C32 AMG, C55 AMG (W203) 2001 - 2007

AC blows hot after Coolant flush

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Old 06-09-2023, 10:25 PM
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2005 Granite Gray C55
AC blows hot after Coolant flush

As mentioned in the title, I had to do three parts to this job. I had to replace my alternator, coolant expansion tank, and radiator cooling fan all in one go.

I had to drain the coolant to remove the fan > expansion tank > alternator. Upon reinstalling everything and filling up the coolant, i ran the fan on high, heat on low, and coolant expansion tank cap off for 25 minutes.

The AC now doesn't blow cold, just warm ambient - hot air temperature.

Any suggestions on what the issue may be? I know it's a closed loop system so I shouldn't have lost or had issues with the AC but I could be wrong. 🤷

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