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Calorstat TH1538.91 Engine Coolant ThermostatOE Quality 60-Day Returns
Part #: TH1538.91

Calorstat TH1538.91 Engine Coolant Thermostat

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Fitment: Cadillac, Chevrolet, Ford, GMC, Isuzu, Lincoln, Oldsmobile, and Volkswagen, Astro, Blazer, Bravada, C1500, C1500 Suburban, Escalade, Express 1500, Express 2500, G30, Hombre, Jetta, Jimmy, K1500, K1500 Suburban, S10, Safari, Savana 1500, Savana 2500, Sierra 1500, Sierra 1500 Classic, Silverado, Silverado 1500, Silverado 1500 Classic, Silverado 3500, Sonoma, Tahoe, Thunderbird, Town Car, and Yukon
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Engine Coolant Thermostat for OE-Style Temperature Control

Calorstat TH1538.91 is a standard engine coolant thermostat built to regulate coolant flow at a 196°F opening temperature. It is a direct-fit cooling system service part for a wide range of Chevrolet, GMC, Ford, Lincoln, Cadillac, Isuzu, Oldsmobile, and Volkswagen applications.

  • Standard engine coolant thermostat for routine cooling system service
  • Start-to-open temperature: 196°F / 91°C
  • Sealing flange outside diameter: 2.1
  • Height between flanges: 1.38
  • Cross-references Bosch 13399 for the same application
  • Part number: TH1538.91

Fitment and Application Details

This thermostat is used in vehicles that require stable coolant temperature control for proper engine warm-up and operating temperature management. Fits 2007-2014 Chevrolet Express 1500, N/A; Fits 1996-2002 Chevrolet Express 1500, N/A; Fits 2007-2014 GMC Savana 1500, N/A; Fits 1996-2002 GMC Savana 1500, N/A; Fits 2007-2013 Chevrolet Silverado 1500, N/A; Fits 2007-2013 GMC Sierra 1500, N/A; Fits 2007 Chevrolet Silverado 1500 Classic, N/A; Fits 2007 Chevrolet Silverado 3500, N/A; Fits 2007 GMC Sierra 1500 Classic, N/A; Fits 2005-2006 Volkswagen Jetta, N/A; Fits 1996-2005 Chevrolet Astro, N/A; Fits 1996-2005 Chevrolet Blazer, N/A; Fits 1996-2005 GMC Jimmy, N/A; Fits 1996-2005 GMC Safari, N/A; Fits 1996-2004 Chevrolet S10, N/A; Fits 1996-2004 GMC Sonoma, N/A; Fits 1996-2002 Chevrolet Express 2500, N/A; Fits 2001-2002 Chevrolet G30, N/A; Fits 1996-2002 GMC Savana 2500, N/A; Fits 1995-2002 Lincoln Town Car, N/A; Fits 1996-2001 Oldsmobile Bravada, N/A; Fits 1999-2000 Cadillac Escalade, N/A; Fits 1997-2000 Isuzu Hombre, N/A; Fits 1996-1999 Chevrolet C1500, N/A; Fits 1996-1999 Chevrolet C1500 Suburban, N/A; Fits 1996-1999 Chevrolet K1500, N/A; Fits 1996-1999 Chevrolet K1500 Suburban, N/A; Fits 1996-1999 Chevrolet Silverado, N/A; Fits 1996-1999 Chevrolet Tahoe, N/A; Fits 1996-1999 GMC C1500, N/A; Fits 1996-1999 GMC C1500 Suburban, N/A; Fits 1996-1999 GMC K1500, N/A; Fits 1996-1999 GMC K1500 Suburban, N/A; Fits 1996-1999 GMC Yukon, N/A; Fits 1995-1997 Ford Thunderbird, N/A.

What This Thermostat Helps Address

  • Engine running too cool or taking too long to reach operating temperature
  • Temperature fluctuations caused by a worn thermostat
  • Cooling system service on Chevrolet Silverado 1500 and GMC Sierra 1500 trucks
  • Replacement needs on Chevrolet Express, GMC Savana, and related GM platforms
  • Temperature control concerns in 196°F / 91°C applications

Installation Notes and Tips

Verify the thermostat housing style, sealing flange dimensions, and opening temperature before installation. For best results, inspect the housing, gasket sealing surfaces, and coolant condition during service, and confirm the replacement matches the vehicle’s original 196°F specification. Part number TH1538.91 is commonly searched for Chevrolet Silverado 1500, GMC Sierra 1500, and Chevrolet Express cooling system repairs.

