BMW E39 Climate control problem
Discussion
Hello
I have a 2000 E39 540I Touring and have an issue with the climate control, when stationary everything works as it should you are able to change the temperature and fan speed and turn air con on and off but as soon as i'm driving it will have a mind of it's own changing the temp/fan speed and once i turn the fan/unit off it keeps blowing. The final stage unit has been replaced as that's what i read is the first go to part/problem but still the problem sticks?
Appreciate any help thanks.
I have a 2000 E39 540I Touring and have an issue with the climate control, when stationary everything works as it should you are able to change the temperature and fan speed and turn air con on and off but as soon as i'm driving it will have a mind of it's own changing the temp/fan speed and once i turn the fan/unit off it keeps blowing. The final stage unit has been replaced as that's what i read is the first go to part/problem but still the problem sticks?
Appreciate any help thanks.
That's an old style used one you've referenced in your post. I had endless trouble with cheap (new!) FSUs. Bought at least 4 in the past few years for both my E39s - mainly cheap ones from eBay. Finally bit the bullet and bought a couple from a BMW dealer and now have obedient climate control and ventilation.
It's entirely possible your wayward climate control is misbehaving due to other issues but I'd start by fitting a new one from a reputable source. Better still, borrow one from someone who has a BMW with fully functional and reliable CC (with the same part number for the FSU - look at Realoem for applications). That way you can confirm or rule out a dodgy FSU. It's a 10 minute job to remove it from the car although it is a bit awkward!
It's entirely possible your wayward climate control is misbehaving due to other issues but I'd start by fitting a new one from a reputable source. Better still, borrow one from someone who has a BMW with fully functional and reliable CC (with the same part number for the FSU - look at Realoem for applications). That way you can confirm or rule out a dodgy FSU. It's a 10 minute job to remove it from the car although it is a bit awkward!
Depthhoar said:
That's an old style used one you've referenced in your post. I had endless trouble with cheap (new!) FSUs. Bought at least 4 in the past few years for both my E39s - mainly cheap ones from eBay. Finally bit the bullet and bought a couple from a BMW dealer and now have obedient climate control and ventilation.
It's entirely possible your wayward climate control is misbehaving due to other issues but I'd start by fitting a new one from a reputable source. Better still, borrow one from someone who has a BMW with fully functional and reliable CC (with the same part number for the FSU - look at Realoem for applications). That way you can confirm or rule out a dodgy FSU. It's a 10 minute job to remove it from the car although it is a bit awkward!
Thanks for your advice will try that first, i removed the climate control unit and put it back in again and it didn't seem to be doing it but will wait and see and will consider getting a decent FSU, luckily i picked this car up for £500 and this was one of the two issues i've had with it so it isn't breaking the bank. It's entirely possible your wayward climate control is misbehaving due to other issues but I'd start by fitting a new one from a reputable source. Better still, borrow one from someone who has a BMW with fully functional and reliable CC (with the same part number for the FSU - look at Realoem for applications). That way you can confirm or rule out a dodgy FSU. It's a 10 minute job to remove it from the car although it is a bit awkward!
Depthhoar said:
That's an old style used one you've referenced in your post. I had endless trouble with cheap (new!) FSUs. Bought at least 4 in the past few years for both my E39s - mainly cheap ones from eBay. Finally bit the bullet and bought a couple from a BMW dealer and now have obedient climate control and ventilation.
It's entirely possible your wayward climate control is misbehaving due to other issues but I'd start by fitting a new one from a reputable source. Better still, borrow one from someone who has a BMW with fully functional and reliable CC (with the same part number for the FSU - look at Realoem for applications). That way you can confirm or rule out a dodgy FSU. It's a 10 minute job to remove it from the car although it is a bit awkward!
Don't suppose you know what causes steering wheel shaking under breaking from over 60? I have read a few forums and they are suggesting it's the track rod ends. It's entirely possible your wayward climate control is misbehaving due to other issues but I'd start by fitting a new one from a reputable source. Better still, borrow one from someone who has a BMW with fully functional and reliable CC (with the same part number for the FSU - look at Realoem for applications). That way you can confirm or rule out a dodgy FSU. It's a 10 minute job to remove it from the car although it is a bit awkward!
Might not be your brakes juddering.....but read on.
Could be a number of single issues, or a combination of them.
Common culprit are the front control arms (there are two on each side), usually the bent ones. Some just replace the bush on one end of it but if the bush is shot the ball joint on the other end of it is probably done for too. Wear (creating judder and/or shimmy) doesn't show up easily using the usual pry bar test. Many garage techs will pass these components as 'OK' when in fact they are worn enough to induce the symptoms. The straight control arm can also be troublesome but less so than the one above.
