# MotoRad 7339-180 Fail Safe™ Series Thermostat with Seal for 1993-2011 Buick Lucerne ### Specifications Bypass Diameter: 1.38" Bypass Length: 1.58" Flange Thickness: 0.05" Gasket/Seal Material: Rubber Installation Tool Included: No Jiggle Pin Weep Hole: Yes Number Of Seals: 1 Sealing Flange Outside Diameter: 2.11" Temperature (Degree): 180F ### Features - 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 ### Product Details Fail Safe™ Series Thermostat with Seal (7339-180) by MotoRad®. Temperature: 180F. 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. 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. Brand: MotoRad Part Number: 7339-180 UPC: 055644733982 Alternate MPN: 7339180 ### Vehicle Fitment Table Year Make Model Position Fitment Precision Note 2006 Buick Lucerne 2007 Buick Lucerne 2008 Buick Lucerne 2009 Buick Lucerne 2010 Buick Lucerne 2011 Buick Lucerne 1993 Cadillac Allante 1994 Cadillac Deville 1995 Cadillac Deville 1996 Cadillac Deville 1997 Cadillac Deville 1998 Cadillac Deville 1999 Cadillac Deville 2000 Cadillac Deville 2001 Cadillac Deville 2002 Cadillac Deville 2003 Cadillac Deville 2004 Cadillac Deville 2005 Cadillac Deville 2006 Cadillac DTS 2007 Cadillac DTS 2008 Cadillac DTS 2009 Cadillac DTS 2010 Cadillac DTS 2011 Cadillac DTS 1993 Cadillac Eldorado 1994 Cadillac Eldorado 1995 Cadillac Eldorado 1996 Cadillac Eldorado 1997 Cadillac Eldorado 1998 Cadillac Eldorado 1999 Cadillac Eldorado 2000 Cadillac Eldorado 2001 Cadillac Eldorado 2002 Cadillac Eldorado 1993 Cadillac Seville 1994 Cadillac Seville 1995 Cadillac Seville 1996 Cadillac Seville 1997 Cadillac Seville 1998 Cadillac Seville 1999 Cadillac Seville 2000 Cadillac Seville 2001 Cadillac Seville 2002 Cadillac Seville 2003 Cadillac Seville 2004 Cadillac Seville 2004 Cadillac SRX 2005 Cadillac SRX 2006 Cadillac SRX 2007 Cadillac SRX 2008 Cadillac SRX 2009 Cadillac SRX 2005 Cadillac STS 2006 Cadillac STS 2007 Cadillac STS 2008 Cadillac STS 2009 Cadillac STS 2010 Cadillac STS 2004 Cadillac XLR 2005 Cadillac XLR 2006 Cadillac XLR 2007 Cadillac XLR 2008 Cadillac XLR 2009 Cadillac XLR 1995 Oldsmobile Aurora 1996 Oldsmobile Aurora 1997 Oldsmobile Aurora 1998 Oldsmobile Aurora 1999 Oldsmobile Aurora 2001 Oldsmobile Aurora 2002 Oldsmobile Aurora 2003 Oldsmobile Aurora 2004 Pontiac Bonneville 2005 Pontiac Bonneville ### FAQ **Will this fit my vehicle?** Please verify your year, make, model, position, and any fitment notes using the Vehicle Fitment Table above before purchase. **What part number is this?** The listed part number is 7339-180. **Is this product designed for direct replacement?** Yes. This product is intended to match the compatible vehicle applications listed in the fitment table. **Should I confirm fitment before ordering?** Yes. Always compare your original part, position, and vehicle details with the fitment table before ordering. ### Common Searches - Fail Safe™ Series Thermostat with Seal for Buick Lucerne - 7339-180 fitment - MotoRad Fail Safe™ Series Thermostat with Seal - 2006 Buick Lucerne Fail Safe™ Series Thermostat with Seal ## Details - **Price:** 36.5 CAD - **Vendor:** MotoRad - **Type:** Fail Safe™ Series Thermostat with Seal - **Tags:** 1993 Cadillac Allante, 1993-2002 Cadillac Eldorado, 1993-2004 Cadillac Seville, 1994-2005 Cadillac Deville, 1995-1999, 2001-2003 Oldsmobile Aurora, 2004-2005 Pontiac Bonneville, 2004-2009 Cadillac SRX, 2004-2009 Cadillac XLR, 2005-2010 Cadillac STS, 2006-2011 Buick Lucerne, 2006-2011 Cadillac DTS, 7339-180, Automotive, Fail Safe™ Series Thermostat with Seal, MotoRad ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 36.50 CAD | In stock | ## Images - MotoRad 7339-180 Fail Safe™ Series Thermostat with Seal for 1993-2011 Buick Lucerne --- > Source: [Standard Auto Part](https://www.standardautopart.com/products/motorad-7339-180-fail-safetm-series-thermostat-with-seal) > Updated: 2026-08-18