Chemical sealers are a temporary fix at best, and generally not recommended. They might temporarily slow down the leak, but they often clog cooling passages, making the problem worse in the long run. They rarely fix the underlying issue (the damaged head gasket). A more serious problem might develop because of the poor quality of these sealers. Using a sealer might delay necessary repairs until the engine is further damaged.
What to do:
1. Get a proper diagnosis: Take your car to a qualified mechanic. They can perform a compression test and a leak-down test to confirm the head gasket is blown. These tests definitively determine if combustion pressure is leaking into the cooling system. They might also conduct a cooling system pressure test to confirm if there's a leak in the cooling system.
2. Don't drive the car: Continuing to drive with a blown head gasket will likely cause further damage, potentially leading to catastrophic engine failure. The antifreeze can cause serious internal engine damage over time.
3. Consider the repair costs: Replacing a head gasket is a significant repair, often involving labor and parts. Get multiple quotes from reputable mechanics to compare costs before proceeding.
In short, while a chemical sealer might seem like a cheap solution, the risks of further engine damage significantly outweigh the potential benefits. A proper diagnosis and repair are necessary to resolve the problem correctly.