Don't rule out worn drop links, wheel bearings and top mounts.
Brake disc runout and pad transfer are others to consider. (I had measurable pad transfer problems on both my E39 M5 and E39 530d resulting in judder during braking within the last year).
Check wheel balance too.
Some E39 owners never get to the bottom of brake judder problems, or speed related 'shimmy' issues for that matter.
Heard the saying, 'There's no such thing as a cheap BMW E39' ?
(Edit: Just seen that you have a V8 so you'll need to check for wear on the inner tie rod joints. Heat from the nearby exhaust can cook the joints and hasten wear.)
Could be a number of single issues, or a combination of them.
Common culprit are the front control arms (there are two on each side), usually the bent ones. Some just replace the bush on one end of it but if the bush is shot the ball joint on the other end of it is probably done for too. Wear (creating judder and/or shimmy) doesn't show up easily using the usual pry bar test. Many garage techs will pass these components as 'OK' when in fact they are worn enough to induce the symptoms. The straight control arm can also be troublesome but less so than the one above.
Don't rule out worn drop links, wheel bearings and top mounts.
Brake disc runout and pad transfer are others to consider. (I had measurable pad transfer problems on both my E39 M5 and E39 530d resulting in judder during braking within the last year).
Check wheel balance too.
Some E39 owners never get to the bottom of brake judder problems, or speed related 'shimmy' issues for that matter.
Heard the saying, 'There's no such thing as a cheap BMW E39' ?
(Edit: Just seen that you have a V8 so you'll need to check for wear on the inner tie rod joints. Heat from the nearby exhaust can cook the joints and hasten wear.)
Edited by Depthhoar on Sunday 22 July 23:37
Edited by Depthhoar on Monday 23 July 14:14
Depthhoar said:
Might not be your brakes juddering.....but read on.
Could be a number of single issues, or a combination of them.
Common culprit are the front control arms (there are two on each side), usually the bent ones. Some just replace the bush on one end of it but if the bush is shot the ball joint on the other end of it is probably done for too. Wear creating judder and/or shimmy doesn't show up easily using the usual pry bar test. Many garage techs will pass these components as 'OK' when in fact they are worn enough to induce the symptoms. The straight control arm can also be troublesome but less so than the one above.
Don't rule out worn drop links, wheel bearings and top mounts.
Brake disc runout and pad transfer are others to consider. (I had measurable pad transfer problems on both my E39 M5 and E39 530d resulting in judder during braking within the last year).
Check wheel balance too.
Some E39 owners never get to the bottom of brake judder problems, or speed related 'shimmy' issues for that matter.
Heard the saying, 'There's no such thing as a cheap BMW E39' ?
(Edit: Just seen that you have a V8 so you'll need to check for wear on the inner tie rod joints. Heat from the nearby exhaust can cook the joints and hasten wear.)
Thanks a lot for the advice, don't know where to start really Could be a number of single issues, or a combination of them.
Common culprit are the front control arms (there are two on each side), usually the bent ones. Some just replace the bush on one end of it but if the bush is shot the ball joint on the other end of it is probably done for too. Wear creating judder and/or shimmy doesn't show up easily using the usual pry bar test. Many garage techs will pass these components as 'OK' when in fact they are worn enough to induce the symptoms. The straight control arm can also be troublesome but less so than the one above.
Don't rule out worn drop links, wheel bearings and top mounts.
Brake disc runout and pad transfer are others to consider. (I had measurable pad transfer problems on both my E39 M5 and E39 530d resulting in judder during braking within the last year).
Check wheel balance too.
Some E39 owners never get to the bottom of brake judder problems, or speed related 'shimmy' issues for that matter.
Heard the saying, 'There's no such thing as a cheap BMW E39' ?
(Edit: Just seen that you have a V8 so you'll need to check for wear on the inner tie rod joints. Heat from the nearby exhaust can cook the joints and hasten wear.)
Edited by Depthhoar on Sunday 22 July 23:37
looking at the last MOT these popped up as advisories Advisory notice item(s)
Power steering component(s) has slight seepage from a component (2.3.3b) (think i sorted this)
Oil leak () (rocker cover gasket possibly)
Offside Rear Brake pipe slightly corroded (3.6.B.2c)
Nearside Front Anti-roll bar linkage ball joint dust cover damaged, but preventing the ingress of dirt (2.4.G.2)
Edited by 83HP on Monday 23 July 13:31
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