...reservoir in 99 Cadillac Deville? Just in case my "tree shade" mechanic is not available, how much do you think a shop would charge? It's leaking from hoses right around the opening of the coolant reservoir. My uncle had place some coaking material on the hose to stop the leak a few weeks ago but I guess it really needs to be replaced now. I know there are upper and lower radiator hoses. So I'm assuming that the hoses that leads from the reservoir is the upper hose.