Why is my Lexus LS 460 A/C, heat, or airflow not working? This Lexus LS guide is based on 2 documented technical cases, including 2 confirmed successful repair outcomes. It summarizes the captured evidence without assuming every vehicle with a similar symptom has the same cause. Documented applicability includes 2013–2015.
What Drivers or Technicians Reported
Documented complaints included: A/C did not cool and compressor would not engage; ambient display read -23 C.; Heater produced no heat..
Fault Codes Seen in Supporting Cases
Codes included B1412, B15F5. A code is a diagnostic clue, not automatic proof that a specific part failed.
Causes Confirmed in Documented Cases
Failed Front Controller in ambient-temperature signal path. Low coolant and trapped air after prior alternator/coolant-hose service.
What the Diagnostic Process Found
Correct for temperature Passed PASS Hot engine side / cold cabin side Almost empty
Repairs That Corrected Documented Cases
Replace Front Controller Fill and bleed cooling system
Repairs or Attempts That Did Not Solve the Original Problem
Replace ambient temperature sensor — unsuccessful
Lexus LS Diagnosis in Hickory, NC
Mich's Foreign Cars has served Hickory and the surrounding Western North Carolina area since 1983. We specialize in European and foreign vehicles and use professional diagnostic equipment to identify the cause before recommending repairs. If your Lexus LS is showing this symptom or fault pattern, call Mich's Foreign Cars at 828-324-6012 to schedule diagnosis.