Volvo Community Forum. The Forums of the Volvo Owners Club

Forum Rules Volvo Owners Club About VOC Volvo Gallery Links Volvo History Volvo Press
Go Back   Volvo Owners Club Forum > "Technical Topics" > C30 / S40 & V50 '04-'12 / C70 '06-'13 General

Notices

C30 / S40 & V50 '04-'12 / C70 '06-'13 General Forum for the P1-platform C30 / S40 / V50 / C70 models

Information
  • VOC Members: There is no login facility using your VOC membership number or the details from page 3 of the club magazine. You need to register in the normal way
  • AOL Customers: Make sure you check the 'Remember me' check box otherwise the AOL system may log you out during the session. This is a known issue with AOL.
  • AOL, Yahoo and Plus.net users. Forum owners such as us are finding that AOL, Yahoo and Plus.net are blocking a lot of email generated from forums. This may mean your registration activation and other emails will not get to you, or they may appear in your spam mailbox

Thread Informations

V50 AC Blowing Warm - Temperature Sensor Blocked

Views : 3204

Replies : 11

Users Viewing This Thread :  

Reply
 
Thread Tools Display Modes
Old Apr 20th, 2019, 13:22   #1
eric19371
Clueless
 

Last Online: Mar 27th, 2024 21:40
Join Date: Apr 2013
Location: Wrotham
Cool V50 AC Blowing Warm - Temperature Sensor Blocked

I recently resolved an issue with the external temperature sensor on my '04 V50 by cleaning the electrical connectors in the door connector (as described elsewhere in these forums) but the AC still isn't blowing cold.

Before I take it to a local garage to get it re-gassed I decided to check for fault codes and it came up with:

"Blower Fan motor passenger compartment temperature sensor, Blocked"

I have had a search through these forums and other forums and I have found enough to make me want to get this checked before I have it re-gassed. So far I have not been able to find any guidance specific to the S40/V50 and I would be grateful for any guidance anybody can give me in locating and unblocking the sensor.
__________________
Current Volvo's: S40 1.8 (55) & V50 2.4i (04)
Past Volvo: S40 1.8 ('97/R) & 240 GLE ('76/R)

eric19371 is offline   Reply With Quote
Old Apr 21st, 2019, 20:24   #2
Jarndyce
Junior Member
 

Last Online: Apr 6th, 2022 23:37
Join Date: Jun 2015
Location: Hertfordshire
Default

There is a temperature sensor for the AC in the passenger footwell. It's quite high up in the centre console and can be located by the wires running to it. Peeling back the carpet should reveal it.
Jarndyce is offline   Reply With Quote
The Following User Says Thank You to Jarndyce For This Useful Post:
Old Jun 27th, 2019, 15:12   #3
eric19371
Clueless
 

Last Online: Mar 27th, 2024 21:40
Join Date: Apr 2013
Location: Wrotham
Default

Temperature sensor replaced. Error message went away but no change with the AC. The bought a bottle of refrigerant from Halfords which was a waste of £50 as it only took about 10% of the bottle before it said it was full. Then took it to a specialist my local garage recommended (Aircon Direct, Gravesend) who properly tested and regassed the system.

Still have a fault where the AC won't work if the outside temperature sensor malfunctions which it has started doing again so I have ordered a new sensor.
__________________
Current Volvo's: S40 1.8 (55) & V50 2.4i (04)
Past Volvo: S40 1.8 ('97/R) & 240 GLE ('76/R)

eric19371 is offline   Reply With Quote
Old Jun 27th, 2019, 16:00   #4
LizardOfBodom
WowIcanwriteAnythingHere!
 
LizardOfBodom's Avatar
 

Last Online: Mar 26th, 2024 17:05
Join Date: May 2016
Location: Dublin/Meath
Default

How is the outside temp sensor relevant for AC operational? I mean, yes - for auto climate calculations, of course, but if you put AC to LOW mode, it should blow cold regardless of temperature, no? I thought its like "override" button.
(I may be wrong, just thinking out loud...)
__________________
2005 V50 T5AWD M66, Stage1 Hilton tune
E-focus torque mount, E46 bi-xenon retrofit v2 , (also available in PDF form), DTSC fully-off mod, Brembo discs+ATE ceramic pads
LizardOfBodom is offline   Reply With Quote
The Following User Says Thank You to LizardOfBodom For This Useful Post:
Old Jun 27th, 2019, 16:13   #5
Welton
Premier Member
 

Last Online: Sep 14th, 2021 18:03
Join Date: Feb 2009
Location: Market Harborough
Default

Exert from my little climate control data pages 'teased' from the internet years ago:

"the outside temperature sensor, (an NTC resistor), is located in the left-hand door mirror. The OEM transmits the signal over the CAN where it is captured by the CCM.

The CCM uses the signal to allow activation of the compressor down to a temperature of approx -5deg C.

The ECC also uses the signal to regulate the direction of the air in the passenger compartment (defroster, ventilation or floor or combinations of these).