Quality Assurance

Calorstat supplies cooling system components engineered for temperature control consistency and OE-style fitment. This thermostat is specified as a standard design with defined dimensional and temperature characteristics for accurate replacement selection.

BrandCalorstat
Part NumberTH1538.91
Sealing Flange Outside Diameter2.1
Height Between Flanges1.38
TypeStandard
Start to Open Temperature196.0
98131.14
98441

This part fits 190 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2014ChevroletExpress 15005.3LV8N/AOpening Temp: 91 C / 196 F
2014GMCSavana 15005.3LV8N/AOpening Temp: 91 C / 196 F
2013ChevroletExpress 15005.3LV8N/AOpening Temp: 91 C / 196 F
2013ChevroletSilverado 15006.2LV8N/AOpening Temp: 91 C / 196 F
2013GMCSavana 15005.3LV8N/AOpening Temp: 91 C / 196 F
2013GMCSierra 15006.2LV8N/AOpening Temp: 91 C / 196 F
2012ChevroletExpress 15005.3LV8N/AOpening Temp: 91 C / 196 F
2012ChevroletSilverado 15006.2LV8N/AOpening Temp: 91 C / 196 F
2012GMCSavana 15005.3LV8N/AOpening Temp: 91 C / 196 F
2012GMCSierra 15006.2LV8N/AOpening Temp: 91 C / 196 F
2011ChevroletExpress 15005.3LV8N/AOpening Temp: 91 C / 196 F
2011ChevroletSilverado 15006.2LV8N/AOpening Temp: 91 C / 196 F
2011GMCSavana 15005.3LV8N/AOpening Temp: 91 C / 196 F
2011GMCSierra 15006.2LV8N/AOpening Temp: 91 C / 196 F
2010ChevroletExpress 15005.3LV8N/AOpening Temp: 91 C / 196 F
2010ChevroletSilverado 15006.2LV8N/AOpening Temp: 91 C / 196 F
2010GMCSavana 15005.3LV8N/AOpening Temp: 91 C / 196 F
2010GMCSierra 15006.2LV8N/AOpening Temp: 91 C / 196 F
2009ChevroletExpress 15005.3LV8N/AOpening Temp: 91 C / 196 F
2009ChevroletSilverado 15006.2LV8N/AOpening Temp: 91 C / 196 F
2009GMCSavana 15005.3LV8N/AOpening Temp: 91 C / 196 F
2009GMCSierra 15006.2LV8N/AOpening Temp: 91 C / 196 F
2008ChevroletExpress 15005.3LV8N/AOpening Temp: 91 C / 196 F
2008ChevroletSilverado 15006.0LV8N/AOpening Temp: 91 C / 196 F
2008GMCSavana 15005.3LV8N/AOpening Temp: 91 C / 196 F
2008GMCSierra 15006.2LV8N/AOpening Temp: 91 C / 196 F
2007ChevroletExpress 15005.3LV8N/AOpening Temp: 91 C / 196 F
2007ChevroletSilverado 15006.0LV8N/AOpening Temp: 91 C / 196 F
2007ChevroletSilverado 1500 Classic6.0LV8N/AOpening Temp: 91 C / 196 F
2007ChevroletSilverado 35005.7LV8N/AOpening Temp: 91 C / 196 F
2007GMCSavana 15005.3LV8N/AOpening Temp: 91 C / 196 F
2007GMCSierra 15006.2LV8N/AOpening Temp: 91 C / 196 F
2007GMCSierra 1500 Classic6.0LV8N/AOpening Temp: 91 C / 196 F
2006VolkswagenJetta2.5LL5N/AOpening Temp: 91 C / 196 F
2005ChevroletAstro4.3LV6N/AOpening Temp: 91 C / 196 F
2005ChevroletBlazer4.3LV6N/AOpening Temp: 91 C / 196 F
2005GMCJimmy4.3LV6N/AOpening Temp: 91 C / 196 F
2005GMCSafari4.3LV6N/AOpening Temp: 91 C / 196 F
2005VolkswagenJetta2.5LL5N/AOpening Temp: 91 C / 196 F
