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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 11-23-2010, 11:43 PM
IMa530 IMa530 is offline
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Question 530i no power goin to A/C compressor, dont know what else to try.

Hi all!

In my 530i, 03 model, M54 engine the A/C is blowing only hot air so i checked the compressor and, the pulley its spinning when engine is on but the clutch plate at the front of compressor stands still.

So i checked fuses, relay under the hood and all working fine. when i press the snow flake button the green light turns on but the compressor does not engage. all settings are set for cold.

I had the system checked by a specialist and said that there is plenty of gas in there, pressure is good and all. Then i went to an auto electrician which scanned for trouble codes and found nothing wrong. Then he checked the compressor and came back with the verdict no power going there.

But all wires seem fine from what i can see. Really desperate to fix this because i live in Australia and summer is already here and i dont know waht else to do except take it to a dealer and be skinned alive for it. If u think dealerships in USA charge you an arm and a leg down under they are not satisfied until you have no more limbs.

So in sumary:

- Fuses check.
- Relay check.
- System at correct pressure with plenty of gas.
- All inside settings set for cold.
- No trouble codes.
- Specialist said nopower geting to the compressor.

I read a few threads but seems that the general advice is refill at proper level etc.
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  #2  
Old 11-24-2010, 06:29 AM
pleiades pleiades is offline
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You checked all fuses in the front ("roof" of glove compartment) and rear (in trunk, over the battery)?

You set the dial wheel on the central console duct to the "blue" dot?

If yes on those and still no luck, hopefully one of the AC wizards will weigh in soon.
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  #3  
Old 11-24-2010, 07:14 AM
Rjim Rjim is offline
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Did you also check fuse #75 forward of the glove compartment? It's very tough to get to, maybe because it's never supposed to fail.
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  #4  
Old 11-24-2010, 07:30 AM
cn90 cn90 is offline
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Assuming you have proper R134a level, the causes of non-engaging AC Clutch are:
1- Bad AC Clutch itself.
2- Bad relay
3- Bad HVAC Panel (in the cabin)
4- ? Bad FSR

Easiest is to find a compatible car and swap items #2, 3 and 4 and report back.

PS: Fuse #75 controls the Aux Fan and has nothing to do with the AC Clutch electromechanical device.

Last edited by cn90; 11-24-2010 at 07:40 AM.
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  #5  
Old 11-24-2010, 12:52 PM
Rjim Rjim is offline
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Quote:
Originally Posted by cn90 View Post
Assuming you have proper R134a level, the causes of non-engaging AC Clutch are:
1- Bad AC Clutch itself.
2- Bad relay
3- Bad HVAC Panel (in the cabin)
4- ? Bad FSR

Easiest is to find a compatible car and swap items #2, 3 and 4 and report back.

PS: Fuse #75 controls the Aux Fan and has nothing to do with the AC Clutch electromechanical device.
Fuse #75 does indeed control the aux fan, but with that fuse removed, the A/C will pump only warm air.
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  #6  
Old 11-24-2010, 06:01 PM
poolman poolman is offline
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Is there a fuse right at the compressor--the wire may be corroded --check and see if your getting power that
far along--
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  #7  
Old 11-24-2010, 07:08 PM
cn90 cn90 is offline
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Review the following diagram:

1. The HVAC Control Module sends a signal to the AC Clutch when told to do so.

2. However, the pressure switch is connected in series, this means too low or too high pressure of R134a will not allow the AC Clutch to engage.
Did your mechanic over-charged the R134a?

3. Check all fuses as mentioned previously.

4. Last check is the HVAC module.

Again, best is you have a buddy with similar car so you can swap these items for free!

PS: Fuse 75 controls the Electric Aux Fan. With Fuse 75, Aux fan runs correctly. Without Fuse 75, Aux fan not running, engine may overheat during extreme days like >100F.
But the lack of Fuse 75 will not disable the AC Clutch.

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Last edited by cn90; 11-24-2010 at 07:10 PM.
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  #8  
Old 11-25-2010, 06:01 AM
IMa530 IMa530 is offline
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Thanks for all your replys, been really busy the last couple of days had no time for net or car, but tomorrow i will definitely be looking into it following each advise and report back.

The pressure is at correct levels according to the A/C specialist.

Poolman, that fuse you are talkin about is that like a single black wire with a cilynder plug at the end ? Because the auto electrician guy stuck the tip of a voltmeter tool through the wire about half way and thats when he said there is no power going to compressor.
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  #9  
Old 11-25-2010, 06:52 AM
poolman poolman is offline
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Thats the one--CNN has given the best advise---hope you find the problem
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  #10  
Old 11-25-2010, 07:00 AM
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QSilver7 QSilver7 is offline
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If I'm not mistaken...the e39's HVAC system is very similar to the e38...perhaps something can be gained from the information below. The E38's HVAC system was a movement away from the systems used in the e32/e34/e31/e24...and many of the features mentioned below were incorporated into the e39 & e46 when they debuted:



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Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
(SOLD)
99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

http://imageshack.com/scaled/grid240/822/e38e532ndsigpic.jpg

Last edited by QSilver7; 11-25-2010 at 07:03 AM.
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  #11  
Old 11-25-2010, 08:09 AM
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flyboyy flyboyy is offline
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Quote:
Originally Posted by IMa530 View Post
Hi all!

