Gates 33429S Engine Coolant Thermostat

Gates Premium Thermostat 33429S Overview

The Gates Premium Thermostat 33429S is a 195-degree engine coolant thermostat built for stable temperature control in a wide range of GM, Suzuki, Geo, and Isuzu applications. It uses stainless steel and copper construction to improve corrosion resistance and maintain consistent operation under normal driving conditions.

Compatible With Buick LeSabre, Park Avenue, Regal, Century, Riviera, Skylark, Reatta, LaCrosse, Allure, and Lucerne applications, as well as Chevrolet Impala, Monte Carlo, S10, Camaro, Astro, Blazer, and more. The Gates 33429S is a direct-fit cooling system service part for drivers replacing a worn thermostat on high-mileage vehicles.

Key Features

• 195-degree start-to-open temperature for OE-style engine warm-up control
• Heavy-gauge stainless steel and copper construction for improved corrosion resistance
• Reverse poppet design for proper coolant flow regulation
• Upgraded spring for more stable temperature control during normal operation
• Sealing flange outside diameter: 1.72 in.
• Height between flanges: 0.82 in.; overall height: 1.68 in.
• No jiggle pin weep hole, no gasket, and no installation tool included

Product Details

Gates Premium Thermostat line focuses on durable thermostat construction and consistent opening behavior for everyday cooling system service. Part number 33429S is engineered to help maintain the engine’s operating temperature in vehicles that rely on a 195-degree thermostat, including Buick Park Avenue and Chevrolet Impala applications. This thermostat cross-references Four Seasons 65849 for the same application.

Use this thermostat when replacing a temperature control component in the cooling system and you need a premium-style service part that matches OE temperature requirements. The reverse poppet design and upgraded spring support steady coolant regulation across a broad range of fitments from 1980s through 2009 model years.

Common Problems It Can Address

• Engine running cooler or hotter than expected
• Delayed warm-up after cold starts
• Temperature fluctuation during normal driving
• Cooling system service on a worn or sticking thermostat
• Restoring OE temperature control after thermostat replacement

Installation Notes

Verify the thermostat housing style, flange dimensions, and 195-degree temperature requirement before installation. Clean the sealing surfaces thoroughly and inspect the housing, coolant condition, and related hoses while servicing the cooling system. Because no gasket is listed with this part, confirm the correct sealing method for the application before assembly.

