My roommate's 1991 W126 350SDL has either a bad head gasket or a cracked head. Or both. The fan blades cut a hole in the radiator and it lost its coolant and overheated. After repairing the cooling system, the engine acts like it has dead cylinders and idles poorly, smokes white out the exhaust, the upper radiator hose builds pressure fast when cold and holds pressure for hours after the engine is shut off, and smoke comes out of the coolant reservoir, even when cold. Oil and coolant aren't visibly mixing, though. The engine temperature also swings wildly and acceleration is poor.

So should I pour Bar's Leaks head gasket repair liquid into the cooling system and call it good? Are there any downsides to using it like clogs or it coating parts and causing overheating? We don't want to deal with the expense of replacing a head gasket, or worse; a head right now.

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles