Why is my car AC blowing warm air and stuck on the wrong vents?
Car air conditioning faults often stem from failing components like a wobbly AC clutch or blend door issues that misdirect airflow. These problems leave drivers wondering whether they need to replace the entire compressor or just individual parts like the pulley and clutch.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1scanning for fault codes using VCDS
- 2attempting to recalibrate ventilation positioning motors via diagnostic software
- 3replacing pressure sensors or faulty ventilation motors
- 4Replacing only the clutch or pulley assembly rather than the entire compressor
- 5Inspecting and listening for noise changes when the AC is toggled on and off
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“my 2004 vw golf mk5 2L diesel doesn’t blow cold air, and it doesn’t go trough the vents it should. These are the faults i found on my vcds, is this a expensive repair???”source ↗
“Started hearing intermittent chattering/light squeaking on cold starts the past few days. Popped the hood and just noticed my AC Clutch looks wobbly when the AC is running.”source ↗
“Would this require changing the entire compressor or just the clutch/pulley?”source ↗