CRC Thermocure Cooling System Rust Remover and Flush — 32 oz water-based, non-corrosive treatment for radiators & pumps

CRC Thermocure is a water-based, non-toxic cooling-system rust remover and flush that dissolves corrosion and flushes deposits from radiators, water pumps and engine passages.

Designed for automotive cooling systems, CRC Thermocure (Evapo-Rust Thermocure formula) targets rust and scale that contribute to poor heat transfer and overheating. The ready-to-use 32 oz bottle treats systems up to three gallons and uses a non-corrosive, non-flammable, water-based chemistry to soften and unlock iron oxide deposits without aggressive scrubbing. Follow the three-step application to remove rust, flush the system clean, and refill with the manufacturer-recommended coolant.

How do I use Thermocure to remove rust from my vehicle's cooling system?

Application is straightforward and requires no special tools: drain the old coolant, add the Thermocure solution, dilute with water, run or idle the engine for the recommended time, then drain and flush thoroughly. The treatment time can be brief or extended depending on rust severity.

• Drain existing coolant and debris from the radiator and overflow reservoir.
• Pour the 32 oz Thermocure bottle into the cooling system and top up with water (treats up to 3 gallons).
• Operate the vehicle for 3–4 hours, or leave the solution in overnight up to several days for heavy rust.
• Drain the solution and flush the system 3–4 times with clean water, then refill with the correct coolant mix.

Will Thermocure harm gaskets, hoses, or aluminum components?

Thermocure is formulated to be non-corrosive and water-based, reducing the risk to common cooling-system materials when used as directed. Always avoid prolonged contact beyond the recommended treatment window and follow the flush procedure to remove residues.

• Safe for typical rubber hoses and plastic reservoirs when used per instructions.
• Non-flammable and non-toxic formulation minimizes aggressive chemical exposure.
• If in doubt, consult the vehicle manufacturer or perform a spot compatibility check.
• Complete flushing after treatment protects sensitive components from leftover chemistry.

How effective is Thermocure at restoring cooling performance?

By dissolving iron-oxide buildup and loosening scale, Thermocure helps restore coolant flow and heat transfer, which can reduce temperature spikes caused by restricted passages. Results depend on the extent of internal damage and how thoroughly the system is flushed afterwards.

• Removes rust without scrubbing, reaching internal passages and water pump cavities.
• Treats systems up to three gallons with one 32 oz bottle for most cars and small trucks.
• Improves coolant circulation when deposits are the primary restriction, not mechanical failures.
• Follow-up flushes and fresh coolant provide optimal long-term performance.

Who is this for? CRC Thermocure is intended for vehicle owners, DIY mechanics, and service shops needing a safe, water-based rust remover for automotive cooling systems. It’s useful when rust or scale is impairing coolant flow, during routine cooling-system maintenance, or before replacing major components. Avoid use in systems with severe structural corrosion or active leaks; consult a technician when in doubt. Always follow vehicle manufacturer guidelines for coolant type and system capacity after treatment.

Ingredients

Thermocure is made of a non-toxic and water-based solution that is easy-to-use on automotive cooling systems. It is non-corrosive and non-flammable.