In my 530i, 03 model, M54 engine the A/C is blowing only hot air so i checked the compressor and, the pulley its spinning when engine is on but the clutch plate at the front of compressor stands still.

So i checked fuses, relay under the hood and all working fine. when i press the snow flake button the green light turns on but the compressor does not engage. all settings are set for cold.

I had the system checked by a specialist and said that there is plenty of gas in there, pressure is good and all. Then i went to an auto electrician which scanned for trouble codes and found nothing wrong. Then he checked the compressor and came back with the verdict no power going there.

But all wires seem fine from what i can see. Really desperate to fix this because i live in Australia and summer is already here and i dont know waht else to do except take it to a dealer and be skinned alive for it. If u think dealerships in USA charge you an arm and a leg down under they are not satisfied until you have no more limbs.

So in sumary:

- Fuses check.
- Relay check.
- System at correct pressure with plenty of gas.
- All inside settings set for cold.
- No trouble codes.
- Specialist said nopower geting to the compressor.

I read a few threads but seems that the general advice is refill at proper level etc.
I had a very similar issue and I did not see you check your... AUX FAN,, if your AC is turned on... your AUX fan must turn on as welll.. if AUX fan does not turn on.. then the compressor does not either.... and therefore you have no AC... my connectors to the aux fan was corroded in the front near the grill... area.. and what they did was.. re-did the connections to my aux fan and bam..... my AC started working and compressor kicked on.... so check that out.
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  #12  
Old 11-26-2010, 01:38 AM
IMa530 IMa530 is offline
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Ok, today i started checking everything again:

- Inside all settings set for cold, yes little wheel showing 3 blu dots.
- Fuses in the glove box look all good none with melted or burned whire. (Can not locate #75)
- Aux fan spins normally.
- Checked that black wire that goes into the compressor which then disapears into a bigger bunch of wires and no signs of corrosion or damage.
- Open again the relay box under the hood and checked all the relays in there (no diagram that shows which one is for A/C).

Now cn90 and QSilver7 have advised to check HVAC control module, but before i go ahead and take it out what exactly am i looking for? I am supposing i do need to take it out. All buttons do work though.

Another question is that i checked the relays by shaking them, a mate of mine said that if they rattle the armour inside is broken, but i read on the net that is not the best way to check and i am supposed connect the plus and minus on the realy to the battery and if it makes a noise like clicking that means realy is ok.

Now does anybody know which one is the exact relay? there is a blue a green and a big brown one and how should i check it properly. no other friends that drives a bmw for me to swap.
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  #13  
Old 11-26-2010, 08:12 AM
cn90 cn90 is offline
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FYI,

1. The Electronic Box on the passenger side (USA model) contains the following items: ECU, TCU, wiper relays, Aux Fan relay etc. but not AC Clutch fuse/relay.
As QSilver7 pointed out above, no relay for AC Clutch.
See pic below for E-box layout (I took that pic from my other posts on wiper relay).

2. Check your Fuse #75/76 though. Search forum for exact location. Basically in the glovebox area.


Last edited by cn90; 11-26-2010 at 08:14 AM.
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  #14  
Old 11-26-2010, 03:56 PM
IMa530 IMa530 is offline
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cn90 My electronic box only has three relays, the two up top and the bigger one the brown one at the bottom, but mine is more towards the left. Then has another three relays where the fuses are in the rear of the car above the battery.

I will look again for #75 and #76 though i looked all over the glove box. But my aux fan is working so is there a point checking them? i will anyway.

Thanks, for clearing that relay issue with me because i really thought i had a relay problem and as it turns out i have no relay at all for my A/C clutch. I sholud have understood that from qsilver7's diagram but i just didn't click at the time.

Well now all its left to do is take out the HVAC control module and check that all wires are good. I will report on that later on.
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  #15  
Old 11-26-2010, 07:06 PM
cn90 cn90 is offline
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What is the Ambient Temp display on your dash, is it -40C?
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  #16  
Old 11-26-2010, 07:43 PM
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16valex 16valex is offline
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Your problem could be simple as a bad connection to the aux fan as mentioned earlier by Flyboyy. Or, could just be a bad aux fan. I know for a fact on later years cars, if your aux fan is bad, there will be no power to the compressor, you can read the codes and it will tell you if you have a bad aux fan or not.

Last edited by 16valex; 11-26-2010 at 08:27 PM.
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  #17  
Old 11-26-2010, 08:25 PM
IMa530 IMa530 is offline
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cn90, my dash shows the correct temp.

16valex, as i mentioned in my starting post after scaning no trouble codes were showing and my aux fan seems to run normal, how can i tell if i have a bad one. Is there a visible connection between aux fan and compressor that i can check?
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  #18  
Old 11-26-2010, 08:38 PM
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16valex 16valex is offline
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Quote:
Originally Posted by IMa530 View Post
cn90, my dash shows the correct temp.

