Heavy-duty trucks, buses and equipment subject the thermostat to constant vibration and long run times. This Gates heavy-duty thermostat is built from heavy-gauge brass and stainless steel with a temperature-sensitive heat motor for consistent valve response.

Gates 33959 Heavy-Duty Thermostat Features:

• 180 Degree F Opening Temperature
• Heavy-Gauge Brass and Stainless Steel Construction
• Factory Calibrated for Accurate Opening and Closing
• Temperature-Sensitive Heat Motor for Consistent Valve Response
• Application Options Apply on Some Vehicles, Check the Fitment Tab Before Ordering
• Sold Individually

Vehicle Applications:

• 1999-2004 American LaFrance ALF Eagle 8.3L L6, 8.9L L6
• 2000-2004 American LaFrance Metropolitan 8.3L L6
• 2003-2010 Autocar LLC. Xpeditor WX 8.3L L6, 8.9L L6
• 2003-2010 Autocar LLC. Xpeditor WXLL 8.3L L6, 8.9L L6
• 2003-2006 Autocar LLC. Xpeditor WXR 8.3L L6, 8.9L L6
• 2010-2012 Autocar LLC. Xpeditor 8.3L L6
• 1992-2003 Blue Bird All American FE 8.3L L6
• 1992-2007 Blue Bird All American RE 8.3L L6
• 1996 Blue Bird TC2000 8.3L L6
• 2004-2009 Crane Carrier Low Entry 8.3L L6
• 1997-2003 El Dorado E-Z Rider 8.3L L6
• 2002-2006 El Dorado Escort RE 8.3L L6
• 1993-1997 Ford CF8000 8.3L L6
• 1993-1997 Ford CFT8000 8.3L L6
• 1993-1997 Ford F-800 8.3L L6
• 1993-1998 Ford FT900 8.3L L6
• 1993-1997 Ford L8000F 8.3L L6
• 1993-1997 Ford LA8000F 8.3L L6
• 1993-1997 Ford LN8000 8.3L L6
• 1993-1997 Ford LNT8000F 8.3L L6
• 1993-1997 Ford LS8000F 8.3L L6
• 1993-1997 Ford LT8000F 8.3L L6
• 1993-1997 Ford LTS8000F 8.3L L6
• 1996-1998 Ford L8513 8.3L L6
• 1996-1998 Ford LT8513 8.3L L6
• 1997-1998 Ford L8501 8.3L L6
• 1997-1998 Ford LT8501 8.3L L6
• 1998 Ford L8511 8.3L L6
• 1998 Ford LT8511 8.3L L6
• 1989-1995 Freightliner FLC112 8.3L L6
• 1990-2001 Freightliner FLD120 8.3L L6
• 1991-2002 Freightliner FLD112 8.3L L6
• 1992-2004 Freightliner FL60 8.3L L6
• 1992-2005 Freightliner FL70 8.3L L6
• 1992-2005 Freightliner FL80 8.3L L6
• 1995-2002 Freightliner FL50 8.3L L6
• 1999-2000 Freightliner XB Line 8.3L L6
• 2001-2006 Freightliner Condor 8.3L L6, 8.9L L6
• 2002-2005 Freightliner XC 8.3L L6, 8.9L L6
• 2005-2007 Freightliner M2 106 8.3L L6
• 2005 Freightliner XC Formed Rail 8.9L L6
• 2005 Freightliner XC Raised Rail 8.9L L6
• 1999-2005 Gillig Low Floor 8.3L L6
• 1987-1993 Kenworth K130 8.3L L6
• 1988-1989 Kenworth 13-210 8.3L L6
• 1988-1992 Kenworth K220 8.3L L6
• 1989 Kenworth 22-210 8.3L L6
• 1990-1993 Kenworth K150 8.3L L6
• 1990-1991 Kenworth T400 8.3L L6
• 1993-1999 Kenworth K300 8.3L L6
• 1995-2007 Kenworth T300 8.3L L6
• 1995-2005 Kenworth W900 8.3L L6
• 1997-2001 Kenworth T800 8.3L L6
• 1989-1991 Mack CM 8.3L L6
• 1996-2001 Mack LE 8.3L L6
• 2019 Mack MRU 8.9L L6
• 2019 Mack TerraPro 8.9L L6
• 2021 Mack LR 8.9L L6
• 2003 Nova Bus Corporation Low Floor 40 8.3L L6
• 1987-1994 Peterbilt 224 8.3L L6
• 1988-1994 Peterbilt 265 8.3L L6
• 1988-2007 Peterbilt 320 8.3L L6
• 1988-1990 Peterbilt 376 8.3L L6
• 1990-1994 Peterbilt 227 8.3L L6
• 1991-2007 Peterbilt 357 8.3L L6, 8.9L L6
• 1992-1996 Peterbilt 375 8.3L L6
• 1993-2000 Peterbilt 200 8.3L L6
• 1995-2007 Peterbilt 330 8.3L L6
• 1996 Peterbilt 378 8.3L L6
• 1996-1997 Peterbilt 385 8.3L L6
• 1997 Peterbilt 379 8.3L L6
• 2005-2007 Peterbilt 335 8.3L L6
• 2007-2008 Peterbilt 340 8.3L L6
• 2009-2011 Spartan Motors Furion 8.3L L6
• 2009-2012 Spartan Motors Metro Star 8.3L L6
• 2012 Spartan Motors Force 8.3L L6
• 1999-2007 Sterling Truck L7500 8.3L L6
• 1999-2000 Sterling Truck L7501 8.3L L6
• 1999-2007 Sterling Truck L8500 8.3L L6, 8.9L L6
• 1999 Sterling Truck L8501 8.3L L6
• 1999-2000 Sterling Truck L8511 8.3L L6
• 1999-2000 Sterling Truck L8513 8.3L L6
• 1999-2007 Sterling Truck LT7500 8.3L L6
• 1999-2000 Sterling Truck LT7501 8.3L L6
• 1999-2007 Sterling Truck LT8500 8.3L L6, 8.9L L6
• 1999 Sterling Truck LT8501 8.3L L6
• 1999-2000 Sterling Truck LT8511 8.3L L6
• 1999-2000 Sterling Truck LT8513 8.3L L6
• 2000-2003 Sterling Truck LT9500 8.3L L6, 8.9L L6
• 2001-2007 Sterling Truck Acterra 5500 8.3L L6
• 2001-2007 Sterling Truck Acterra 6500 8.3L L6
• 2001-2007 Sterling Truck Acterra 7500 8.3L L6
• 2001-2003 Sterling Truck Acterra 8500 8.3L L6
• 2002-2007 Sterling Truck Condor 8.3L L6, 8.9L L6
• 2003-2007 Sterling Truck Acterra 8.3L L6
• 2007 Sterling Truck SC8000 Cargo 5.9L L6
• 2003-2007 Thomas Saf-T-Liner 8.3L L6
• 2005-2007 Thomas Transit Liner 8.3L L6
• 2006 Thomas School Bus 8.3L L6
• 1996-1997 Volvo WX 8.3L L6
• 1998 Volvo WAH 8.3L L6
• 2004 Volvo VHD 8.9L L6
• 1990 Western Star 3800 8.3L L6
• 2012 Western Star 4700SB 8.3L L6
• 1991-1995 White/GMC WXLL 8.3L L6
• 1991-1993 White/GMC WXLM 8.3L L6
• 1992-1995 White/GMC WX 8.3L L6
• 1994-1995 White/GMC WXR 8.3L L6
• 2006-2007 Workhorse R32 8.3L L6
• 2006-2007 Workhorse Custom Chassis R20 8.3L L6