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Q:

heat and ac display just blew out on 1992 Lexus SC400

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
how much does it cost to fix and why does it blow out???
(1) Answer
They fail in time, LCD's do not last forever. Vibration, voltage spikes and heat variations cause wear and tear on the physical components of electronics. Sorry it broke, but you didn't do too bad, the car's 19 years old!
You'll need to call a Lexus specialist or an auto electrical shop for help getting replacement parts or repairs.
Here's a directory link for you:
https://repairpal.com/directory?address=21040&car_brand_names=Lexus