[77newell]

I just replaced the coolant booster pump on my 93 coach. During that process I used plastic pliers designed for pinching hoses and they worked just fine, I probably lost a total of 1 cup antifreeze.

If you need to change the shutoff valves you could do the following; Close all the shutoff valves and disconnect the hoses. Then hook a temporary hose up the the lowest one and drain cool coolant into the plastic 5 gallon flexible water carriers campers use. Drain until no more fluid comes out and you have the fluid low enough.

Based upon everything noted in this thread about the valves I strongly suspect that the valve stem has a disk that when the valve is fully open rises to the bottom of packing in the valve bonnet and creates a seal. This is unlike the usual packing around a valve stem that crushes in against the stem to create a seal; this kind of seal works in all positions but will never seal as tight as with the disk type seal. If I am correct, always questionable, then the valves we have on our coaches will almost always leak when they are in any position other than fully open and with no pressure in the line including from back pressure from the valve on the other end of the line being open. If there is a leak when the valve is "open", the first step is to assure that it is turned tight against the packing.