Gates 33428S Engine Coolant Thermostat

Gates 33428S Premium Thermostat Overview

The Gates 33428S Premium Thermostat is an 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, with an upgraded spring for more consistent opening performance under normal operating conditions.

Compatible With Buick LeSabre, Park Avenue, Regal, Century, Riviera, Skylark, Reatta, LaCrosse, Allure, Lucerne, and more, this 180-degree thermostat supports dependable coolant flow control across many passenger cars, vans, and trucks. The Gates 33428S is a direct-fit cooling system service part for vehicles that call for a reverse poppet thermostat design.

Key Features

• Premium thermostat design for engine coolant temperature regulation
• Heavy-gauge stainless steel and copper construction for corrosion resistance
• Upgraded spring for improved temperature stability during normal operation
• Reverse poppet design
• 180-degree start-to-open temperature
• No gasket, seal, or installation tool included
• Jiggle pin weep hole: No

Product Details

Gates Premium Thermostat line focuses on durable cooling-system service parts with materials selected for long-term reliability. Part number 33428S is engineered with a stainless steel and copper body, a 1.73-inch sealing flange outside diameter, and a 1.67-inch overall height. The reverse poppet configuration and 180-degree opening point make it a fitment-specific replacement for many older GM platforms, including Chevrolet Impala, Monte Carlo, Camaro, S10, and Pontiac Grand Prix applications, along with Buick and Oldsmobile models that specify this thermostat style.

This part cross-references Four Seasons 65848 and Stant 45848 for the same application.

Common Problems This Part Can Address

• Engine running hotter than normal due to a worn thermostat
• Delayed coolant circulation after warm-up
• Temperature fluctuation from weak thermostat spring tension
• Corrosion-related thermostat housing wear
• Cooling system service on vehicles requiring a 180-degree thermostat

Installation Notes and Tips

Verify the thermostat style, opening temperature, and flange dimensions before installation. Clean the housing mating surfaces thoroughly and inspect the coolant system for contamination, damaged hoses, or a compromised radiator cap before reassembly. Because this thermostat does not include a gasket or seals, use the correct sealing components specified for the vehicle application.

