[qcj]

The way my 99 works is when going down the road the engine coolant will circulate through the AH and heat the water so you will have hot water when stopped, and it sort of helps cool the engine a slight bit. When I am in a park and it is 30 degrees out and my AH is running, so that the water is hot it has a pump on the AH that circulates the engine coolant through the engine to help warm it up a bit. I have a switch above the drivers seat that said Engine Preheat which cuts on the pump. The only preheat I have is the AH.