The Case of the Frosty Receiver-Drier

A receiver-drier should be warm to the touch during normal A/C operation, so frost on the drier canister indicates an internal restriction (it’s normal for frosting to occur during the recovery process). It’s a good sign that the drier needs to be replaced. Use a quality all-makes replacement, mark the installed date on the canister so it’s easy to see, and check the moisture indicator on the sight glass at every oil change.