If the clicking noise is from the dash its the heater control valve and see below
I had the exact same problem, yes it was the heater control valve, the repair was 285.00. The tech that replaced it told me it is a common problem for the Galant. He said that if you keep your temp selector on either all hot or all cold that it keeps constant pressure on the plastic gear teeth in the valve. As they break off one by one you begin to hear that clicking noise as the dont catch. When you finally break off the last one it stops working.
According to him if you always leave the dial at least one notch from fully hot or fully cold you will not experience a failure of the switch
YOUR AC CLUTCH IS GOING OUT,GO AHEAD YOU NEED TO GET IT DONE SOON OR IT WILL COST YOU MORE LATER
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