2004ChevroletAstro4.3LV6N/AOpening Temp: 91 C / 196 F
2004ChevroletBlazer4.3LV6N/AOpening Temp: 91 C / 196 F
2004ChevroletS104.3LV6N/AOpening Temp: 91 C / 196 F
2004GMCJimmy4.3LV6N/AOpening Temp: 91 C / 196 F
2004GMCSafari4.3LV6N/AOpening Temp: 91 C / 196 F
2004GMCSonoma4.3LV6N/AOpening Temp: 91 C / 196 F
2003ChevroletAstro4.3LV6N/AOpening Temp: 91 C / 196 F
2003ChevroletBlazer4.3LV6N/AOpening Temp: 91 C / 196 F
2003ChevroletS104.3LV6N/AOpening Temp: 91 C / 196 F
2003GMCJimmy4.3LV6N/AOpening Temp: 91 C / 196 F
2003GMCSafari4.3LV6N/AOpening Temp: 91 C / 196 F
2003GMCSonoma4.3LV6N/AOpening Temp: 91 C / 196 F
2002ChevroletAstro4.3LV6N/AOpening Temp: 91 C / 196 F
2002ChevroletBlazer4.3LV6N/AOpening Temp: 91 C / 196 F
2002ChevroletExpress 15005.7LV8N/AOpening Temp: 91 C / 196 F
2002ChevroletExpress 25006.5LV8N/AOpening Temp: 91 C / 196 F
2002ChevroletG304.3LV6N/AOpening Temp: 91 C / 196 F
2002ChevroletS104.3LV6N/AOpening Temp: 91 C / 196 F
2002GMCJimmy4.3LV6N/AOpening Temp: 91 C / 196 F
2002GMCSafari4.3LV6N/AOpening Temp: 91 C / 196 F
2002GMCSavana 15005.7LV8N/AOpening Temp: 91 C / 196 F
2002GMCSavana 25006.5LV8N/AOpening Temp: 91 C / 196 F
2002GMCSonoma4.3LV6N/AOpening Temp: 91 C / 196 F
2002LincolnTown Car4.6LV8N/AOpening Temp: 91 C / 196 F
2001ChevroletAstro4.3LV6N/AOpening Temp: 91 C / 196 F
2001ChevroletBlazer4.3LV6N/AOpening Temp: 91 C / 196 F
2001ChevroletExpress 15005.7LV8N/AOpening Temp: 91 C / 196 F
2001ChevroletExpress 25006.5LV8N/AOpening Temp: 91 C / 196 F
2001ChevroletG304.3LV6N/AOpening Temp: 91 C / 196 F
2001ChevroletS104.3LV6N/AOpening Temp: 91 C / 196 F
2001GMCJimmy4.3LV6N/AOpening Temp: 91 C / 196 F
2001GMCSafari4.3LV6N/AOpening Temp: 91 C / 196 F
2001GMCSavana 15005.7LV8N/AOpening Temp: 91 C / 196 F
2001GMCSavana 25006.5LV8N/AOpening Temp: 91 C / 196 F
2001GMCSonoma4.3LV6N/AOpening Temp: 91 C / 196 F
2001LincolnTown Car4.6LV8N/AOpening Temp: 91 C / 196 F
2001OldsmobileBravada4.3LV6N/AOpening Temp: 91 C / 196 F
2000CadillacEscalade5.7LV8N/AOpening Temp: 91 C / 196 F
2000ChevroletAstro4.3LV6N/AOpening Temp: 91 C / 196 F
2000ChevroletBlazer4.3LV6N/AOpening Temp: 91 C / 196 F
2000ChevroletExpress 15005.7LV8N/AOpening Temp: 91 C / 196 F
2000ChevroletExpress 25006.5LV8N/AOpening Temp: 91 C / 196 F
2000ChevroletS104.3LV6N/AOpening Temp: 91 C / 196 F
2000GMCJimmy4.3LV6N/AOpening Temp: 91 C / 196 F
2000GMCSafari4.3LV6N/AOpening Temp: 91 C / 196 F
2000GMCSavana 15005.7LV8N/AOpening Temp: 91 C / 196 F
2000GMCSavana 25006.5LV8N/AOpening Temp: 91 C / 196 F
2000GMCSonoma4.3LV6N/AOpening Temp: 91 C / 196 F
2000IsuzuHombre4.3LV6N/AOpening Temp: 91 C / 196 F
2000LincolnTown Car4.6LV8N/AOpening Temp: 91 C / 196 F
2000OldsmobileBravada4.3LV6N/AOpening Temp: 91 C / 196 F
1999CadillacEscalade5.7LV8N/AOpening Temp: 91 C / 196 F
