Oily smoke/mist coming from under bonnet from large pipe feed
Rattling noise heard for about 25 miles then suddenly stopped and oily smoke/mist came into car. under bonnet looked like it was coming from a large hose connected to ?filter at very top and front of engine near radiator. Engine was running and behaving fine. Is it the air con or something more serious and can I drive it to a garage?
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you more than likely have a sciezed air con compressor. most modern cars have climate control which uses air con even when demisting and when engaged the electric clutch tries to engage but the pump itself will not turn, clutch will get red hot and burn your belts
This is the Diesel Cabin Heater. It will only come on when it is cold and comes on automatically when you start the car. If you do a short journey you will often see smoke coming out and occasionally hear some noise. It can continue to run for a few minutes. There are no controls for it but you will see a yellow light on the dashboard next to the right hand indicator light. It will only operate if it is cold and you have more than 100-120 miles of fuel left in the tank.
u have a leak in the heater core the oily smell and mist is anti freeze sounds like a small leak because usually u would have a wet floor if it was large -two choices check and repair as necessary the core or can use an additive with a stop leak they usually work well on small leaks
it sounds like your alternator let go, therefore your battery is not charging, you will need to investigate further but the rattling would be explained by the alternator mechanically breaking internally and failing to charge the battery resulting in your present situation
It almost sounds like you have a heat shield that is loose on your exhaust system. Let it cool, and try to reach under, lightly bumping the exhaust pipes with your hand. If you hear any rattle noises, or squeeks then you have a loose shield. you can ither remove the shield, or try to use a large clamp to go around it and tighten it up.