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ACDelco GM Original Equipment Engine Coolant Thermostat Housing Gasket 12681140

GM Original Equipment


An ACDelco GM Original Equipment Engine Coolant Thermostat Housing Gasket is a GM-recommended replacement for your vehicle’s original component. It seals the gap between the exterior of the thermostat housing and the exterior of the engine. This original equipment engine coolant thermostat housing gasket has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.

Pricing: $4.26


Engine Coolant Thermostat Housing Gasket

Get the GM quality you know and trust with ACDelco GM Original Equipment Thermostats and Caps. Stay with the brand of parts your General Motors vehicle came with and get peace of mind that the fit, form, and function is up to the high standards and specifications of General Motors. ACDelco GM Original Equipment Thermostats and Caps are engineered for virtually every model of GM car, light duty truck, and sport utility vehicle.

Warranty: 24 Month / Unlimited Mile Limited Warranty on parts sold on or after 04/01/18. (Parts Only) Please see for more details.

Features & Benefits:

  • Seals the gap between the exterior of the thermostat housing and the exterior of the engine to help prevent leakage
  • GM-recommended replacement part for your GM vehicle's original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function


Q: Could a damaged thermostat affect engine performance?
A: Yes, a broken thermostat could cause the engine to overheat and lead to engine damage.

Q: Could a damaged or missing thermostat affect fuel economy?
A: Yes, every engine is designed to run at a specified temperature. An engine that runs cold (without a thermostat) may use 10-20 percent more fuel and will not run properly.

Q: Is there a way to verify that my vehicle's thermostat is functioning properly?
A: Yes, the thermostat can be tested by boiling it in plain water for approximately 3-5 minutes. If the thermostat does not open, it should be replaced.

Q: Could a damaged thermostat affect interior heat?
A: Yes, the thermostat can become stuck in the open position. This will prevent the engine from reaching operating temperature in cold weather, resulting in poor interior heater performance.

Maintenance & Troubleshooting

Signs of Wear & Troubleshooting

  • Signs of wear include:
    • Coolant leak
    • Overheating of the engine
    • Lack of available heat in the vehicle cabin
    • Reduced fuel economy

Good Maintenance Practices

  • Maintain proper coolant levels and check level monthly (Note: Never attempt to remove a radiator cap while the engine is hot. Serious injury could result).
    • Replace coolant with a mixture of antifreeze and water according to the vehicle manufacturer's recommendations.
    • Inspect engine belts for cracks or missing sections; check belt tension.
    • Evaluate radiator and radiator cap for leaks, corrosion, or a worn cap gasket.
    • Examine hoses every 12 months. Look for leaks, cracks or rot. Replace when showing signs of wear.
    • Tighten any loose clamps. Always replace clamps when replacing hoses.
    • Have cooling system inspected immediately if instrument panel-mounted temperature gauge indicates engine overheating.
    • Periodically, remove bugs, leaves and other debris from the front of the radiator. They can block airflow and substantially reduce cooling efficiency.

California Proposition 65

California Prop 65WARNING: Cancer & Reproductive Harm -


  • 12681140
  • 12681140
  • ACDelco
  • New

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