Simple assembly that bolts directly to the water pump - quick and easy. The only problem I had was that one of the original thermostat housing bolts broke when I tightened it with a torque wrench. It took about 90 minutes to visit 3 parts shops to find a place that stocked the right size, thread pitch and length. Considering GM's cost of these bolts is probably only a penny or two, I'd appreciate new ones being included in the package. Just to note that this appears to be a 187* thermostat. I didn't see it in the product information, on the packaging, or on the thermostat itself. Most likely this is the same one that came new from the factory in your car.
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