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Q:

replace thermostat or change motor on 1996 Infiniti I30

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
my car ran hot and shut itslef off because someone put stop leak in with the coolant. should i replace the thermostat or just replace the motor incase of a blown head gasket?
(1) Answer
I can see where it would shut down because of overheating. I don't see where it would shut off because of the stop leak unless it has caused a major clog to coolant flow and that caused the overheat. I would recommend replacing thermostat any time the engine is overheated and then diag for what is needed and go from there.