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Discussion Starter · #1 ·
2011 CT200h with 100k miles.

So here's the issue... The HVAC unit stopped blowing cold air after replacing the heater core unit (dash disassembled) and the A/C compressor is not running.

All fuses and relays have been checked.

Held down the climate control system ''AUTO'' and ''FRESH/RECIRC'' buttons and code number 23 came up.

I've also scanned the ECU for trouble codes:

- U0164 ''Lost communication with HVAC Control Module''.

Appriciate your input regarding the above issue before going to the repair shop ''gussing work''.
 
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