Originally Posted by rburns515
No the engine is not overheating. Just the aux bottle now stays almost full and the coolant in the radiator doesn't stay topped off.
If you just leave the aux bottle full, and add coolant, does the bottle overflow?
Trying to figure out if you have a leak in the cooling system [those plastic radiators suck] or it is just moving coolant to the bottle, but can't generate enough vacuum to pull it back. All of that is controlled by the radiator, unless there is a small hole in the bottle or hose that leaks vacuum.
The cap on the bottle should have a small vent in it... can't see how it could get messed up, but worth checking.
You might be able to unhook the overflow hose from the radiator and use a long garden hose or similar to dump water into it and see if you spot any leaks along that hose. If it is limp at all replace it--may be collapsing.
See if you can find a radiator specialty shop instead of a general repair shop...
Will assume that the prior shop both pressure tested it and dye checked it under pressure. If not==incompetent.