I've got a 2008 R56s. Just replaced the thermostat housing 2 years ago and I'm running into problems with it. I replaced the temp sensor and it didn't help it. Is there any way to tell if the thermostat is bad? It still looks brand new. It's been running about 160Â°F so the conclusion I came to was that it's stuck open. Doesn't make sense with such a new thermostat.