I can tell you this, get your water pump replaced BEFORE you replace the thermostat. I just had everything replaced and here's what happened. My water pump was missing one impellar and had another broken one. My thermostat was completely busted too(one side was completely cool, and one completely hot). My mechanic went ahead and replaced the thermostat, then referred me to a guy who can replace the waterpump at a Ford dealership. So I went there, and as it turns out, the short drive there allowed another piece of a impeller to be lodged in the thermostat, causing the BRAND NEW thermostat to be replaced with yet another.
