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Erratic rear heater blower

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Author Post
hezekiel   
Fri Mar 16 2018, 06:32am
Joined: Mar 13 2018
Member No: #3469
Location: Next to Santa
Hi all,

My 2006 3.0 Exclusive has a habit of changing the speed of the rear passenger heater blower in a way that doesn't make any sense to me. It will go from almost nothing to MAX and back suddenly and everything in between without any user input to any of the heater controls. This is usually worst during in the first 10 minutes from start, hot or cold but can happen after a long cruise. I hope that it isn't programmed to work like that but I have only experience from this one C6 only. Are they all like that or is there a fix?
Dave-Retired   
Fri Mar 16 2018, 09:10am

Joined: Oct 01 2009
Member No: #1
Location: Northumberland
Have you got it set to 'Auto' mode?
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hezekiel   
Mon Mar 19 2018, 10:52am
Joined: Mar 13 2018
Member No: #3469
Location: Next to Santa
Yes, it is set to AUTO. Almost seems to me that it is an intermittent failure in the circuit that controls the fan speed. Is there a description of this system and the component locations available?
Dave-Retired   
Mon Mar 19 2018, 01:49pm

Joined: Oct 01 2009
Member No: #1
Location: Northumberland
hezekiel wrote ...

Is there a description of this system and the component locations available?

Air Con Wiring schematic is available for LHD cars - Click Here -

It may be a temperature sensor, have you checked for any error codes via the OBII port?
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lee_marshuk   
Wed Mar 28 2018, 12:02am
Joined: Feb 12 2014
Member No: #1584
Location: West Midlands
Not much help I know, but mine has always done this, I have experimented with different modes but it's made no difference. No error codes for me from the OB port either!
Pracli   
Tue May 22 2018, 02:56pm
Joined: May 22 2018
Member No: #3537
Location: Budapest
Hi,
I have same issue. I found, that passenger side blown air temperature is -33C, which can be a broken NTC...
Anyone knows where is the passenger side blown air temp sensor?
( I am talking about EU version, left hand drive )
joopajaa   
Wed May 23 2018, 05:36am
Joined: Sep 06 2017
Member No: #3261
Location: Byroslavia, FIN
Mine has also now a quite lot of RPM after starting the car but I think it has to be linked with now failed right side heater flap (only warm air air from right). I think this started at the same time as the flap failed.
Pracli   
Wed May 23 2018, 11:28am
Joined: May 22 2018
Member No: #3537
Location: Budapest
The erratic blowing starts after appr 10min
I do not have any errors in climacontrol
The driver side I found near by throttle, but that is OK
Passenger side temp measure is extremly low, that can cause inconditionally heating on that side
Has anyone experience regarding position of pass side temp sensor, or can help on decode this behavior...

 

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