yes
like burning cocaine, depending on what nastiness it may have been "cut" with.
Sounds like your heater has dust bunnies and needs a good cleaning, when dust or fluff heats up it starts to singe or burn causing the burning smell.
Its just the wax they have on them to stop them from rusting while in storage
pollution or Bactria or that it's been sitting still for about 2 days
There would have been a strong smell of burning, smoke and dust.
cut in half a load of lemons put them in close the door and leave a couple of days
No, they do not. If you smell ammonia it is not coming from the heater unless something has been put inside the heater and is burning.
If the car is a manual and you are riding or slipping the clutch it could be that. Otherwise if you have been real hard on the brakes lately they can create quite a smell aswell.
If you smell wires burning, most likely that is the exact problem. If two wires were to melt together it would short the battery and kill it very easily.
Use your judgement. Look at it, smell it, taste it . If you have any doubts discard it.
Gasket is leaking oil. Valve cover gasket is likely suspect.
you would cry too if your legs and arm had been cut off and you were sitting at the edge of lava river which was burning you