The belly button lint in the sensor does need to be cleaned occasionally, when it gets bad enough, the blinking lights of death will flash 20 times to let you know that something is wrong. A vacuum with a crevasse nozzle works pretty good.
I have never had a problem with icing, mostly because I never change the temp settings. If the car is hot, the blower will run full blast. If the car and engine is cold, the blower will slowly start when the coolant temp increases.
I just wish the older models had better systems to remove the water after the engine is turned off. My 95 needs a new evaporator core...
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Keeping it running is better than buying new
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