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AC PROBLEM; TROUBLESHOOT NOISE AND ODOR

It is not uncommon to see motorists complaining about noise and odor oozing form their AC
NOISE--If the noise is coming from your compressor, it's usually means your compressor is wearing out or serving it's final days. This noise could also be the result of contaminated refrigerant, using the wrong type compressor lubricant and air in the system
Noise could also be caused by parts of the system like the hoses rattling against other components in the engine

ODOR-- If your vehicle air conditioning blows out funny air, the most likely cause is fungus, molds and/or bacteria living in your vehicle's climate control system (typically they congregate in the evaporator core and/or near the condenser in your A/C unit). These critters move into these areas because it's a moist enclosed space, and while some cars have a bigger problem with this than others, it's very common

To get rid of the unwanted organisms, various chemicals like lysol antiseptic spray can be sprayed on the evaporator directly or through the blower ducts or air intake

The key to really preventing this in the future is a very simple practice. Starting now, turn off the A/C at least 2 minutes before you shut off your vehicle - preferably 5 minutes - but leave the fan on. Just get in the habit of shutting your A/C off at a certain point on your commute. This way, your system will dry quite a bit before you shut off
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