I think that you may have an oil leak,which is getting on to the front section of the exhaust and whilst travelling along the fumes are being blown away, unlike standing at trafic lights, they are rising up under the bonnet and drifting through the heater/air vents, especially after along motorway run ,I have also had this happen to me!!
The first and easiest answer that comes to mind is that there is a problem with the cabin air circulating fan. BUT - - there is not really enuf specific information. Are you sure it is a burning RUBBER smell, or a burning PLASTIC smell, or a burning ELECTRICAL smell? All could point to different problems.
Sometimes after you ejaculate, there can still be some sperm left over in the vas deferens of the penis, which is where the smell might be coming from.
Most of the time it is caused by a hole in the heater core, do you smell a sweet smell? The sweet smell would be the antifreeze.
A smell coming from a reverse cycle air conditioner may be a signal that the filter needs to be cleaned. A smell like engine exhaust might be present if the air conditioner motor is in need of repair.
Bacon Coffee Eggs Pancakes Sausage Donuts
There are many different kinds of smells that could be coming from the brakes. There could be a burning smell.
They didn't kiss, Chris just wanted to smell Rihanna's especially pungent gas and make sure that it was coming from her. He was right.
They go in dirt and leaves that's where the smell is coming from
Coming out of where, when, what color, smell, ect. More information needed.
They can smell them
They generally smell like whatever flavor they are...especially straight out of the oven
the best possible guess I could think of is mice... If it's a chemical smell, you might have a heater core leak. If it's a mildew smell, maybe you have an interior air filter that is funky.