Well, that's pretty general but... USUALLY, sun=heat, snowflake=cooling, water drop=dehumidifing, fan blades =Fan only.???
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SOURCE: Where do we put freeon for the air conditionner
There are only 2 fittings on your ac system. The low side is the one you put in refrigerant (r134a). It is the smaller sized fitting usually located on low side hose that connects to receiver dryer (looks like a can on passenger side firewall). The quick connect fitting on any recharge hose will only fit on this correct fitting. The other one (high side) is too large to fit. So you cant put it in the wrong one.
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