Heating!!!

mr_cs · 10th January 2009, 09:39

Simultaneously, I have three problems that might be related to each other, or might not.

The exterior temperature is said to be over 33C even though when I first noticed it, it was probably -5C outside!
The internal heater only provides heat when set to over 27C. There maybe a slight imbalance between passenger and driver vents, but not significant.
The ATC diagnostics shows fault code 22 i.e. Sunlight sensor problem.

My plan of action is to:

Easier Jobs

Replace exterior temperature sensor. I bought one today from eBay for £10.00. It seemed too good to miss.
Replace cabin sun sensor. Does anyone know where you can buy such a thing?

Difficult Job

Clean out matrix.

Does anyone have any thoughts on sun sensor, alternative suggestions or even general comments?

Thanks

Colin

GreyGhost · 10th January 2009, 09:48

Was it daylight when you ran the atc diagnostics? The sunlight sensor need sunlight / bright day to operate.
External temperature sensor may reset with a battery off reboot. Even so changing it, it will still take a while to show the correct temperature.
Heat is not produced through the dash vents on my car only windscreen, footwell and under seat rear.

mr_cs · 10th January 2009, 09:57

Thanks for the swift response.

Bright days are in short supply at the moment but I will certainly redo the ATC diagnostics when the day is at its brightest.

Sorry to be a complete dimbo, but what do you mean by a 'battery off reboot'?

I will also check for heat in the places that you suggest.

Again thanks for your help.

Colin

GreyGhost · 10th January 2009, 10:06

The vehicles electronics are controlled by the ECU and BCU computers. Disconnecting the battery for 30 minutes allows for a reboot of the computers, much the same as your home computer needs restarting if it has a minor problem.
Make sure you observe correct shut down procedure for sat nav if installed and radio code if necessary.

The Jugs · 10th January 2009, 10:11

If you go down the line of new sun sensor i've got one you can have, needlessly changed mine when it was the matrix, PM me your address and i'll post it of to you. A good touch or spot light should do if you have no decent sunlight.

Departed · 10th January 2009, 11:43

If the outside temperature sensor is reading high, it might be a short on the wiring.

The sunlight sensor relies on infra red, rather than visible light. A nice warm torch should work, but certainly not an LED one. Never heard of one failing but I have seen them for sale on the bay of fleas.

FROGGY · 10th January 2009, 12:18

Quote:

Originally Posted by Grey Ghost

Heat is not produced through the dash vents on my car .

It should.

Mick

James.uk · 10th January 2009, 12:34

Hi Colin. My car delivers heat through its chest level vents? I can turn the heat off by using the scroll wheel under the middle ones, but they will certainly deliver heat when required. (on a good day!).

I think you have a poor-loose connection on the outside sensor, as for a sunlight reading, this is England in the winter, so why does that worry or surprise you? heh heh..

:lol:

If the heat is about the same both sides why bother to do the matrix? Personally I would leave that job till summer gets here, then do it at your leisure one balmy summer evening..

.

GreyGhost · 10th January 2009, 12:56

Quote:

Originally Posted by FROGGY

It should.

Mick

Having just read the handbook I see that it is possible if you fiddle with all the knobs and buttons. I always leave mine on 21º-23º Auto or Econ. default setting. That's why.

I find it comfortable on those settings all year round.

T-Cut · 10th January 2009, 14:43

The automatic temperature control (ATC) system doesn't actually work in 'Econ' mode. The A/C compressor is turned off and the system simply works like an old fashioned heater. The temperature of the air is determined by the temperature of the coolant and all you get to moderate is airflow rate. My cab often gets too warm in 'Econ' and changing the individual temperature settings is ineffective.

