Hi Guys,
My 2007 2.5i Z4 Sport's heater (with auto air con) stays hot (max hot) regardless of whether the temperature dial is set to cold or any other position.
Before this happened the heater fan would cut out from time to time but come back on of its own accord.
I've tried wiggling the wires at the back of the controls to no avail, and the connections all seem tight.
I'm suspecting that the heater control / contol module (containing three control knobs and various buttons) is faulty. There is one for sale on ebay which looks the same -
http://www.ebay.co.uk/itm/BMW-Z4-06-09- ... 2156859830[/url]
But I'm not sure whether the fault lies with this component.
If it does, the centre dash vent and radio have to come out to be able to fit it apparently.
Any advice from someone who has heard of / experienced the same problem ( and got it fixed!) would be much appreciated, as would advice on how to get the centre vent and radio out and whether a replacement heater control / module needs to be coded by a dealer or specialist to suit the car. The following BMW info on the heating system vaguely suggests it may need coding -
http://www.bmwclub.lv/files/07_E85_Heat ... r_Cond.pdf
Not joined yet? Register for free and enjoy features such as alerts, private messaging and viewing latest posts and topics.
E85 Heater Stuck On Hot!
- markplant
- Lifer
- Posts: 3678
- Joined: Mon Jul 21, 2014 8:16 pm
- Location: Sheffield
E85 Heater Stuck On Hot!
Look up heater resistor, I think when that goes it is has that effect
3.0 Manual. Sterling Grey. Cream leather Electric an Heated. Professional Navigation/Sony tablet replacement. Storm Werks . an parts waiting to be fitted
-
- Member
- Posts: 100
- Joined: Mon Nov 14, 2016 10:18 am
E85 Heater Stuck On Hot!
Thanks very much for your advice but I think all the resistor does is control the fan speed and the fan is actiually working OK on all speeds.
Has anyone had the heater stuck on hot regardless of temperature setting?
Has anyone had the heater stuck on hot regardless of temperature setting?
-
- Member
- Posts: 270
- Joined: Mon Apr 25, 2011 10:14 am
E85 Heater Stuck On Hot!
No idea how it works on these cars, but on previous cars I've had that have had a similar fault there is a dedicated heater valve which directs or diverts hot engine coolant into the heat exchanger unit. So it might be the controller that tells the valve to move or the valve itself, if thats how it works
E85 3.0l i Roadster - Titan Silver
-
- Member
- Posts: 100
- Joined: Mon Nov 14, 2016 10:18 am
E85 Heater Stuck On Hot!
Hi Marc-j, Thanks very much for your reply. It could be the valve as you say (its got one somewhere under the dash). But then again it could be the control module.
I've now noticed that the air is only coming out of the vents at the top of the dash regardless of the chosen settings.
Have booked the car in with Martin Wright (a local specialist) for diagnosis. He said that the control module has gone into default mode -apparently in this mode the system has sensed a defect and so blows air at the windscreen only to allow demisting (seems sensible).
He needs to check the car to find the reason.
I'll post an update when its been checked out and / or fixed.
I've now noticed that the air is only coming out of the vents at the top of the dash regardless of the chosen settings.
Have booked the car in with Martin Wright (a local specialist) for diagnosis. He said that the control module has gone into default mode -apparently in this mode the system has sensed a defect and so blows air at the windscreen only to allow demisting (seems sensible).
He needs to check the car to find the reason.
I'll post an update when its been checked out and / or fixed.
-
- Member
- Posts: 270
- Joined: Mon Apr 25, 2011 10:14 am
E85 Heater Stuck On Hot!
Good luck there's always lots of salvage parts on eBay if the new part is very expensive.
E85 3.0l i Roadster - Titan Silver
- Ewazix
- Lifer
- Posts: 4721
- Joined: Sun May 02, 2010 5:30 pm
- Location: Somerset
E85 Heater Stuck On Hot!
You sure it's not just in transport mode? If so it could be a fix with BMW coding. Maybe worth clarifying before parts start getting swapped at great expense.
see viewtopic.php?t=46716
see viewtopic.php?t=46716
2003 2.5 SE, low miles, Sterling Grey, 108's & Eagles, no stubby here! Unmolested.
2018 Cooper S Countryman
Fiesta Ecoboost
2018 Cooper S Countryman
Fiesta Ecoboost
-
- Member
- Posts: 100
- Joined: Mon Nov 14, 2016 10:18 am
E85 Heater Stuck On Hot!
Hi Guys, As a belated update and if it helps anyone else - I fixed the heater issue with a heater control panel from Ebay (comes complete with all the knobs and buttons). This turned out to be easy to fit after removal of the centre air vents which was the only tricky bit due to the 'invisible' spring clips inside the top of it.
The vents have to come out to get the radio /CD player out in order to access the two fixing screws on the top of the heater control panel that fasten it to the dash (along with side clips).
The heater control panel can then be squeezed out of the aperture below it after removal of a small cover between the centre console and the dashboard (the cover which has the audio input socket in it).
Great to see all the forum members and cars at Z Fest. Such a fanatastic day out, and I got my roof motor relocated whilst there by Mike (thanks mate!), so even more worthwhile.
The vents have to come out to get the radio /CD player out in order to access the two fixing screws on the top of the heater control panel that fasten it to the dash (along with side clips).
The heater control panel can then be squeezed out of the aperture below it after removal of a small cover between the centre console and the dashboard (the cover which has the audio input socket in it).
Great to see all the forum members and cars at Z Fest. Such a fanatastic day out, and I got my roof motor relocated whilst there by Mike (thanks mate!), so even more worthwhile.
- groovy_hippy
- Member
- Posts: 395
- Joined: Sun Mar 15, 2015 5:37 pm
- Location: Derby
E85 Heater Stuck On Hot!
Stick it to min and max a few times with 'auto' off. Mine was stuck on ice cold after it was regassed and this fixed it for me...
Current ... 2007 Z4 Coupe 3.0si Sport | Manual | Alpine White | Black leather | Piano black dash
Intro to Zeds, now sold... 2007 Z4 2.5i SE Roadster | Manual | Stratus Grey | Red Leather | CDV delete | DLV backbox
Intro to Zeds, now sold... 2007 Z4 2.5i SE Roadster | Manual | Stratus Grey | Red Leather | CDV delete | DLV backbox