Diagnostic trouble codes for the outside temp sensor are managed by the OEM"


So, if the system thinks it is less than -5deg C outside it may well prevent the compressor running.
__________________
2005 S40 T5 SE - Manual. Bilstein B4's. (For Sale)
2010 Citroen C4 1.6 HDi (bizarre Gearbox model).
2010 Renault Twingo (refreshingly simple)
2018 Infiniti Q30 1.6T Business Executive (what's this button do?)
Welton is offline   Reply With Quote
The Following 2 Users Say Thank You to Welton For This Useful Post:
Old Jun 27th, 2019, 16:13   #6
eric19371
Clueless
 

Last Online: Mar 27th, 2024 21:40
Join Date: Apr 2013
Location: Wrotham
Red face

Quote:
Originally Posted by LizardOfBodom View Post
How is the outside temp sensor relevant for AC operational? I mean, yes - for auto climate calculations, of course, but if you put AC to LOW mode, it should blow cold regardless of temperature, no? I thought its like "override" button.
(I may be wrong, just thinking out loud...)
You are 100% correct, I just wasn't very clear.

The auto climate operation is now working when the outside temp sensor works, when the sensor sporadically fails the calulations go down the toilet. Before I took it to be serviced it didn't work even when set to LO.
__________________
Current Volvo's: S40 1.8 (55) & V50 2.4i (04)
Past Volvo: S40 1.8 ('97/R) & 240 GLE ('76/R)

eric19371 is offline   Reply With Quote
The Following User Says Thank You to eric19371 For This Useful Post:
Old Jul 14th, 2019, 18:08   #7
Resonance
Junior Member
 

Last Online: May 19th, 2020 19:55
Join Date: Apr 2017
Location: Beds
Default

Quote:
Originally Posted by eric19371 View Post
Temperature sensor replaced. Error message went away but no change with the AC. The bought a bottle of refrigerant from Halfords which was a waste of £50 as it only took about 10% of the bottle before it said it was full. Then took it to a specialist my local garage recommended (Aircon Direct, Gravesend) who properly tested and regassed the system.

Still have a fault where the AC won't work if the outside temperature sensor malfunctions which it has started doing again so I have ordered a new sensor.
The temp sensor, is it the one circled in the pic?
Attached Images
File Type: jpg IMG_4198.jpg (197.6 KB, 71 views)
Resonance is offline   Reply With Quote
Old Jul 15th, 2019, 12:14   #8
eric19371
Clueless
 

Last Online: Mar 27th, 2024 21:40
Join Date: Apr 2013
Location: Wrotham
Default

Looks like I have managed to get very confused and replaced the wrong sensor. The error going away seems to have just been lucky because it's back. :-(

So anyway...

* The AC system has been regassed so it now blows cold
* The clutch on the compressor has been adjusted so it doesn't cut out after ten minutes when it is warm
* The passenger compartment sensor has been replaced (didn't need to do that, damn!)
* The external temperature sensor (in the door mirror) has been replaced so it is now giving consistent readings but it was a non original item from eBay and is about 2 degrees too low but that's okay because at least the auto climate operation now works (I may get a genuine Volvo item in the future)

I think that Resonance may have helped me a load with that photo (thanks!) to help me identify the correct blower fan temperature sensor as accurately pointed out by Jarndyce but misunderstood by me (sorry).

Like it says under my name, I can be clueless at times and miss things first time round.
__________________
Current Volvo's: S40 1.8 (55) & V50 2.4i (04)
Past Volvo: S40 1.8 ('97/R) & 240 GLE ('76/R)

eric19371 is offline   Reply With Quote
The Following 2 Users Say Thank You to eric19371 For This Useful Post:
Old Oct 9th, 2019, 09:32   #9
baldmosher
moshmobile driver
 
baldmosher's Avatar
 

Last Online: Apr 22nd, 2023 17:07
Join Date: Nov 2010
Location: Warrington
Default

Quote:
Originally Posted by eric19371 View Post
* The clutch on the compressor has been adjusted so it doesn't cut out after ten minutes when it is warm.
Any idea how they adjusted the clutch? My local AC place doesn't think it's adjustable.
baldmosher is offline   Reply With Quote
Old Oct 9th, 2019, 11:55   #10
LizardOfBodom
WowIcanwriteAnythingHere!
 
LizardOfBodom's Avatar
 

Last Online: Mar 26th, 2024 17:05
Join Date: May 2016
Location: Dublin/Meath
Default

Quote:
Originally Posted by baldmosher View Post
Any idea how they adjusted the clutch? My local AC place doesn't think it's adjustable.
because they either dont want to do it or want you to spend extra money...
recently had this done to my car - cost me 26e for the tool to remove clutch plate, thats all, works like a charm.

look around for AC Compressor Shimming keywords

https://www.volvoforums.org.uk/showt...=282543&page=2

also random vid on YT
https://www.youtube.com/watch?v=zOjq...ature=youtu.be
__________________
2005 V50 T5AWD M66, Stage1 Hilton tune
E-focus torque mount, E46 bi-xenon retrofit v2 , (also available in PDF form), DTSC fully-off mod, Brembo discs+ATE ceramic pads
LizardOfBodom is offline   Reply With Quote
The Following 2 Users Say Thank You to LizardOfBodom For This Useful Post:
Reply

Tags
blocked, sensor, temperature


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 08:57.


Powered by vBulletin
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.