Tag
#HVAC
3 posts in Car Diagnostics blog about "HVAC" — OBD-II diagnostics, DTC codes, repair. ← All posts
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Heater warm on one side only: blend door or airlock
Hot air from one vent and cold from another means a flap is stuck or the matrix is not getting full flow. Two causes, two very different repairs.
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Hissing from the vents: blend door, refrigerant or a blocked drain
Some hissing from the dashboard is normal air conditioning behaviour. Some is a leak. The timing and the accompanying smell separate them.
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HVAC deep-dive: climate control via OBD, blend-door actuators, servo motors — when the cabin heats "from one side"
Dual-zone climate control via OBD: codes B12xx, blend-door actuator state, mode-door, vent output temperature. How to diagnose "warm on the right — cold on the left".