The aux fan isn't needed to blow cold AC unless you aren't moving. You def need to get some pressure numbers if the AC blows hot air initially. Need a little more info like does the blower blow right away just hot?
When compressor kicks in cold is nearly immediate. If it's hit and miss that's usually a problem with a variable compressor. Get readings when it is working and when it's not to confirm.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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