Fits 2005-2009 Buick LaCrosse, N/A; Fits 2005-2008 Buick Allure, N/A; Fits 2006-2008 Buick Lucerne, N/A; Fits 1996-2007 Pontiac Grand Prix, N/A; Fits 1986-2005 Buick LeSabre, N/A; Fits 1991-2005 Buick Park Avenue, N/A; Fits 2000-2005 Chevrolet Impala, N/A; Fits 1996-2005 Chevrolet Monte Carlo, N/A; Fits 1980-1981 Chevrolet Monte Carlo, N/A; Fits 1987-2005 Pontiac Bonneville, N/A; Fits 1990-2004 Buick Regal, N/A; Fits 1990-2003 Chevrolet S10, N/A; Fits 1991-2003 GMC Sonoma, N/A; Fits 1989-2002 Chevrolet Camaro, N/A; Fits 1989-2002 Pontiac Firebird, N/A; Fits 1998-2001 Chevrolet Metro, N/A; Fits 1989-2001 Suzuki Swift, N/A; Fits 1996-2000 Isuzu Hombre, N/A; Fits 1994-2000 Pontiac Firefly, N/A; Fits 1995-2000 Suzuki Esteem, N/A; Fits 1995-1999 Buick Riviera, N/A; Fits 1996-1999 Chevrolet Lumina, N/A; Fits 1992-1999 Oldsmobile 88, N/A; Fits 1998-1999 Oldsmobile Intrigue, N/A; Fits 1996-1999 Oldsmobile LSS, N/A; Fits 1997-1998 Oldsmobile Regency, N/A; Fits 1994-1997 Geo Metro, N/A; Fits 1991-1997 GMC P3500, N/A; Fits 1986-1996 Buick Century, N/A; Fits 1991-1996 Chevrolet G30, N/A; Fits 1995-1996 Geo Metro, N/A; Fits 1989-1993 Geo Metro, N/A; Fits 1991-1996 GMC G3500, N/A; Fits 1986-1996 Oldsmobile 98, N/A; Fits 1996 Oldsmobile Cutlass Ciera, N/A; Fits 1986-1993 Oldsmobile Cutlass Ciera, N/A; Fits 1996 Oldsmobile Cutlass Supreme, N/A; Fits 1995-1996 Pontiac Firefly, N/A; Fits 1987-1991 Pontiac Firefly, N/A; Fits 1992-1995 Chevrolet Astro, N/A; Fits 1995 Chevrolet Blazer, N/A; Fits 1992-1995 Chevrolet C2500, N/A; Fits 1992-1995 Chevrolet C2500 Suburban, N/A; Fits 1992-1995 Chevrolet C3500, N/A; Fits 1992-1995 Chevrolet Cavalier, N/A; Fits 1992-1995 Chevrolet Corsica, N/A; Fits 1992-1995 Chevrolet K2500, N/A; Fits 1992-1995 Chevrolet K2500 Suburban, N/A; Fits 1992-1995 Chevrolet K3500, N/A; Fits 1992-1995 Chevrolet Lumina APV, N/A; Fits 1995 Chevrolet Lumina Van, N/A; Fits 1991-1995 Chevrolet P30, N/A; Fits 1991-1995 GMC C2500, N/A; Fits 1992-1995 GMC C2500 Suburban, N/A; Fits 1991-1995 GMC C3500, N/A; Fits 1992-1995 GMC Jimmy, N/A; Fits 1991-1995 GMC K2500, N/A; Fits 1992-1995 GMC K2500 Suburban, N/A; Fits 1991-1995 GMC K3500, N/A; Fits 1992-1995 GMC Safari, N/A; Fits 1992-1995 Oldsmobile Silhouette, N/A; Fits 1995 Pontiac Sunfire, N/A; Fits 1992-1995 Pontiac Trans Sport, N/A; Fits 1992-1994 Chevrolet S10 Blazer, N/A; Fits 1991-1994 Isuzu Pickup, N/A; Fits 1992-1994 Oldsmobile Bravada, N/A; Fits 1986-1993 Buick Skylark, N/A; Fits 1992-1993 Chevrolet C1500, N/A; Fits 1992-1993 Oldsmobile Achieva, N/A; Fits 1987-1993 Oldsmobile Cutlass Cruiser, N/A; Fits 1992-1993 Pontiac Grand Am, N/A; Fits 1985-1987 Pontiac Grand Am, N/A; Fits 1987-1992 Chevrolet Sprint, N/A; Fits 1991-1992 Isuzu Rodeo, N/A; Fits 1986-1992 Oldsmobile Toronado, N/A; Fits 1992 Suzuki Swift, N/A; Fits 1988-1991 Buick Reatta, N/A; Fits 1991 Chevrolet C1500, N/A; Fits 1991 Chevrolet C2500, N/A; Fits 1991 Chevrolet C3500, N/A; Fits 1991 Chevrolet K2500, N/A; Fits 1991 Chevrolet K3500, N/A; Fits 1991 Chevrolet R2500 Suburban, N/A; Fits 1991 Chevrolet R3500, N/A; Fits 1991 Chevrolet V3500, N/A; Fits 1991 GMC R2500 Suburban, N/A; Fits 1991 GMC R3500, N/A; Fits 1991 GMC V3500, N/A; Fits 1990-1991 Isuzu Trooper, N/A; Fits 1988-1991 Oldsmobile Cutlass Calais, N/A; Fits 1986-1991 Oldsmobile Delta 88, N/A; Fits 1990 GMC S15, N/A; Fits 1989 Pontiac Firebird, N/A; Fits 1986-1987 Buick Regal, N/A; Fits 1985-1987 Oldsmobile Calais, N/A; Fits 1985-1986 Chevrolet Sprint, N/A.

Quality Assurance

Gates Premium Thermostats are built with corrosion-resistant materials and an upgraded spring to support stable coolant control in normal operation. Part number 33428S is a fitment-specific replacement for vehicles that require this thermostat design and opening temperature.