Fits 2005-2009 Buick LaCrosse, N/A; 2005-2008 Buick Allure, N/A; 2006-2008 Buick Lucerne, N/A; 1996-2008 Pontiac Grand Prix, N/A; 1986-2005 Buick LeSabre, N/A; 1991-2005 Buick Park Avenue, N/A; 2000-2005 Chevrolet Impala, N/A; 1996-2005 Chevrolet Monte Carlo, N/A; 1980-1981 Chevrolet Monte Carlo, N/A; 1987-2005 Pontiac Bonneville, N/A; 1990-2004 Buick Regal, N/A; 1990-2003 Chevrolet S10, N/A; 1991-2003 GMC Sonoma, N/A; 1989-2002 Chevrolet Camaro, N/A; 1989-2002 Pontiac Firebird, N/A; 1998-2001 Chevrolet Metro, N/A; 1992 Chevrolet Metro, N/A; 1989-2001 Suzuki Swift, N/A; 1996-2000 Isuzu Hombre, N/A; 1994-2000 Pontiac Firefly, N/A; 1985-1986 Pontiac Firefly, N/A; 1995-2000 Suzuki Esteem, N/A; 1995-1999 Buick Riviera, N/A; 1986-1993 Buick Riviera, N/A; 1996-1999 Chevrolet Lumina, N/A; 1993 Chevrolet Lumina, N/A; 1992-1999 Oldsmobile 88, N/A; 1998-1999 Oldsmobile Intrigue, N/A; 1996-1999 Oldsmobile LSS, N/A; 1997-1998 Oldsmobile Regency, N/A; 1994-1997 Geo Metro, N/A; 1992 Geo Metro, N/A; 1991-1997 GMC P3500, N/A; 1986-1996 Buick Century, N/A; 1991-1996 Chevrolet G30, N/A; 1995-1996 Geo Metro, N/A; 1989-1993 Geo Metro, N/A; 1991-1996 GMC G3500, N/A; 1986-1996 Oldsmobile 98, N/A; 1996 Oldsmobile Cutlass Ciera, N/A; 1986-1993 Oldsmobile Cutlass Ciera, N/A; 1996 Oldsmobile Cutlass Supreme, N/A; 1995-1996 Pontiac Firefly, N/A; 1987-1991 Pontiac Firefly, N/A; 1992-1995 Chevrolet Astro, N/A; 1995 Chevrolet Blazer, N/A; 1992-1995 Chevrolet C2500, N/A; 1992-1995 Chevrolet C2500 Suburban, N/A; 1992-1995 Chevrolet C3500, N/A; 1992-1995 Chevrolet Cavalier, N/A; 1992-1995 Chevrolet Corsica, N/A; 1992-1995 Chevrolet K2500, N/A; 1992-1995 Chevrolet K2500 Suburban, N/A; 1992-1995 Chevrolet K3500, N/A; 1992-1995 Chevrolet Lumina APV, N/A; 1995 Chevrolet Lumina Van, N/A; 1991-1995 Chevrolet P30, N/A; 1991-1995 GMC C2500, N/A; 1992-1995 GMC C2500 Suburban, N/A; 1991-1995 GMC C3500, N/A; 1992-1995 GMC Jimmy, N/A; 1991-1995 GMC K2500, N/A; 1992-1995 GMC K2500 Suburban, N/A; 1991-1995 GMC K3500, N/A; 1992-1995 GMC Safari, N/A; 1992-1995 Oldsmobile Silhouette, N/A; 1995 Pontiac Sunfire, N/A; 1992-1995 Pontiac Trans Sport, N/A; 1992-1994 Chevrolet S10 Blazer, N/A; 1991-1994 Isuzu Pickup, N/A; 1992-1994 Oldsmobile Bravada, N/A; 1986-1993 Buick Skylark, N/A; 1992-1993 Chevrolet C1500, N/A; 1992-1993 Oldsmobile Achieva, N/A; 1987-1993 Oldsmobile Cutlass Cruiser, N/A; 1992-1993 Pontiac Grand Am, N/A; 1985-1987 Pontiac Grand Am, N/A; 1987-1992 Chevrolet Sprint, N/A; 1991-1992 Isuzu Rodeo, N/A; 1986-1992 Oldsmobile Toronado, N/A; 1992 Suzuki Swift, N/A; 1988-1991 Buick Reatta, N/A; 1991 Chevrolet C1500, N/A; 1991 Chevrolet C2500, N/A; 1991 Chevrolet C3500, N/A; 1991 Chevrolet K2500, N/A; 1991 Chevrolet K3500, N/A; 1991 Chevrolet R2500 Suburban, N/A; 1991 Chevrolet R3500, N/A; 1991 Chevrolet V3500, N/A; 1991 GMC R2500 Suburban, N/A; 1991 GMC R3500, N/A; 1991 GMC V3500, N/A; 1990-1991 Isuzu Trooper, N/A; 1988-1991 Oldsmobile Cutlass Calais, N/A; 1986-1991 Oldsmobile Delta 88, N/A; 1990 GMC S15, N/A; 1989 Pontiac Firebird, N/A; 1986-1987 Buick Regal, N/A; 1985-1987 Oldsmobile Calais, N/A; 1985-1986 Chevrolet Sprint, N/A.

Quality Assurance

Gates specifies heavy-gauge stainless steel construction and an upgraded spring for improved corrosion resistance and temperature stability. Part number 33429S is built as a premium thermostat service replacement for OE-temperature applications.