Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X5 (E53) Forum
Arnott
User Name
Password
Member List Premier Membership Search Today's Posts Mark Forums Read

Xoutpost server transfer and maintenance is occurring....
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management


Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 06-29-2020, 03:14 PM
Member
 
Join Date: Jun 2015
Location: Southern MD
Posts: 62
FellowsheepTech is on a distinguished road
Intermittent AC - out of ideas

Was sure I was going to be able to resolve this, but

Bought 2005 E53 3.0 used (144k mi) in March with known bad aux fan (would not command on with Schwabben/510 tool). Replaced the aux fan while I went through & changed fluids, plugs, filters, (complete cooling system refresh), etc.
- New fan will activate for 30 sec & shut off per tool command.
- Compressor will also activate for 30 sec & shut off per tool command.
- Had AC system vacuum tested & checked for proper capacity (i.e. no leaks)
- AC will not kick on or run cold while idling
- AC will sometimes run cold after driving a bit, then on & off
- Still getting code for DME: Activation electric fan (but can activate via tool)

Along the way, scoured many forum posts, YouTube clips etc. & replaced the following:
- Aux fan sensor switch (when I put the new fan in)
- HVAC control panel from Ebay (12 pin)
- evap temp sensor (original was corroded)
- blower motor resistor (while I was there)
- Have checked & swapped all fuses, including 60A on backside of glovebox fuse panel
- Have cleaned & reseated plugs on AC hi/low pressure switches

Never got ISTA to connect in spite of three load/configure attempts, so don't have much in the way of diagnostic data. This is particularly frustrating as I design/test/troubleshoot software for a living. Stopped short of buying another OBD2-USB cable & starting over.

I'm hesitant to hit a generic auto shop, as most don't seem to know these BMW systems well. Haven't found a great local shop & do almost all my own work. Was thinking of going to Kassel Performance in York, PA (great experience with my X35D tune, etc.) but they said they aren't AC experts.

I'm in Southern MD in the NCC & X chapters of BMW CCA
__________________
Chris

~~~~~~~~~
'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
Reply With Quote

Sponsored Links

  #2  
Old 06-29-2020, 04:00 PM
Member
 
Join Date: Mar 2016
Location: Saskatchewan Canada
Posts: 970
80stech is on a distinguished road
That sounds a lot like a problem with the variable displacement compressor. Maybe do some more investigation with that in mind and see what comes up. When you say will not "kick in" are you saying the compressor clutch will not engage at all when idling??
__________________
1988 325is (purchased new)
2004 X5 3.0 (new to me) 2005 X3 2.5 (new to wife)
Reply With Quote
  #3  
Old 06-29-2020, 05:44 PM
Member
 
Join Date: Jun 2015
Location: Southern MD
Posts: 62
FellowsheepTech is on a distinguished road
Quote:
Originally Posted by 80stech View Post
When you say will not "kick in" are you saying the compressor clutch will not engage at all when idling??
Yes, that's what I mean. It will engage when commanded to activate with the tool, so thought that would have ruled out clutch/compressor. Understand nothing is really ruled out until it's working, but...

Honestly, short of a functioning ISTA, don't know what/how to investigate further.
__________________
Chris

~~~~~~~~~
'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
Reply With Quote
  #4  
Old 06-29-2020, 06:15 PM
upallnight's Avatar
Member
 
Join Date: Aug 2012
Location: Cook County
Posts: 6,798
upallnight is on a distinguished road
Best way to determine the problem is to connect a set of gauges to the system. From that you can tell us what is the high side pressure, low side pressure and the ambient temperature these readings were taken. Anything else is just a guess. A good AC shop should be able to perform this if you don't have the gauges or lack the knowledge. You can command the th compressor to engage. If the pressures are not according to the pressure chart for the ambient temp that you have you found the problem. With a variable compressor even if the clutch is engaged it may not be pumping the refrigerant as intended.
__________________
2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD
Reply With Quote
  #5  
Old 06-29-2020, 06:15 PM
Member
 
Join Date: Mar 2016
Location: Saskatchewan Canada
Posts: 970
80stech is on a distinguished road
OK, I see you are still getting an aux fan code, that might be your best clue to follow. If you can get your codes and activate stuff with your hand-held tool then that should be good enough to diagnose although it still would be good for you to get ista or even better DIS up and running. Does the aux fan come on when you pull the connector on the fan sensor located on the lower rad hose?
__________________
1988 325is (purchased new)
2004 X5 3.0 (new to me) 2005 X3 2.5 (new to wife)
Reply With Quote
  #6  
Old 06-29-2020, 06:28 PM
Member
 
Join Date: Jun 2015
Location: Southern MD
Posts: 62
FellowsheepTech is on a distinguished road
Quote:
Originally Posted by 80stech View Post
Does the aux fan come on when you pull the connector on the fan sensor located on the lower rad hose?
Yes, it comes on then also
__________________
Chris

~~~~~~~~~
'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
Reply With Quote
  #7  
Old 06-29-2020, 06:35 PM
Member
 
Join Date: Mar 2016
Location: Saskatchewan Canada
Posts: 970
80stech is on a distinguished road
So you had the system evacuated and re-charged at a shop ?
__________________
1988 325is (purchased new)
2004 X5 3.0 (new to me) 2005 X3 2.5 (new to wife)
Reply With Quote
  #8  
Old 06-29-2020, 06:41 PM
Member
 
Join Date: Jun 2015
Location: Southern MD
Posts: 62
FellowsheepTech is on a distinguished road
Quote:
Originally Posted by 80stech View Post
So you had the system evacuated and re-charged at a shop ?
Yes, had been slightly overcharged, but no leaks & currently has correct charge.
__________________
Chris

~~~~~~~~~
'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
Reply With Quote
  #9  
Old 06-29-2020, 07:17 PM
Member
 
Join Date: Mar 2016
Location: Saskatchewan Canada
Posts: 970
80stech is on a distinguished road
I would double check that the compressor clutch is really not cutting in and then go down the path to find what is causing the aux fan code. Maybe check all fuses. Sometimes if the clutch is worn or the coil isn't getting quite enough power you can CAREFULLY nudge the front clutch plate with a hammer handle to get it to snap in.
__________________
1988 325is (purchased new)
2004 X5 3.0 (new to me) 2005 X3 2.5 (new to wife)
Reply With Quote
  #10  
Old 06-29-2020, 07:20 PM
Overboost's Avatar
//Binary is in my DNA
 
Join Date: Apr 2006
Location: Huntersville, NC
Posts: 2,593
Overboost is on a distinguished road
Quote:
Originally Posted by 80stech View Post
I would double check that the compressor clutch is really not cutting in and then go down the path to find what is causing the aux fan code. Maybe check all fuses. Sometimes if the clutch is worn or the coil isn't getting quite enough power you can CAREFULLY nudge the front clutch plate with a hammer handle to get it to snap in.
When my compressor clutch went, it left a compressor clutch fault. I am also thinking it has something to do with the variable displacement compressor.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On





All times are GMT -4. The time now is 02:09 AM.
vBulletin, Copyright 2020, Jelsoft Enterprises Ltd. SEO by vBSEO 3.6.0
2017 Xoutpost.com. All rights reserved. Xoutpost.com is a private enthusiast site not associated with BMW AG.
The BMW name, marks, M stripe logo, and Roundel logo as well as X3, X5 and X6 designations used in the pages of this Web Site are the property of BMW AG.
This web site is not sponsored or affiliated in any way with BMW AG or any of its subsidiaries.