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Old 05-30-2013, 05:22 PM   #1
Dave@Bimmer_Speed
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Question A/C Question for the AC Gurus

2003 BMW 325i


My AC only blew warm air so I used a vacuum pump to drain the system and then I checked if the system held pressure (No leaks). I used one of those tools that connect to both the Low and High pressure ports (No that walmart crap) to put in the freon. I've successfully done this on other cars before by the way. But after putting freon into the system ONLY Cool Air blows and not Cold air. The AC Compressor works and there aren't any leaks.

Does anyone have an idea of what could be going on? One of the tubes clogged maybe?
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Old 05-30-2013, 06:39 PM   #2
vandyboy
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Is the center vent moved to blue instead of red? Did you overfill or underfill?

I don't know your process for adding refrigerant, but this is how I was taught. Hook your high and low side hoses and r134 back up and get someone to sit in the car. Turn the car on and put the A/C on max with the fan on high. Have the person keep RPMs at 2000 while you measure how much refrigerant is in the system. Either let some out or add some more until the person in the car tells you when the A/C gets cold
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Old 05-30-2013, 07:01 PM   #3
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In the A/C DIY thread it mentions changing the drier when the system is exposed to the atmosphere, so I wonder if you need a new one of those (i.e did you system lose vacuum and allow air to get in)
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Old 05-30-2013, 07:14 PM   #4
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Unless you used the proper gauges... You'll never really know how much R34a is in your system. If it was totally flat... You may have lost the oil charge... As was mentioned... The Dryer could be shot too.

I'd take it to a place that can recover what is in there... Draw a vacuum and then install all the right stuff in the correct amounts. It doesn't cost much if you find the right place.... As long as they don't have to replace the dryer for you or something like that.
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Old 05-30-2013, 07:40 PM   #5
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A professional recharging might cost $75. Getting your compressor fixed because you over or underfilled it would be $$$...over a thousand at most shops.

Take it to a professional. You'll note that r134a capacity is under the hood...given in lbs. 1.86 +/- .05 lbs. on mine. You can't get that by measuring only pressure. A shop has a machine that will fill by weight and you'll know it's right. Not worth it. afaik, if you make a sizeable mistake with 134a levels you can damage a compressor.
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Old 05-31-2013, 09:08 AM   #6
Dave@Bimmer_Speed
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What do you mean by a lost oil charge?
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Old 05-31-2013, 09:30 AM   #7
Yewzer B Lewzer
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A/C Question for the AC Gurus

The compressor has oil in it, and about 10% of that oil flows in the refrigerant through the system. Leaking systems will eventually run the compressor low on oil.


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Old 06-07-2013, 04:30 PM   #8
TEAMAFLCON
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Quote:
Originally Posted by Dave@Bimmer_Speed View Post
2003 BMW 325i


My AC only blew warm air so I used a vacuum pump to drain the system and then I checked if the system held pressure (No leaks). I used one of those tools that connect to both the Low and High pressure ports (No that walmart crap) to put in the freon. I've successfully done this on other cars before by the way. But after putting freon into the system ONLY Cool Air blows and not Cold air. The AC Compressor works and there aren't any leaks.

Does anyone have an idea of what could be going on? One of the tubes clogged maybe?
This is EXACTLY what is happening to mine.

2003 325I with 94K miles.

Compressor is working, but a guy at Autozone told me that it had too much refrigerant. He told me this when he tried to recharge it using those $40 deals at Autozone. He was trying to fill it up but it wouldn't let him. The gauge showed that it was full (way in the red using that little gauge).

Last edited by TEAMAFLCON; 06-07-2013 at 04:39 PM.
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