First, let me pass along some wisdom to other the owners of older gas V-8's.
Symptom: Coolant overflow bottle is starting to get low or empty often. This can lead to running warm or even hot. Can cause a boil over or worse if not watched closely.
Possible causes: On the cheap, cracked hose or loose clamp, crack or a hole in the overflow bottle.
A little more expensive cause is a leaking water pump. If leaking from the weep hole under the center of the pump, even a drop or two, the seal is shot and a new or re-manufactured pump and gasket are in order. Normally, this takes an afternoon to change out, but since its buried deep inside the RV, it could take a whole weekend just to get enough parts removed to lay hands on it!
It will for sure cost a few bucks to have it done by a shop.
The most expensive cause, is a blown head gasket!
This is diagnosed by water on the dip stick. Water in one or both of the exhaust pipes is the other give away for a blown head gasket on the exhaust side.
Now, anyone that read my earlier post about our boil over on the first trip with the new to us coach will now see that the truth has been revealed!
I figured that since the seller had recently installed a new over flow bottle, he failed to fill it. I have a dirt/grass yard and never noticed a leak. Well, I had to drive it to work today so I could stop by the heavy truck tire shop to have a dual removed to rotate it 180 from the outside stem and pull off an old faulty stem extension and replace it with a gator cap. Cost me $20,
eat that expensive RV shop!
I went to work, and parked in our paved lot. When I went to leave, there was a long green wet patch under the front. I crawled under and coolant was on everything. So, I topped off the bottle, and came home. After I arrived, I left it running and crawled under. Sure enough, coolant is dripping out of the weep hole.
Not a lot, but enough. 64,000 miles is about right for a GM V-8 water pump to give up the ghost.
So, I guess a step by step water pump replacement instructional thread is in order! With pictures.