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-   -   AC not working 2001 X5 (http://www.bimmerfest.com/forums/showthread.php?t=697792)

David Covell 05-21-2013 01:07 PM

AC not working 2001 X5
 
Looked through the blogs and did not appear to find my exact situation. AC stopped working after reliably producing 40F at the vents. Pressure test indicated 115 psi, so 134a does not appear to be low. AC belt is fine, but clutch does not engage. Since all fans work, I do not believe is is a Final Stage Resistor. Suspect other relay/fuse. Does anyone know how to trigger the AC clutch to check for a failed relay/fuse?

Thanks for the advice.

upallnight 05-21-2013 02:44 PM

AC clutch is triggered by the DME. Does the aux fan in front of the radiator come on? Do you have a scanner for scanning for faults? I had a bad aux fan and the compressor wouldn't engaged. Scanned the X with my scanners (carsoft 6.5 and BMW Scanner 1.4) and they both indicated a bad fan. Replaced the fan and the AC is working again, just in time for summer.

Good Luck with your AC problem.

Zulu95 05-21-2013 04:36 PM

I just got my X back today from the indy after having a new Aux fan installed. Old unit was doing the now it works, now it does not for the last few weeks. i ordered the replacement fan from an online source and it was broken when it arrived so I had to wait for the second unit to be sent out.
Now I'm back to frigid air blowing from the vents.

David Covell 05-25-2013 01:05 PM

update on ac
 
Ac still not working. Here's my checklist:

1. double checked ac fuses (34,48) O.K.

2. aux fan begins to spin with +12 volts across terminals. Does anyone know know which pins to check for signal to fan at the connector. With car running, don't get any voltage across any of the three pairs with ac on. Help on wiring would be great.

3. unplugged ac high pressure switch. blog suggested this should trigger compressor clutch. no effect. Alternatively, blog suggests jumping leads to engage compressor clutch. There are 3 wires black-grey, yellow-green and brown. Anyone know which to jump? Also, if this switch is bad, is there a valve at this port, as with the high and low pressure service ports, so I can remove switch w/o removing 134a.

4. wired into the circuit is a temperature switch on the low port to the radiator. Don't see how this might be a problem. Does anyonbe know how to check?
5. double checked 134a pressure. still at 115psi.

Beginning to suspect temperature sensor in passenger compartment. Sometime I could hear a slight clicking when cabin temperature close to set value. Don't know how to get to where this might be.

Thanks for any help.

upallnight 05-25-2013 03:49 PM

Quote:

Originally Posted by David Covell (Post 7609736)
Ac still not working. Here's my checklist:

1. double checked ac fuses (34,48) O.K.

2. aux fan begins to spin with +12 volts across terminals. Does anyone know know which pins to check for signal to fan at the connector. With car running, don't get any voltage across any of the three pairs with ac on. Help on wiring would be great.

3. unplugged ac high pressure switch. blog suggested this should trigger compressor clutch. no effect. Alternatively, blog suggests jumping leads to engage compressor clutch. There are 3 wires black-grey, yellow-green and brown. Anyone know which to jump? Also, if this switch is bad, is there a valve at this port, as with the high and low pressure service ports, so I can remove switch w/o removing 134a.

4. wired into the circuit is a temperature switch on the low port to the radiator. Don't see how this might be a problem. Does anyonbe know how to check?
5. double checked 134a pressure. still at 115psi.

Beginning to suspect temperature sensor in passenger compartment. Sometime I could hear a slight clicking when cabin temperature close to set value. Don't know how to get to where this might be.

Thanks for any help.

The BIG 50 amp fuse behind the glove box is blown since you don't have voltage at the connector. The fuse is hot at all time. The two thick wires at the connector is + and -. The thin wire is the signal wire from the DME to pulse the fan. Only way that 50 amp fuse would blow is if the fan is bad. Even with 12 volts across the terminal the fan will not spin until it receive a ground signal from the DME. Like I said if you have a scanner that can scan the BMW HVAC modules you can verify if the fan is good or bad.

Check this post out:

http://www.xoutpost.com/bmw-sav-foru...tml#post934471

Zulu95 05-26-2013 12:15 PM

"2. aux fan begins to spin with +12 volts across terminals. "

Change the fan as it should spin up and keep running. They only cost $135 but the labor to drop the front bumper will bump that up.
GL.

lahermano 05-30-2013 09:22 PM

where did u get the fan for $135 ??
please send me the details so i can buy too.

Zulu95 05-31-2013 07:22 AM

PM sent.

David Covell 06-08-2013 01:22 PM

new fan doesn't solve problem
 
Replacedaux fan today. Not a big job. Still no ac. Before I make my next step, I would like to ask where to find the 50 amp fuse behind the glove box. Looked into the courtesy light area, where there is a pull down panel, but no fuse. Fuse box has 50 amp fuses, but all look good. Engine compartment at glove box location has no fuses.

Can someone identify where this 50 amp fuse is??

Thanks,\
David

upallnight 06-08-2013 05:20 PM

Quote:

Originally Posted by David Covell (Post 7639258)
Replacedaux fan today. Not a big job. Still no ac. Before I make my next step, I would like to ask where to find the 50 amp fuse behind the glove box. Looked into the courtesy light area, where there is a pull down panel, but no fuse. Fuse box has 50 amp fuses, but all look good. Engine compartment at glove box location has no fuses.

Can someone identify where this 50 amp fuse is??

Thanks,\
David

Did you test to confirm that the fuse has power to them? The 50 amp fuse is right behind the glove box behind the pull down panel.

Did you test to see if you have power at the fan connector?

There is a spare 50 amp fuse also in that panel so it will not have current since it is not connected.


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