MotoRad® - Fail Safe Series™ Engine Coolant Thermostat

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  • Once the Fail-Safe thermostat has locked in the open position, it must be replaced and cannot be used again.
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Product Details

Fail Safe Series™ Engine Coolant Thermostat by MotoRad®. Temperature: 180 Degree. Fail-Safe Thermostats offer premium, patented technology for superior protection over any thermostat on the market. Only Fail-Safe is designed to lock in the open position when overheating occurs due to a failing cooling system component. This allows maximum coolant flow, thus preventing expensive engine damage.

Notes: Once the Fail-Safe thermostat has locked in the open position, it must be replaced and cannot be used again.


  • Exclusive, patented design
  • High quality Stainless Steel and Copper construction
  • Locking technology prevents costly engine damage
  • 100% tested and calibrated
  • Manufactured with the highest quality materials from an OE supplier

Fail-Safe is designed to help protect your engine when overheating occurs. When overheating occurs, Fail-Safe automatically locks in the open position to permit maximum coolant flow. When standard thermostats fail, they lock in the closed position and prevent coolant flow to the engine, which can possibly cause serious damage to your engine. Fail-Safe has a patented safeguard against overheating damage. Fail-Safe thermostats are designed with a unique extra stroke that allows operation in two stages: Stage 1: Within normal operating temperatures, the Fail-Safe operates the same as any other thermostat. Stage 2: When overheating is caused by a deteriorating cooling system part, the Fail-Safe has a secondary stroke that activates a precision engineered piston that automatically locks the valve into a wide open position allowing coolant to circulate freely.

Don’t be stranded on the side of the road because your engine overheated and your conventional thermostat failed in the closed position keeping coolant from flowing to the engine. Buy the best Thermostat on the market, the Fail-Safe Thermostat from Motorad. Why is the Fail-Safe the best thermostat? Under normal operating temperatures, the Fail-Safe operates in the same manner as a conventional thermostat. However, when your vehicle overheats due to a deteriorating cooling system part, a standard thermostat locks in the closed position blocking the flow of coolant to the engine. Motorad’s patented Fail-Safe Thermostat is the only thermostat that automatically locks in the open position allowing coolant to circulate freely throughout the engine during the overheating process. This can protect your engine from a more costly repair.

Once the Fail-Safe thermostat does its job of allowing coolant to continue to flow to the engine during an overheating by locking in the open position, you must replace it with a new one. There are standard thermostats, then there is the Motorad Fail-Safe Thermostat. Ask for MotoRad’s Fail-Safe Thermostat the next time you need a new thermostat.

MotoRad®, established in 1958, is the leader in manufacturing top of the line thermostats, radiator caps and fuel caps offered to the North American automotive aftermarket. The company is also a trusted OE supplier and is a privately-owned subsidiary of Fishman Thermo Technologies. MotoRad proudly makes its sophisticated and advanced line of thermostats which is one of the finest in the automotive industry. MotoRad offers the most comprehensive coverage of thermostats for almost any vehicle and engine on the market. MotoRad is known by millions of customers worldwide as the company that offers everything for your thermostat and closure cap needs.

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Warranty Information

MotoRad of America warrants that all of its thermostats and caps are manufactured to be free from defects in material and workmanship. If any products sold by MotoRad of America are proven to be defective when sold, then MotoRad of America will replace such products or credit the distributor for the purchase price. Replacement/credit privileges apply only to products proven to be defective within the warranty period. The duration of the warranty period for MotoRad of America’s thermostats and caps is one year from the date of purchase.

The replacement/credit privileges does not apply to (i) accidents, alterations, negligence, misuse, wrong application or incorrect application which results in or contributes to product failure (ii) products installed on racing, off-road, marine or industrial motor vehicles. Except as specifically set forth above, no other warranty, express or implied, is applicable to the products. If warranty is requested, it must be requested within 30 days after the discovery of the damage and MotoRad of America’s Warranty Claim Form must accompany the request. The MotoRad of America produced part, with the original invoice from the retailer or installer from whom the product was purchased, must also accompany the Warranty Claim Form. MotoRad of America’s technical services department reserves the right to examine the engine or equipment to determine the amount of damage and/or weather the damage was the result of a defective MotoRad of America product.

Magnuson-Moss Warranty Act:
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More

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2001 Chevy Tracker
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2000 Chevy Tracker
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1989 Chevy Tracker
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1996 Ford Aerostar
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1995 Ford Aerostar
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1994 Ford Aerostar
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1993 Ford Aerostar
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1992 Ford Aerostar
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1991 Ford Aerostar
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1990 Ford Aerostar
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Ford Bronco
1990 Ford Bronco II
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1982 Ford Courier
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1981 Ford Courier
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1980 Ford Courier
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1979 Ford Courier
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2000 Ford Ranger
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1999 Ford Ranger
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1998 Ford Ranger
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1992 Ford Ranger
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1991 Ford Ranger
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1990 Ford Ranger
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1997 GEO Tracker
1996 GEO Tracker
1995 GEO Tracker
1994 GEO Tracker
1993 GEO Tracker
1992 GEO Tracker
1991 GEO Tracker
1990 GEO Tracker
1989 GEO Tracker
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1964 International M Series Van
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1968 International M1100
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1970 International Scout
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1995 Suzuki Samurai
1993 Suzuki Samurai
1992 Suzuki Samurai
1991 Suzuki Samurai
1990 Suzuki Samurai
Suzuki Sidekick
1998 Suzuki Sidekick
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1997 Suzuki Sidekick
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1996 Suzuki Sidekick
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1995 Suzuki Sidekick
1994 Suzuki Sidekick
1993 Suzuki Sidekick
1992 Suzuki Sidekick
1991 Suzuki Sidekick
1990 Suzuki Sidekick
Suzuki X-90
1998 Suzuki X-90
1997 Suzuki X-90
1996 Suzuki X-90
Toyota Celica
1971 Toyota Celica
Toyota Crown
1971 Toyota Crown
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Toyota Mark II
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Low Prices Price match guarantee
In-House Experts We know our products
Guaranteed Fitment Always the correct part
Easy Returns Quick & Hassle Free

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