Air Con Help - Page 2

ardvark · 11th August 2019, 11:11

I did a diagnosis check and the fault was FC 21 and 22
Or line it says Sun Light Sensor fault.
When I go the car the sensor on top of the dash in the middle right at the front wasn't in place properly.
I take it the previous owner messed about with it.
If it is this causing the fault how do I take it out without breaking anything?
I'm thinking about swapping it from the one in my old car but as said I don't want to break it taking it out.

ardvark · 11th August 2019, 11:29

I've messed about with the sensor and did another test.
The result was FC 00
So in theory there is no fault.
Before I test the air con I take it the engine has to be warmed up first the I press the AUTO button to turn the air con on?

T-Cut · 11th August 2019, 18:03

This link will get you to a download of the owner's Handbook: http://storm.oldcarmanualproject.com...nersmanual.pdf

All you need to know about heating, ventilation and Climate Control is in there.

TC

SD1too · 11th August 2019, 21:58

Quote:

Originally Posted by ardvark

... Or line it says Sun Light Sensor fault ...If it is this causing the fault ...

It isn't.

Quote:

Originally Posted by ardvark

Before I test the air con I take it the engine has to be warmed up first ..

I'm not sure what you mean by "test the air con". If you mean running the built-in diagnostics then the answer to your question is no. It makes no difference whether the engine is cold or warmed up.

I suggest that you seek the assistance of T4.

Simon

Coups · 12th August 2019, 08:16

If your temp is set to low and you then press auto then the system does blow at full pelt in an attempt to reach the temp selected. If I do this in my car then the display temp changes to from low to 16 too. It did on my ZT before it and the 75 before that. Pressing auto again does nothing and pressing econ simply disengages the ac compressor. If you wish to lower the fan speed then you have to do that manually (or adjust the temps up to the ambient and the blowers will stop trying to force cool air into the cabin to lower the temp). The direction of flow shouldn't change from that which you had set before pressing auto. The exception being if you had pressed demist instead of auto.

Sent from my SM-G935F using Tapatalk

victorgte · 12th August 2019, 09:07

I’m not far from you just south of Evesham. Happy to take a look for you. I also have a spare control panel if yours is not working as it should.

11th August 2019, 11:11	#11
ardvark Al 75 CDTI Tourer Auto Join Date: Mar 2009 Location: Studley Posts: 1,457 Thanks: 1 Thanked 69 Times in 48 Posts	I did a diagnosis check and the fault was FC 21 and 22 Or line it says Sun Light Sensor fault. When I go the car the sensor on top of the dash in the middle right at the front wasn't in place properly. I take it the previous owner messed about with it. If it is this causing the fault how do I take it out without breaking anything? I'm thinking about swapping it from the one in my old car but as said I don't want to break it taking it out. __________________ ARDVARK

11th August 2019, 11:29	#12
ardvark Al 75 CDTI Tourer Auto Join Date: Mar 2009 Location: Studley Posts: 1,457 Thanks: 1 Thanked 69 Times in 48 Posts	I've messed about with the sensor and did another test. The result was FC 00 So in theory there is no fault. Before I test the air con I take it the engine has to be warmed up first the I press the AUTO button to turn the air con on? __________________ ARDVARK

12th August 2019, 09:07	#16
victorgte I really should get out more....... MGTF, MGZT, Range Rover Join Date: Sep 2013 Location: Cheltenham Posts: 2,803 Thanks: 395 Thanked 633 Times in 446 Posts	I’m not far from you just south of Evesham. Happy to take a look for you. I also have a spare control panel if yours is not working as it should. __________________ MG TF 135, MG ZT, Range Rover P38

11th August 2019, 18:03	#13
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	This link will get you to a download of the owner's Handbook: http://storm.oldcarmanualproject.com...nersmanual.pdf All you need to know about heating, ventilation and Climate Control is in there. TC

12th August 2019, 08:16	#15
Coups Posted a thing or two Rover 75 Contemporary SE Join Date: Apr 2014 Location: Dundee Posts: 1,941 Thanks: 545 Thanked 520 Times in 402 Posts	If your temp is set to low and you then press auto then the system does blow at full pelt in an attempt to reach the temp selected. If I do this in my car then the display temp changes to from low to 16 too. It did on my ZT before it and the 75 before that. Pressing auto again does nothing and pressing econ simply disengages the ac compressor. If you wish to lower the fan speed then you have to do that manually (or adjust the temps up to the ambient and the blowers will stop trying to force cool air into the cabin to lower the temp). The direction of flow shouldn't change from that which you had set before pressing auto. The exception being if you had pressed demist instead of auto. Sent from my SM-G935F using Tapatalk