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Any smell from the car vents is unrelated to the AC system unless it is an antiseptic smell. Generally, the smells are environmental from your engine compartment, where the fresh air is taken from. If you smell something burning from the vents, then something is heating up to much under your hood. Check your compressor for a worn clutch, or oil leaking onto the exhaust manifold.
Several thing scan cause a burning smell from a car A/C. One cause can be that the compressor is burning up. Another possibility is a wiring shortage.
you have a bad heater core in your vehicle
Freon is odorless, but it is possible to smell the refrigerant oil that could also be leaking.
There is no smell, unless somebody has used something like 22a freon which is actually propane and may have a sulphur smell
Freon is odorless because it is a combination of gas and oil. However, many believe it can be detected by a sweet smelling fragrant in the air.
almonds or peach kernels
u smell like ppoopv
This normally indicates a refrigerant leak. STOP USING YOUR AC IMMEDIATELY AFTER THE ACKNOWLEDGEMENT OF THIS SMELL!! The fumes from the fluid in your AC system are highly toxic. The leak needs to be sorted out before the AC can be used again.
The balloon will eventually pop, and you most likely can find its pieces at the coil if using AC, or smell rubber burning if using heater.
Depends on the smell. What does it smell like?
it is probably the ac compressor locked up