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A/C condenser fan not working? A/C condenser fan not working?
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Old 06-12-2013, 06:03 PM
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A/C condenser fan not working?
Vehicle is an '05 3.0. This week my a/c recently started blowing significantly less cold and upon further inspection, it appears as if my condenser fan is not coming on at all. Should it come on whenever the compressor is engaged?

I just read through this thread and it seems that I am experiencing similar symptoms:

http://www.xoutpost.com/bmw-sav-foru...-question.html

Are there any specific tests I can do to test the fan? Thanks in advance-
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Old 06-12-2013, 06:17 PM
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Quote:
Originally Posted by RenaissanceMan View Post
Vehicle is an '05 3.0. This week my a/c recently started blowing significantly less cold and upon further inspection, it appears as if my condenser fan is not coming on at all. Should it come on whenever the compressor is engaged?

I just read through this thread and it seems that I am experiencing similar symptoms:

http://www.xoutpost.com/bmw-sav-foru...-question.html

Are there any specific tests I can do to test the fan? Thanks in advance-
It should, I think your fan is toasted! Search for Aux fan, you'll find info on how to test it with the scanner.
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Old 06-12-2013, 06:22 PM
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Aux fan is activated by a pressure switch on the low pressure side if the AC system. My fan began running slow when the system needed to be topped off. Once the low pressure reading was over 40psi on a 90 deg F day the fan sounded like an F4 Fantom at takeoff.
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Old 06-12-2013, 06:51 PM
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Quote:
Originally Posted by TiAgX5 View Post
Aux fan is activated by a pressure switch on the low pressure side if the AC system. My fan began running slow when the system needed to be topped off. Once the low pressure reading was over 40psi on a 90 deg F day the fan sounded like an F4 Fantom at takeoff.
Ohh... i like those planes.
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Old 06-12-2013, 08:55 PM
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Originally Posted by bugbyte View Post
It should, I think your fan is toasted! Search for Aux fan, you'll find info on how to test it with the scanner.
If I don't have a scanner, can I just run 12v directly to the fan to see if it works?
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Old 06-13-2013, 08:35 AM
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Quote:
Originally Posted by RenaissanceMan View Post
If I don't have a scanner, can I just run 12v directly to the fan to see if it works?
Or use a multimeter to verify voltage at the connector. Backprobe the wires or disconnect the plug and use clips.
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Old 06-13-2013, 10:03 AM
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Originally Posted by TiAgX5 View Post
Or use a multimeter to verify voltage at the connector. Backprobe the wires or disconnect the plug and use clips.
Thx-

I'm seeing 3 leads in the connector. Used a multimeter and looks like one is ground, one is showing 12v, and the other some sort of micro voltage... Not sure what it should be. After some searching, I found that it sends a pulse signal. If i'm seeing voltage at the connector, can I safely assume that the fan is bad, or is the system a little more complex than that with respect to how/when it kicks in the fan? The a/c still blows relatively cold when not at a standstill. Thanks for the help, everyone-
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Old 06-13-2013, 10:21 PM
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UPDATE: Got confirmation this morning that the fan was toast from an indy shop with a GT1... Evidently you can activate it directly from the software. Ordered the fan immediately after and got it installed a couple of hours ago. All is chilly again at stoplights! Thanks for the replies and the insight-
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Old 06-14-2013, 11:26 AM
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Good to hear.

You might want to check the R134a pressure. When I had a reading of 30psi the center vent temp was just below 50 deg F @ 90 deg outside, getting the R134a pressure to 43 psi the center vent temp dropped to 34 deg F @ 90 deg outside. It's brutally cold now!

OBC outside temp was showing 103 F here in DFW, I was able to run low fan/recirc and the inside of the truck was COLD!
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Last edited by TiAgX5; 06-14-2013 at 11:33 AM.
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Old 06-14-2013, 02:01 PM
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Thanks for the headsup. I'll get that checked, as well. I'm just so happy to not be sweating inside the truck!

Quote:
Originally Posted by TiAgX5 View Post
Good to hear.

You might want to check the R134a pressure. When I had a reading of 30psi the center vent temp was just below 50 deg F @ 90 deg outside, getting the R134a pressure to 43 psi the center vent temp dropped to 34 deg F @ 90 deg outside. It's brutally cold now!

OBC outside temp was showing 103 F here in DFW, I was able to run low fan/recirc and the inside of the truck was COLD!
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