|
700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
Information |
|
940 air conViews : 797 Replies : 6Users Viewing This Thread : |
|
Thread Tools | Display Modes |
Nov 6th, 2015, 07:52 | #1 |
New Member
Last Online: Feb 4th, 2018 13:27
Join Date: Apr 2015
Location: falaise
|
940 air con
Hi , I have a problem with the heating system, the air con compressor seems to work intermitently when we switch the blower on to demist the screen. According to the dashboard switch the air con should be off,and the heating dial is on 24. Is this normal?
Thanks Seb |
Nov 6th, 2015, 12:33 | #2 |
Member
Last Online: Jun 11th, 2019 13:41
Join Date: Oct 2015
Location: Charleston
|
If your compressor is cycling off and on while it should be engaged your system is probably low on refrigerant due to a leak somewhere.
|
Nov 6th, 2015, 12:40 | #3 |
Getting old disgracefully
Last Online: Yesterday 20:49
Join Date: Jan 2009
Location: South Essex
|
Hi, I pretty sure the AC is supposed to come on when you switch it to de-missed well it does on my 760 as the cooling action take the moisture out of the air even though you will have the heat on, I could be wrong that's the norm but there should be someone on here that will put you right
|
Nov 6th, 2015, 13:00 | #4 |
Forum Support Team
|
Hi,
The default action for cars fitted with AirCon and when demist option is selected is for the AirCon to be working. You will see the AirCon light on the switch on when clearing the front screen. You would be best to check the compressor and see what is happening. As mentioned if the system is low on gas then the clutch will kick in and out more and more rapidly to the point where the system will stop trying. So if the wheel is stationary even with the belt then you're all out of gas. If you use AirCon infrequently it is probably the seals gone/going. But get the system tanked up with refrigerant and whatever uv leak detector they use to see where you are losing your gas. You also need to use the system regularly - at least one a week to help keep the system in good leak free condition. Des. . .
__________________
Density:- Not just a measurement ~ It's a whole way of Life.! ! ! I drive a Volvo, Please Don't Get In My Way! He shows up. People die. He vanishes. People should not be afraid of their governments. "He'll deliver more justice in a weekend than 10 years of your Governments should be afraid of their people... "V" courts & tribunals. Just stay out of his way." "I plan to."
Last edited by CTCNetwork; Nov 6th, 2015 at 13:05. |
Nov 6th, 2015, 17:24 | #5 |
New Member
Last Online: Feb 4th, 2018 13:27
Join Date: Apr 2015
Location: falaise
|
Thanks for all the help,I will get the system topped up and see what happens
and report back Seb http://www.volvoforums.org.uk/images.../thumbs_up.gif |
Nov 9th, 2015, 12:11 | #6 |
Master Member
Last Online: May 8th, 2024 15:43
Join Date: Feb 2006
Location: Amersfoort (NL)
|
Testing
If a low refrigerant level is low the low pressure switch causes the system to cycle on/off very frequently. You can test by temporarily bypassing this switch. Take the connector from the switch (located on the aluminium can shaped part on the exhaust side of the engine) and connect both reminal of the connector with eg a paperclip. If the cycling is now back to a normal frequency your refrigerant level is too low.
Note bypassing the switch is not a permanent solution and as long as you do not have the system refilled you should not use it. You can disable the AC system by taking out the paperclip and leaving the connector loose from the switch. |
The Following User Says Thank You to Rversteeg For This Useful Post: |
Nov 10th, 2015, 20:27 | #7 |
New Member
Last Online: Feb 4th, 2018 13:27
Join Date: Apr 2015
Location: falaise
|
Thanks for the explanation,I will test to see if I am low on gas.Good to know I can bypass the ac system and still use the heating system
Seb |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|