Question about 2002 Mazda 626

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'02 626 overheated earlier in the week. drove home. appeared to be out of coolant. replaced overflow tank(seal blown), added coolant, however it still overheats. what else to check?

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Whenever you overheat once, then the thermostat must also be replaced. It is operated by the expansion of a contained wax pellet, and overheating causes permanent loss of wax.
However, you may also have caused a head gasket leak now from heat warpage. If the thermostat does not help, then borrow a cooling system pressure checker from a place like Autozone, and see of it holds pressure for 5 minutes after pumping it slightly above cap rating. Then start engine and see if it is steady or oscillating from 1 cylinder leakage.

Posted on Sep 04, 2010

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Posted on Jan 02, 2017

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