10th January 2009, 09:39	#1
mr_cs Regular poster 2003 Rover 75 CDTi Saloon Join Date: Aug 2007 Location: Fobbing, Near Basildon, Essex Posts: 76 Thanks: 0 Thanked 0 Times in 0 Posts	Heating!!! Simultaneously, I have three problems that might be related to each other, or might not. The exterior temperature is said to be over 33C even though when I first noticed it, it was probably -5C outside! The internal heater only provides heat when set to over 27C. There maybe a slight imbalance between passenger and driver vents, but not significant. The ATC diagnostics shows fault code 22 i.e. Sunlight sensor problem. My plan of action is to: Easier Jobs Replace exterior temperature sensor. I bought one today from eBay for £10.00. It seemed too good to miss. Replace cabin sun sensor. Does anyone know where you can buy such a thing? Difficult Job Clean out matrix. Does anyone have any thoughts on sun sensor, alternative suggestions or even general comments? Thanks Colin

10th January 2009, 09:48	#2
GreyGhost Banned 180+ Sport Auto Join Date: Oct 2006 Location: Bedford Middle Level Posts: 17,787 Thanks: 0 Thanked 18 Times in 5 Posts	Was it daylight when you ran the atc diagnostics? The sunlight sensor need sunlight / bright day to operate. External temperature sensor may reset with a battery off reboot. Even so changing it, it will still take a while to show the correct temperature. Heat is not produced through the dash vents on my car only windscreen, footwell and under seat rear. Last edited by GreyGhost; 10th January 2009 at 10:04..

10th January 2009, 09:57	#3
mr_cs Regular poster 2003 Rover 75 CDTi Saloon Join Date: Aug 2007 Location: Fobbing, Near Basildon, Essex Posts: 76 Thanks: 0 Thanked 0 Times in 0 Posts	Heating!! Thanks for the swift response. Bright days are in short supply at the moment but I will certainly redo the ATC diagnostics when the day is at its brightest. Sorry to be a complete dimbo, but what do you mean by a 'battery off reboot'? I will also check for heat in the places that you suggest. Again thanks for your help. Colin

10th January 2009, 10:11	#5
The Jugs Loves to post Rover 75 saloon club SE manual 2.0 V6 Join Date: May 2008 Location: Chatham, Kent. Posts: 289 Thanks: 0 Thanked 0 Times in 0 Posts	If you go down the line of new sun sensor i've got one you can have, needlessly changed mine when it was the matrix, PM me your address and i'll post it of to you. A good touch or spot light should do if you have no decent sunlight. __________________ [SIGPIC][/SIGPIC] Last edited by The Jugs; 10th January 2009 at 10:14..

10th January 2009, 10:06	#4
GreyGhost Banned 180+ Sport Auto Join Date: Oct 2006 Location: Bedford Middle Level Posts: 17,787 Thanks: 0 Thanked 18 Times in 5 Posts	The vehicles electronics are controlled by the ECU and BCU computers. Disconnecting the battery for 30 minutes allows for a reboot of the computers, much the same as your home computer needs restarting if it has a minor problem. Make sure you observe correct shut down procedure for sat nav if installed and radio code if necessary.

10th January 2009, 11:43	#6
Departed Retired -- Join Date: Jan 2007 Location: -- Posts: 3,785 Thanks: 0 Thanked 4 Times in 4 Posts	If the outside temperature sensor is reading high, it might be a short on the wiring. The sunlight sensor relies on infra red, rather than visible light. A nice warm torch should work, but certainly not an LED one. Never heard of one failing but I have seen them for sale on the bay of fleas.

10th January 2009, 12:34	#8
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	Hi Colin. My car delivers heat through its chest level vents? I can turn the heat off by using the scroll wheel under the middle ones, but they will certainly deliver heat when required. (on a good day!). I think you have a poor-loose connection on the outside sensor, as for a sunlight reading, this is England in the winter, so why does that worry or surprise you? heh heh.. :lol: If the heat is about the same both sides why bother to do the matrix? Personally I would leave that job till summer gets here, then do it at your leisure one balmy summer evening.. .

10th January 2009, 14:43	#10
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	The automatic temperature control (ATC) system doesn't actually work in 'Econ' mode. The A/C compressor is turned off and the system simply works like an old fashioned heater. The temperature of the air is determined by the temperature of the coolant and all you get to moderate is airflow rate. My cab often gets too warm in 'Econ' and changing the individual temperature settings is ineffective.