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BMW 3-Series (E90 E92) Forum
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AC Blows hot air!!! (Not DIY)
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07-22-2016, 09:38 AM | #1 |
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AC Blows hot air!!! (Not DIY)
I just picked up my convertible n54 not too long ago, and to say the least I'm in love with this car. My only issue is... the AC is blowing hot air out; I'm thinking it needs a recharge. Since the car was rarely driven by its old owners and sat in the garage all day I think the refrigerant leaked. just wanted a second opinion and see what you guys thought! Thanks.
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07-22-2016, 09:41 AM | #3 | |
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07-26-2016, 10:00 AM | #5 | |
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09-06-2016, 03:19 PM | #6 |
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I want to throw this out there for anyone charging the A/C themselves. I knew that my system was not working up to it's potential and tried to add some Freon using the cheap auto parts single(suction) gauge recharge kits.
On my car, regardless of how much freon I added, I could not get the suction pressure even close to where the tables show that it should be for the temperature that I was charging it at. I ended up hooking up some professional gauges and I had overcharged the system according to the high pressure side, while the low pressure side was still showing low. I consulted with a friend (licensed A/C tech) and he told me that the tables are designed for fixed orifice systems and many newer systems use a temperature compensated variable orifice (like a wastegate) to manage the pressures and keep optimum performance in all conditions. He told me to adjust the charge to get the high pressure side within spec's and ignore what the low pressure side said, and see how that works. I followed his advice and the A/C was soon blowing out 38 degree air and cooling perfectly. The suction pressure is barely showing any higher (2-3 lbs) than before charging, although I added nearly a full (large) can of Freon. TLDR version, you cannot rely on the auto parts single gauge kits to get the pressures right on your 335i, at least not on mine. |
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09-19-2016, 10:12 AM | #7 | |
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09-19-2016, 09:11 PM | #8 | ||
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