1999ChevroletAstro4.3LV6N/AOpening Temp: 91 C / 196 F
1999ChevroletBlazer4.3LV6N/AOpening Temp: 91 C / 196 F
1999ChevroletC15005.7LV8N/AOpening Temp: 91 C / 196 F
1999ChevroletC1500 Suburban6.5LV8N/AOpening Temp: 91 C / 196 F
1999ChevroletExpress 15005.7LV8N/AOpening Temp: 91 C / 196 F
1999ChevroletExpress 25006.5LV8N/AOpening Temp: 91 C / 196 F
1999ChevroletK15005.7LV8N/AOpening Temp: 91 C / 196 F
1999ChevroletK1500 Suburban6.5LV8N/AOpening Temp: 91 C / 196 F
1999ChevroletS104.3LV6N/AOpening Temp: 91 C / 196 F
1999ChevroletSilverado5.7LV8N/AOpening Temp: 91 C / 196 F
1999ChevroletTahoe6.5LV8N/AOpening Temp: 91 C / 196 F
1999GMCC15005.7LV8N/AOpening Temp: 91 C / 196 F
1999GMCC1500 Suburban6.5LV8N/AOpening Temp: 91 C / 196 F
1999GMCJimmy4.3LV6N/AOpening Temp: 91 C / 196 F
1999GMCK15005.7LV8N/AOpening Temp: 91 C / 196 F
1999GMCK1500 Suburban6.5LV8N/AOpening Temp: 91 C / 196 F
1999GMCSafari4.3LV6N/AOpening Temp: 91 C / 196 F
1999GMCSavana 15005.7LV8N/AOpening Temp: 91 C / 196 F
1999GMCSavana 25006.5LV8N/AOpening Temp: 91 C / 196 F
1999GMCSonoma4.3LV6N/AOpening Temp: 91 C / 196 F
1999GMCYukon5.7LV8N/AOpening Temp: 91 C / 196 F
1999IsuzuHombre4.3LV6N/AOpening Temp: 91 C / 196 F
1999LincolnTown Car4.6LV8N/AOpening Temp: 91 C / 196 F
1999OldsmobileBravada4.3LV6N/AOpening Temp: 91 C / 196 F
1998ChevroletAstro4.3LV6N/AOpening Temp: 91 C / 196 F
1998ChevroletBlazer4.3LV6N/AOpening Temp: 91 C / 196 F
1998ChevroletC15006.5LV8N/AOpening Temp: 91 C / 196 F
1998ChevroletC1500 Suburban6.5LV8N/AOpening Temp: 91 C / 196 F
1998ChevroletExpress 15005.7LV8N/AOpening Temp: 91 C / 196 F
1998ChevroletExpress 25006.5LV8N/AOpening Temp: 91 C / 196 F
1998ChevroletK15006.5LV8N/AOpening Temp: 91 C / 196 F
1998ChevroletK1500 Suburban6.5LV8N/AOpening Temp: 91 C / 196 F
1998ChevroletS104.3LV6N/AOpening Temp: 91 C / 196 F
1998ChevroletSilverado5.7LV8N/AOpening Temp: 91 C / 196 F
1998ChevroletTahoe6.5LV8N/AOpening Temp: 91 C / 196 F
1998GMCC15005.7LV8N/AOpening Temp: 91 C / 196 F
1998GMCC1500 Suburban6.5LV8N/AOpening Temp: 91 C / 196 F
1998GMCJimmy4.3LV6N/AOpening Temp: 91 C / 196 F
1998GMCK15006.5LV8N/AOpening Temp: 91 C / 196 F
1998GMCK1500 Suburban6.5LV8N/AOpening Temp: 91 C / 196 F
1998GMCSafari4.3LV6N/AOpening Temp: 91 C / 196 F
1998GMCSavana 15005.7LV8N/AOpening Temp: 91 C / 196 F
1998GMCSavana 25006.5LV8N/AOpening Temp: 91 C / 196 F
1998GMCSonoma4.3LV6N/AOpening Temp: 91 C / 196 F
1998GMCYukon5.7LV8N/AOpening Temp: 91 C / 196 F
1998IsuzuHombre4.3LV6N/AOpening Temp: 91 C / 196 F
1998LincolnTown Car4.6LV8N/AOpening Temp: 91 C / 196 F
1998OldsmobileBravada4.3LV6N/AOpening Temp: 91 C / 196 F
1997ChevroletAstro4.3LV6N/AOpening Temp: 91 C / 196 F
1997ChevroletBlazer4.3LV6N/AOpening Temp: 91 C / 196 F
1997ChevroletC15006.5LV8N/AOpening Temp: 91 C / 196 F
