well it uses R-134a now, freon has been replaced with a less dangerous substance, but it could also be your blend door is stuck, which would be in the center console which is hard to get to.
Rattling, vibrating noise emitting from under the hood when cold, gets less as car warms up, but is...
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Rattling, vibrating noise emitting from under the hood when cold, gets less as car warms up, but is still there.