ACDelco GM Original Equipment Thermostat 187°F 131-160 (89018168) with Gasket — Direct-Fit OE Replacement

The ACDelco GM Original Equipment 131-160 (89018168) 187° thermostat with seal is a direct-fit replacement that controls coolant flow to help your GM engine reach and hold the correct operating temperature.

This ACDelco kit includes the thermostat and a matching gasket manufactured to GM original-equipment specifications. Designed as a recommended replacement for the factory-installed component, it restores the intended coolant flow behavior and mechanical fit without the guesswork of aftermarket mismatches. Built to the same tolerances GM engineers require, the part aims to deliver the expected durability and service life for compatible GM models.

How does this thermostat affect engine temperature management?

The thermostat opens and closes based on coolant temperature, regulating flow between the engine and radiator so the engine warms up efficiently and then stays within its designed temperature range. A properly functioning thermostat prevents overcooling during warm-up and reduces the risk of overheating once the engine reaches operating temperature.

• Opens at 187°F (approx.) to allow coolant circulation.
• Closes when below set temperature to speed engine warm-up.
• Precision valve action reduces temperature swings during load changes.
• Gasket included to ensure a leak-free installation.

Will this fit my GM vehicle and replace the original thermostat correctly?

Yes — this is a GM Original Equipment (OE) replacement designed for direct compatibility with specific GM applications. It is manufactured to the same fit, form, and function standards as the factory part so you can expect the same mounting points and sealing surfaces.

• Made to GM OE specifications for accurate dimensions.
• Includes the matching seal/gasket for a proper fit.
• Sold under part number 89018168 / 131-160 for reference when cross-checking vehicle fitment.
• Recommended as the replacement part by GM for original-component swaps.

What are the installation and maintenance considerations?

Installation typically involves draining coolant to below the thermostat housing level, removing the housing, swapping the old thermostat and gasket for the new kit, and refilling with the correct coolant mixture. Use proper torque on housing fasteners and a new gasket to prevent leaks; inspect hoses and coolant condition while servicing.

• Replace gasket to ensure a leak-free seal each time.
• Refill and bleed the cooling system to remove air pockets after install.
• Check hose condition and clamps during service for best long-term performance.
• Follow OEM torque specs and replacement intervals recommended by the vehicle manual.

What performance and durability should I expect from an OE thermostat kit?

Because this thermostat is produced to GM's OE requirements, it should match the original unit's thermal response and mechanical durability. The assembly is intended to provide consistent operation over the same service life as the factory-installed component when used in compatible vehicles and maintained correctly.

• Thermal opening point engineered to GM calibration for reliable temperature control.
• Durable materials and construction to withstand typical engine bay conditions.
• Gasket included to maintain a tight seal under repeated thermal cycles.
• Recommended by GM as the correct replacement for factory units.

Who is this for: The ACDelco GM Original Equipment 131-160 (89018168) 187° thermostat kit is intended for owners, technicians, and DIYers who need a genuine OE-style replacement for compatible GM cars and trucks. Choose this kit if you want a direct-fit thermostat with the matching gasket, built to GM specifications, to restore proper coolant control and minimize installation uncertainty. Always verify vehicle compatibility with your VIN or parts catalog before ordering.