How to Use the Thermagasket Set
The Thermagasket Plus Head and Block Treatment Set is a complete chemical system designed to repair blown head gaskets, cracked cylinder heads, and minor block damage. It includes everything needed to clean, treat, and seal your engine’s cooling and combustion pathways using RX Auto’s proven formula. Whether you're a professional mechanic or a confident DIYer, following each step precisely is key to achieving a strong, lasting seal.
This treatment is ideal for engines experiencing symptoms like overheating, coolant loss, white exhaust smoke, or combustion gases in the cooling system. It’s compatible with gasoline, diesel, and hybrid engines—including known problem platforms such as Cadillac Northstar, Subaru, and Jeep. In this guide, we’ll walk you through the full process: system prep, chemical application, engine cycling, and final flush. Done correctly, the Thermagasket Plus Head and Block Treatment Set restores performance, protects engine integrity, and gets you confidently back on the road.
The Thermagasket Treatment Process is Completed in 4 Easy Steps
Thermagasket can protect against cylinder compression and back pressure. There is no need to locate the cylinder that is causing the bubbling in the overflow tank or radiator.
Instructions
- Flush the cooling system with clean water.
- Add parts A and B of the Thermagasket Head and Block Treatment to the cooling system, top off the system with clean water, and replace the cap.
- Run the vehicle at operating temperature.
- If your vehicle is steaming, it will stop, usually within a few minutes of the vehicle reaching operating temperature.
- Water will stop getting into your oil and or cooling system
- If your vehicle is overheating because of the breached head gasket it will stop
- Once repaired, flush the cooling system and replace water & antifreeze/coolant