Why is AC blowing warm air?
2008 ML350 has new AC compressor and full freon but still blows warm air. Has working belt. No code showing. What could be reason?
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Hi @justustm2
Have you checked that the relevant fuses in the engine bay fuse box are OK i.e. 40A fuse #108, 30A #111 and 7.5A #124?
I think that these are the ones related to the compressor operation and control unit but not totally sure so check what it shows in the fuse layout list in the lid of the fuse box.
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In addition, with ac enabled, temperature set to cold, engine idling, try measuring for 12v power to the compressor clutch. If its difficult to access the power wire to the clutch, make a temporary wire extension long enough to have the other end of this wire safely away from moving parts to measure for voltage (12vdc).
