Having problems with your 2003 Chevrolet Impala ?
Looking at change out the coolant sensor car is over heating but first it will blow cool air before it over heats when it finals blows hot air and the therostate opens up it goes back down we have changed the therostate need to change before the head caste blows
It sounds like you have a head gasket leak or an intake manifold antifreese leak. Have a coolant system pressure test performed to determine where & the extent of the leak. The 2003 impala is noted for this problem. Good luck!
Repair Help & Product Troubleshooting for 2003 Chevrolet Impala
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