Bought 2012 A5 used and unfortunately have been dealing with a somewhat sour smell coming from vents. Of this recall, the NHTSA officially stated, "The filter housing of the fuel pump (part of the fuel cap flange) may develop fine cracks/fissures resulting in a fuel leak or fuel smell." Unpleasant "musty" odor from Heating and Ventilation system. The video above shows you where the cabin air filter in your 2010 A5 … The affected models are listed below. If you're getting that musty smell, it's usually caused by bacteria in the aircon system. If your A5 Quattro smells bad when you turn on the heater or air conditioner, or it seems like the fan doesn't blow air as well as it used to, replacing your cabin air filter is a likely the best fix! It was fine before and it happens form … In the Audi Q7 e-tron quattro a heat pump with an electric compressor is responsible for heating and cooling. If your Audi A5 has a burning smell, there are a few different reasons that this can happen. I have a problem with my air conditioning on my A5. It happens both when asking for hot or cold air( ac off & on ) . This is definately a common problem on a BUNCH of Audi models. 2009-2012 Audi … I have a musty smell in my air conditioning system when I first start the car. … It will kill the bacteria in the system and give a nice fresh smell. Burning Smell Causes: Audi A5. Recently regassed the system as it was a little low, and after that it was working perfectly. Anyone have problems with bad/ sour smell coming from air conditioner vents? After these last fee hot days with A/C on, a unbearable smell like pee comes came through. The last few weeks a rotten eggs , foul smell has been coming into the cabin from the heater vents. I changed the cabin air … The first recall issued by the National Highway Traffic Safety Administration affects 143,214 Audi units. In 2015 Audi became the first premium manufacturer to use this technology in a production … Hi, my A/C was running absolutely fine with no smell at all. Get yourself an aircon cleaner (sometimes referred to as an aircon bomb) - it's a small aerosol which you leave running in the car with the air con on full blast until the tin runs out. Typically, the smell is caused by some type of fluid (oil, trans fluid, etc..) hitting the exhaust or other hot parts of the engine. Matter of fact, the problem is so common, Audi made a TSB on it. ... Audi A5 Forum & Audi S5 Forum. While there are a variety of reasons your Audi A5 Quattro air conditioning won't work, the most common 3 are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning … I've done some research on it and its caused from the condensation build up from turning your car off while the AC is still running. 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