16valex, as i mentioned in my starting post after scaning no trouble codes were showing and my aux fan seems to run normal, how can i tell if i have a bad one. Is there a visible connection between aux fan and compressor that i can check?
There're only two logics that the aux fan would kick in.
1/ A/C is ON. But your compressor has no power so it can't be from A/C.
2/ Cooling temperatures reaches at a certain point very high though. Did you watch the aux fan spinning under it's own power?

If you are sure that your aux fan is running fine, then I would suggest to by pass the pressure sensor to see if the compressor kick in or not. How? ( short out the sensor where the dryer is)
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Old 11-26-2010, 10:19 PM
IMa530 IMa530 is offline
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16valex sorry these questions might sound stupid, but i have no knowledege about A/C system and never really understood electrics.

Is this sensor on the compressor? i checked the forum but hardly found anything. If i understood correct i need to bypass this sensor and if A/C kicks in then sensor is at fault.

If it is on the compressor does that mean that if taken out freon will come out?
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Old 11-27-2010, 06:55 AM
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16valex 16valex is offline
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Quote:
Originally Posted by IMa530 View Post
16valex sorry these questions might sound stupid, but i have no knowledege about A/C system and never really understood electrics.

Is this sensor on the compressor? i checked the forum but hardly found anything. If i understood correct i need to bypass this sensor and if A/C kicks in then sensor is at fault.

If it is on the compressor does that mean that if taken out freon will come out?
Ima530,

Here are some pix for you.
The first picture is your pressure switch for your A/C. It's located under your right headlight.
The second picture is the location of the plug to your aux fan. Check this plug for corrosions.
I think you should find an A/C expert.
You still haven't convinced me that your aux fan is really working.
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  #21  
Old 11-27-2010, 11:06 AM
cn90 cn90 is offline
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Quote:
Originally Posted by IMa530 View Post
[... but i have no knowledege about A/C system and never really understood electrics...
AC system trouble-shooting is no joke, even for seasoned mechanics! My suggestions are:

1. Get an HVAC book to educate yourself how a car AC system works. Actually it is simple if you understand how a fridge at home works.

2. Then:
- Make absolutely sure your R134a level is correct. when in doubt, go to BMW dealer and ask a tech there for assistance such as specifications. Write it down and save it and share it with your mechanic.
- Another option is swapping HVAC panel, it is a very easy thing to do if you have a buddy "donor".
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Old 11-27-2010, 07:43 PM
IMa530 IMa530 is offline
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Thanks for the advise guys.

Yesterday i had the HVAC panel out, checked all wires and they looked good no signs of corrosion, melting etc, main plug looks good no rust just bit of dust around the whole unit. i even opened the panel to clean the little magnetic rotor (found the DIY for it in this forum). Put it back on. No other friend drives a BMW so a swap its hard to find.

As for the R134 for level im sure the A/C gus knew what he was talkin about, he is part of a bigger shop called southernbm they specialise in bmw but just as expensive as dealership thats why i pulled back after just the diagnosis and thought to tackle it myself before i leave may next paycheck to this guys.
My car has hit the 200k mark in KM's and i have changed all tensioner pulleys, belt, the water pump (flushed whole system) and steering pump, changed oil and spark plugs, hell i'll even do the vanos seal soon (done it before on my Holden GM) but this time i think im out of my league, this is as deep as i go, to much electricity for me.

I will take it for a professional repair and report back where the fault was.
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  #23  
Old 11-30-2010, 05:59 AM
IMa530 IMa530 is offline
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16valex, i owe you a beer mate, when u come down under let me know

That aux fan plug wasn't pushed in properly, i was checking it and visualy it looked ok bu then i thought ill disconnect it and check for corrosion inside following your advise, so when i was goin to unplug it, it just came of very easy, thats not normal i thought, pushed it back in i made sure i heard it click. Cranked the girl up, pushed the snow flake button and i had a look at the clutch and within seconds kicked in, cold air followed.

cn90 and Qsilver7 thankyou for your help too, i learned a few things about my A/C and HVAC.
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  #24  
Old 11-30-2010, 06:28 AM
cn90 cn90 is offline
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When are you buy tickets for 16valex, myself and QSilver7 to Australia?
I want to visit Sydney.
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  #25  
Old 11-30-2010, 06:32 AM
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16valex 16valex is offline
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Quote:
Originally Posted by IMa530 View Post
16valex, i owe you a beer mate, when u come down under let me know

That aux fan plug wasn't pushed in properly, i was checking it and visualy it looked ok bu then i thought ill disconnect it and check for corrosion inside following your advise, so when i was goin to unplug it, it just came of very easy, thats not normal i thought, pushed it back in i made sure i heard it click. Cranked the girl up, pushed the snow flake button and i had a look at the clutch and within seconds kicked in, cold air followed.

cn90 and Qsilver7 thankyou for your help too, i learned a few things about my A/C and HVAC.
That's awesome! Happy to hear your good news!
BTW, are you gonna throw a shrimp on the barbee with that beer too?
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