04 530I Coolant smell

[wckdblnd]

I've had an issue with a coolant smell for over a year..It only happened when i was at a stop on an incline...changed thermostat already- Now it's happening all the time except when the a/c is on and no check engine light at all- I've seen it "smoking" from the under the hood passenger side towards rear ...Any thoughts please....

[pcy]

Is the coolant low in the coolant reservoir?
coolant smell and the smoke (coolant burning off on hot engine/exhaust manifold??) indicate there is definitely a coolant leak.

You will have to open the hood and look when the engine is hot; use a flashlight, if necessary.

[Jaycal3]

Check your coolant expansion tank for leaks underneath - its a known problem in older e60's. Check hoses too.