Bought a 1996 gmc, 350 gas, P30 3500hd thomas bus, 97,000miles. Has 6 windows on one side, so its a little bigger than most short buses. Anyway, was checking out radiator. All I have is the gmc book for truck and no thomas manual. The bus has extra air up on ceiling in back. Also has extended hood with different, elonggated radiator system. It appears to have green antifreeze in it. Book says it should have orange for truck. Wondering if its changed to green because of back air? I suppose it may be the new generic stuff that mixes with anything as it does look sort of weak green but floats 5 balls. What have you found and use. Should I drain the whole deal and put in orange? Its run this long with whats in it. Any advise. Thanks in advance.