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Q: what does it mean when my 2004 Buick Rainier says coolant to hot on 2004 Buick Rainier

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Explanation should be in you owner's manual, I am afraid I am not experienced with the Rainier. Check here or try this link you may be able to down load a free copy of the owner's manual for your vehicle
it is most likely overheating. you should get it checked asap before you do internal damage to the motor.
check the coolant level to see if you need to add.

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