Will Bar's Leak Head Gasket Repair fix a blown head gasket in a 1997 Saturn SL?
== == * If water is going out the exhaust, it might. If the radiator is being pressurized, it will not.
* But Bar's Leak does not work!! It will further mess your problem up more. It is better to use a chemical called Thermaweld. (Note that Thermaweld's first Google result is about it being a rip off, and Bar's Leak makes more than one product. Some are for radiators and some are for head gaskets, and one is for cracked heads.)
There are two kinds on their website. One that can be used while coolant is still in the vehicle (Head Gasket Fix), and one that requires all coolant to be drained before it is used (Head Gasket Repair). One may work better than the other.
* No, it may plug the heater core. == == == ==
A blown gasket can be repaired by replacing the gasket...if you are talking about the head gasket, then you have to remove the cylinder head from the engine block and replace the gasket that is inbetween them. Cracked heads generally have to be replaced because they are made of aluminum which cannot be repaired permanently once it is cracked.
A thermostat gasket is a gasket for a thermostat, a head gasket is a head gasket. The top part of the engine needs to be disassembled to repair the head gasket. You can find information on your specific car in your local library. You may even be able to access this online if the library has the databases available.