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X5 E53 (1999 - 2006)
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  #1  
Old 08-02-2016, 03:50 PM
Notplayn Notplayn is offline
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Mein Auto: 2001 X5
Anyone know how to correctly diag a non-working condenser fan?

My condenser fan is not coming on when ac is turned on. It has 12v hot all the time. Need to figure out if it is not receiving a signal to come on or it is just faulty. thanks
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  #2  
Old 08-02-2016, 08:31 PM
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Zulu95 Zulu95 is online now
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When you start the engine does it spin up briefly? When you start the engine the ECM signals the fan to spin up to 20% of operating speed to sense if it is working. If you have a scope put it on the PWM signal wire on the fan. (Thin wire.) A computer dealer/indy/PAsoft etc should also be able to test the fan.
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Old 08-05-2016, 06:45 PM
Notplayn Notplayn is offline
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Hey Zulu, no it does not spin at all ever no matter what.
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Old 08-06-2016, 05:31 AM
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Then you need to decide how to proceed:
1. Change out the fan.
2. Buy the software/specialist code reader such as Foxwell etc. to diagnose and most likely change out the fan.
3. Take it to a $tealership/indy and have them diagnose/change out the fan.
4. Buy a scope to "read" the PWM signal at the fan.

The fan is the most likely culprit. There are a number of things that may prevent it running with the AC but for the start-up test it is the fan or the ECU.
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Old 08-11-2016, 12:36 PM
upallnight upallnight is offline
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Does your AC works when you are on the highway, but doesn't cool when you are in stop and go traffic? If this is the situation you need a new aux fan. Couldn't be a simpler diagnosis than that. If you AC doesn't work at highway speed or stop and go traffic you have a problem with the AC system.
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