1997ChevroletC1500 Suburban6.5LV8N/AOpening Temp: 91 C / 196 F
1997ChevroletExpress 15005.7LV8N/AOpening Temp: 91 C / 196 F
1997ChevroletExpress 25006.5LV8N/AOpening Temp: 91 C / 196 F
1997ChevroletK15006.5LV8N/AOpening Temp: 91 C / 196 F
1997ChevroletK1500 Suburban6.5LV8N/AOpening Temp: 91 C / 196 F
1997ChevroletS104.3LV6N/AOpening Temp: 91 C / 196 F
1997ChevroletSilverado5.7LV8N/AOpening Temp: 91 C / 196 F
1997ChevroletTahoe6.5LV8N/AOpening Temp: 91 C / 196 F
1997FordThunderbird4.6LV8N/AOpening Temp: 91 C / 196 F
1997GMCC15006.5LV8N/AOpening Temp: 91 C / 196 F
1997GMCC1500 Suburban6.5LV8N/AOpening Temp: 91 C / 196 F
1997GMCJimmy4.3LV6N/AOpening Temp: 91 C / 196 F
1997GMCK15006.5LV8N/AOpening Temp: 91 C / 196 F
1997GMCK1500 Suburban6.5LV8N/AOpening Temp: 91 C / 196 F
1997GMCSafari4.3LV6N/AOpening Temp: 91 C / 196 F
1997GMCSavana 15005.7LV8N/AOpening Temp: 91 C / 196 F
1997GMCSavana 25006.5LV8N/AOpening Temp: 91 C / 196 F
1997GMCSonoma4.3LV6N/AOpening Temp: 91 C / 196 F
1997GMCYukon6.5LV8N/AOpening Temp: 91 C / 196 F
1997IsuzuHombre4.3LV6N/AOpening Temp: 91 C / 196 F
1997LincolnTown Car4.6LV8N/AOpening Temp: 91 C / 196 F
1997OldsmobileBravada4.3LV6N/AOpening Temp: 91 C / 196 F
1996ChevroletAstro4.3LV6N/AOpening Temp: 91 C / 196 F
1996ChevroletBlazer4.3LV6N/AOpening Temp: 91 C / 196 F
1996ChevroletC15006.5LV8N/AOpening Temp: 91 C / 196 F
1996ChevroletC1500 Suburban6.5LV8N/AOpening Temp: 91 C / 196 F
1996ChevroletExpress 15005.7LV8N/AOpening Temp: 91 C / 196 F
1996ChevroletExpress 25006.5LV8N/AOpening Temp: 91 C / 196 F
1996ChevroletK15006.5LV8N/AOpening Temp: 91 C / 196 F
1996ChevroletK1500 Suburban6.5LV8N/AOpening Temp: 91 C / 196 F
1996ChevroletS104.3LV6N/AOpening Temp: 91 C / 196 F
1996ChevroletSilverado5.7LV8N/AOpening Temp: 91 C / 196 F
1996ChevroletTahoe6.5LV8N/AOpening Temp: 91 C / 196 F
1996FordThunderbird4.6LV8N/AOpening Temp: 91 C / 196 F
1996GMCC15006.5LV8N/AOpening Temp: 91 C / 196 F
1996GMCC1500 Suburban6.5LV8N/AOpening Temp: 91 C / 196 F
1996GMCJimmy4.3LV6N/AOpening Temp: 91 C / 196 F
1996GMCK15006.5LV8N/AOpening Temp: 91 C / 196 F
1996GMCK1500 Suburban6.5LV8N/AOpening Temp: 91 C / 196 F
1996GMCSafari4.3LV6N/AOpening Temp: 91 C / 196 F
1996GMCSavana 15005.7LV8N/AOpening Temp: 91 C / 196 F
1996GMCSavana 25006.5LV8N/AOpening Temp: 91 C / 196 F
1996GMCSonoma4.3LV6N/AOpening Temp: 91 C / 196 F
1996GMCYukon6.5LV8N/AOpening Temp: 91 C / 196 F
1996LincolnTown Car4.6LV8N/AOpening Temp: 91 C / 196 F
1996OldsmobileBravada4.3LV6N/AOpening Temp: 91 C / 196 F
1995FordThunderbird4.6LV8N/AOpening Temp: 91 C / 196 F
1995LincolnTown Car4.6LV8N/AOpening Temp: 91 C / 196 F

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

133992281957228195

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

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