodes at where the thermostat housing goes:

http://www.focusfanatics.com/forum/showthread.php?t=303682


Ultra black RTV smeared on the head (after removing corrosion), the thermostat housing groove (before o-ring), and over the thermostat housing and o-ring fixed the leak.
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