Member Since: 14 Jul 2010
Location: Zealand
Posts: 37
Heater fan always on!
My D3 '05 just presented me with a new challenge.... The heater/ventilation fan is on all the time! I can turn the manual dial, and the led's indicate speed up and down, but no change in the actual fan speed. I can turn the fan off, by either turning dial completely down or pushing the OFF button.
Is it the blower control module (BCM) failing?
I've also done the HEVAC self-test without any luck.
note: I had the car washed yesterday, and its freezing outside (-10C)
/Jasper
4th Feb 2012 2:36 pm
Nightowl
Member Since: 14 Jul 2010
Location: Zealand
Posts: 37
Really.... Nobody??
C'mon guys i need some help with this one....
/Jasper
6th Feb 2012 12:06 pm
kiwirich
Member Since: 02 Oct 2011
Location: Sydney
Posts: 99
Could be a welded relay.........
Try a Hard reset & see if it's the control getting confused
Kiwirich
6th Feb 2012 10:05 pm
Nightowl
Member Since: 14 Jul 2010
Location: Zealand
Posts: 37
kiwirich wrote:
Could be a welded relay.........
Try a Hard reset & see if it's the control getting confused
Kiwirich
And by a hard reset you mean, disconnect the battery for 20mins and try again, or...?
8th Feb 2012 2:13 am
kiwirich
Member Since: 02 Oct 2011
Location: Sydney
Posts: 99
Hi Nightowl.
If you do a search...........
1. Turn off Car
2. Wait for Car to "go to Sleep"
3. Disconnect Battery leads Negative First
4.Cover Battery terminals with something Non-conductive EG old Towel
5.Join both Battery Leads together eg Use something metal spanner etc 30 seconds
6. Remove spanner thing
7. Remove Towel
8. Re-install Battery Leads Positive First
9. Restart Car
If this doesn't solve the issue, I'd be looking at pulling out the Fan Heater Relay & starting down that track....
Good luck
Kiwirich
8th Feb 2012 2:27 am
Nightowl
Member Since: 14 Jul 2010
Location: Zealand
Posts: 37
kiwirich wrote:
Hi Nightowl.
Good luck
Kiwirich
Ok, thanks for the guide-through....
Fan Heater relay...? But the fan can be turned both on and off just fine, its the variable speed control thats not working, hence my suspicion towards the Blower Control Module (BCM)....dosent that make sense?
/Jasper
8th Feb 2012 3:03 am
DALEK
Member Since: 28 Jul 2011
Location: Near Stockport
Posts: 633
I have the same problem on my D3 but its the rear fan!D3 HSE ........................Gone!!!
8th Feb 2012 6:37 am
kiwirich
Member Since: 02 Oct 2011
Location: Sydney
Posts: 99
Hi Jasper,
And now that I've read your post again.................Oooops
If the Hard reset doesn't fix it then I'd be looking at a trip to the (Stealer) ?? to get the Fault codes read & unit replacement from there.
Kiwirich
8th Feb 2012 8:55 am
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
Have you tried swapping the blower fan relay in the battery junction box with one with the same rating?Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 03 Feb 2006
Location: Blackpool where it does happen every night.
Posts: 433
Re: Heater fan always on!
Nightowl wrote:
My D3 '05 just presented me with a new challenge.... The heater/ventilation fan is on all the time! I can turn the manual dial, and the led's indicate speed up and down, but no change in the actual fan speed. I can turn the fan off, by either turning dial completely down or pushing the OFF button.
Is it the blower control module (BCM) failing?
I've also done the HEVAC self-test without any luck.
note: I had the car washed yesterday, and its freezing outside (-10C)
/Jasper
How do you do a HEVAC self test pleaseLandrover Discovery 3 TDV6 S 7 seat Automatic
Zambezi Silver my second love
12th Feb 2012 9:29 am
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
A few other threads on the HEVAC via the search:
Robbie wrote:
Ok, next step is the self test.
With ignition off press and hold the ECON & RECIRC buttons whilst turning ignition on (no need to start car).
The control module will then compare the current HEVAC actuator motor positions with the values stored in the module and will indicate an error by flashing the ECON LED.
If there are no errors, the LED will go out and the system will function normally.
To confirm that there are no errors, turn the ignition switch to the OFF position, then back to the ON position.
Observe the operation of the programmed defrost LED.
If there are errors present, the programmed defrost LED will flash and the system will attempt to calibrate itself.
Post results on here!
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 16 Jun 2010
Location: Yorkshire
Posts: 1020
Once you have done the self test try a relay swap. It worked for me.
12th Feb 2012 10:19 am
Nightowl
Member Since: 14 Jul 2010
Location: Zealand
Posts: 37
So, done the hard reset and the relay swap, but still no diffence....
When I turn the dial for manual setting, the led's follow, but the fan speed doesn't change. It seems it is always in some default mid setting, or off when the dial is turn all the way counter-clockwise.
How do I get access to the Blower Control Module, without taking too much apart...?
/jasper
17th Feb 2012 6:03 pm
Nightowl
Member Since: 14 Jul 2010
Location: Zealand
Posts: 37
Just replaced the Blower Control Module (BMC), which is basically a variable fan resistor... And that did the trick!
I took me just under 30mins and cost 90£ in spares...
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
