This is likely due to bacteria/fungal contamination on the evaporator and/or the drainage system for any condensation off of the evaporator for the A/C.Everytime I start the air, or fans from ambient, cold or hot weather. The first 10 seconds smells like cat.....help, my dogs not happy lol
That is likely an anti-fungal and/or anti-bacterial spray that kills what's growin' on your evaporator.Also, as a maintenance procedure, I use a can of spray I buy at Autozone or Pep boys. You spray it in the vents and turn on the a/c and then the heater. Often customers complain of a "musty" smell when they turn on the air or heater. This seems to do the trick.
It might be more effective as a cleaning/disinfecting agent if you were to remove the cabin air filter prior to spraying. I suspect if you're spraying into the car with the filter in place that the filter itself absorbs a lot of the cleaning agents.To be more precise, you spray it into the systems air intake, which is usually located beneath the hood cowl near where the windsheild wipers park. Then you turn on the A/C for however long it says on the can. I always turn on the heater after the A/C as well. I do have a can in my car with my detailing supplies. I will check in the AM and post the name of it and what's in it on here.
Funny thing, fresh ground coffee smells like cat pee to me. Not the coffee once brewed, just that first minute or so after grinding the beans, the oils must have the same pH level or something so it triggers my "FKDFHAS CATTSSSSSSS DIE DIE DIE" hate for our cats.You must be working with some other gear oil...I've never smelled any that smelled like cat pee. I've grown up with a lot of cats so I know that smell well and that's not what gear oil smells like!
Yah, some people have posted pictures of their filter and it was a birds nest of leaves and garbage. Just add water to create a near perfect bacteria and fungal growth media. Hot from the sun hitting the dash, not directly in the sun so protected from UV, organic material for food.i just purchased my beetle and everytime you turned on the air it had a nasty stench. so i pulled the dash apart and found a bunch of leaves and the cabin air filter was beyond nasty. I would purchase a new cabin filter and change it out to see if it solves your problem.