I have a steady drip from a drain hole at the waterpump when the truck is running. It is reduced when I loosen the rad cap and there is little or no leak when parked. I'm familiar with typical pumps on jeeps and dodges etc but this seems different: a pump mounted in a housing. Do I just remove the pump or the pump and housing. Do i have to remove the rad (as per manual) or is there room to work? Finally does the housing fill with coolant and why wouldn't always leak through the drip hole. The answer may become obvious when I remove the water pump but from the I don't see the relationship between the pump and the housing. .... Brian