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Pontiac G8 Thermostat is in the middle of this vibrant sedan, but it is the car that deserves commendation first. The Pontiac G8 is a combination of soul, providing a 6.0 liter V8 that delivers good horsepower and torque yet capable of achieving good mileage, a spacious cabin, tight steering and optional sport package that tightens the handling in its day trips to the office or weekend track day. Drivers like the way Pontiac has maintained a balance in weight, the way the G8 platform allows the drivers to have confidence in the rear wheel drive and how the quality in the construction has held up despite the fact that the production ceased some years back. In order to maintain this performance, the G8 is dependent on an accurate system of engine cooling, and the Thermostat is the coolant guardian. A Pontiac G8 Thermostat monitors the temperature in the block and remains shut in cold however when the engine is starting, it opens to allow the engine to reach optimum temperature, then closes to allow coolant to reach the radiator and stabilize the temperature. The Thermostat is a small component that plays a big role by protecting power output, fuel economy and the life of the gasket as a result of its correct cycling. It is easy to replace the unit, when the engine is cool, disconnect the battery, empty coolant below the housing, unscrew the top hose, unscrew the cover, record orientation, replace the Thermostat with a new clean one and tighten everything, then refill and bleed the system, and start the Pontiac with the check of leaks.