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  #21  
Old 06-30-2020, 10:34 AM
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Again, the DME won't engage the compressor if it thinks there is a problem with AUX fan, using the scan tool to turn on the compressor by-passes that feature. The aux fan does not engage the compressor, the DME does. Knowing if the compressor clutch is not engaging when there is no cooling is much more helpful than knowing the clutch is engaged when it is cooling. If you don't have cooling or clutch engaging when the car is idling, work with that and the aux fan code that you have, especially since you already had the system checked, evacuated and recharged by someone that has guages.
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  #22  
Old 06-30-2020, 11:07 AM
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Quote:
Originally Posted by FellowsheepTech View Post
Yes, I've checked/monitored states in live data; have been seeing state of activation but no clutch engagement or fan movement. Yet when I command them to activate they do. How can it respond to the tool & not the DME?

1. Control Panel saying it's sending the signal but not doing so? I've replaced the control panel, but no proof they aren't both bad. Everything else seems to work on the panel.
2. Evap temp sensor seems like it could affect that logic? I've replaced it also.

FWIW Only cools when driving & then intermittently (comes on for a while then peters out vs. randomly) - this would seem to indicate enough moving air without the aux fan allowing it to engage compressor, but not the intermittent behavior. Granted the intermittent could be a separate [compressor] problem, but... no code to point me there vs. the one code I do get.
When you replaced the control panel module, did you code the new panel to the car? Some modules requires coding to the car to make it operational. Another BMW great idea to prevent people from just swapping in parts. Just like the Battery that needs to be coded to the car for them to work properly.

Glad I'm no longer a BMW owner.
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  #23  
Old 06-30-2020, 07:46 PM
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Quote:
Originally Posted by upallnight View Post
When you replaced the control panel module, did you code the new panel to the car? Some modules requires coding to the car to make it operational. Another BMW great idea to prevent people from just swapping in parts. Just like the Battery that needs to be coded to the car for them to work properly.
No...didn't think/know that's a thing for the E53 like it is the E70. Haven't seen any references to that in my research & the tool didn't seem to have similar options to the E70. All the functionality of the panel seems to be there/appropriate, just can't 100% say it's really sending the signal.
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  #24  
Old 06-30-2020, 07:58 PM
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Originally Posted by 80stech View Post
Again, the DME won't engage the compressor if it thinks there is a problem with AUX fan, using the scan tool to turn on the compressor by-passes that feature. The aux fan does not engage the compressor, the DME does.
That confirms my understanding

Quote:
Originally Posted by 80stech View Post
Knowing if the compressor clutch is not engaging when there is no cooling is much more helpful than knowing the clutch is engaged when it is cooling. If you don't have cooling or clutch engaging when the car is idling, work with that and the aux fan code that you have, especially since you already had the system checked, evacuated and recharged by someone that has guages.
Yep, and completely out of ideas as to why the DME can't activate the fan when the tool can. I appreciate the help, just don't know how to move forward.
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'05 X5 3.0i - Recently acquired for wife & daughter
'03 X5 3.0i - lots of upgrades, passed to son // '98 540i - other son's
'94 E36 318ic - son's wrecked // '96 E36 328ic - son's sold
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  #25  
Old 06-30-2020, 10:07 PM
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I would still have another look at the clutch and try to nudge it a bit or check the voltage at it when it should be working and when it is working. I know you checked already but maybe check if there is a problem with the low or high pressure switches. You should be able to get an evap temp reading with your scan tool as well. And maybe just concentrate on finding what it causing the aux fan code and don't think so much about the A/C.
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  #26  
Old 07-01-2020, 10:41 AM
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I had the same intermittent issue for a year. Except when I bought my E53 it had Both passenger side tires blown out That shredded and ripped the wiring harness coming from the DME, yikes! There were a lot of electrical shorts and melted wires fused together. I had to change the DME and trace the fused wires all the way to the fuse box under the dash. I totally rebuild my AC system from The engine bay to the cabin. My AC system is now working "in part" only because I bypassed the pressure AC Pressure sensor black signal wire. To make a long story short, what I did was Connected the black Pressure sensor wire coming from the DME to the black radiator temperature sensor Wire and I my auxiliary fan and Ac compressor works. Only the drawback to this is the Aux fan will only spin at moderate speed which won't move a lot of air across your condenser when Ambient temperatures Are above 92 degrees while sitting in traffic.
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  #27  
Old 07-01-2020, 02:16 PM
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If you can command on compressor with the tool, you should be able to see the evaporator temp drop to confirm its working. It feels like safety is intermittent disable eg loose or short wire from pressure switch.

Unfortunately the pressure switch is not a simple yes no two wire switch So maybe you need to measure the voltage and compare to a working car
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  #28  
Old 07-01-2020, 04:19 PM
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The voltage is correct 5V on the multimeter
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  #29  
Old 07-01-2020, 05:47 PM
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There are three pins on the pressure sensor


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  #30  
Old 07-01-2020, 07:07 PM
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Quote:
Originally Posted by Bimmer876 View Post
...I totally rebuild my AC system from The engine bay to the cabin. My AC system is now working "in part" only because I bypassed the pressure AC Pressure sensor black signal wire. To make a long story short, what I did was Connected the black Pressure sensor wire coming from the DME to the black radiator temperature sensor Wire and I my auxiliary fan and Ac compressor works...
Yikes, not sure I would do that by choice, though I have replaced nearly everything on a Mini. Interesting tip though, tying the two sensors together.
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~~~~~~~~~
'10 X5 35D - Performance mods & Kassel tune // '04 Mini R53 - lots of mods, rebuilt // '03 Mini R53 - sold
'05 X5 3.0i - Recently acquired for wife & daughter
'03 X5 3.0i - lots of upgrades, passed to son // '98 540i - other son's
'94 E36 318ic - son's wrecked // '96 E36 328ic - son's sold
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