Our 2013 Santa Fe has this hissing sound I hear inside. The hissing sound disappears when rear ac is turned on.

Aircon is very cool. But sometimes, it does not cool that fast.

Low freon kaya? Last month may nireplace na hose yung casa kasi may leak. Baka hindi tama ang amount na freon ang inilagay hence the hissing sound and intermittent fast cooling.

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