IPD sale XeMODeX - Experts in Volvo Electronics Free shipping all USA - Experts in Brakes
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy anything with this and it helps MVS!

A/C on-off switch

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
2004 - 2007 V70 R
2001 - 2007 XC-70
2001 - 2009 S60
2003 - 2007 S60 R

Mr. Detail
Posts: 358
Joined: Wed May 03, 2006 11:21 am
Year and Model: 2002 V70 N/A
Location: Newtown Square, Pennsylvania
Has thanked: 13 times
Been thanked: 2 times
United States of America
Mr. Detail

A/C on-off switch

Post by Mr. Detail » Mon Mar 02, 2020 6:47 am

A question for you guys as I have dealt with this as long as I have owned this car. Since it is still the winter season here in the East (does not feel like) whenever I turn on the heat in the car, the "A/C" on-off switch automatically turns on without me touching it. I can even hear the compressor kick in under the hood.
I am constantly depressing this button to shut off the air conditioning. If I need a new switch, does anyone have a tip where to buy one other than the dealer? I am sure they will soak me for a new one. I am just assuming that it is the switch. Maybe you guys have another reason. Thanks!
(See attachment below)
Attachments
DSCN2492.JPG

User avatar
Rattnalle
Posts: 1669
Joined: Fri Sep 01, 2017 2:10 am
Year and Model: 2004 V70 2.5T
Location: Sweden
Has thanked: 20 times
Been thanked: 123 times
Sweden
Rattnalle

Re: A/C on-off switch

Post by Rattnalle » Mon Mar 02, 2020 7:51 am

It's the normal behaviour. It's used for reducing the air moisture level in certain conditions apart from actually just cooling when it's hot. It shouldn't run a lot though.

And yes it's supposed to reset whenever you start the car.

With the caveat that I haven't actually seen one of these without ECC live.

User avatar
vtl
Posts: 1804
Joined: Thu Aug 16, 2012 1:35 pm
Year and Model: 2005 XC70
Location: Boston
Has thanked: 3 times
Been thanked: 56 times
United States of America
vtl

Re: A/C on-off switch

Post by vtl » Mon Mar 02, 2020 8:09 am

Don't remember how it was in 02 with manual climate control, but in my 05 with automatic it stays off. Until window defrost is turned on.

Why it worries you? Air conditioner is used to dry the air, then it is heated in heating core. I turn it off, because the donor car I've got has no afterblow function enabled, that turns A/C evaporator into a stench generator. I'm planning on updating software and killing the mildew with enzymes later in spring.
05 XC70 260k, 16 XC60 40k, 19 Tundra 1k

User avatar
abscate
MVS Moderator
Posts: 20521
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 289 times
Been thanked: 905 times
Trinidad & Tobago
abscate

Re: A/C on-off switch

Post by abscate » Mon Mar 02, 2020 12:27 pm

It is sticky and should remember where you left it....unless you put the selector to DEFROST SSS in which case it always turns AC on.
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

Mr. Detail
Posts: 358
Joined: Wed May 03, 2006 11:21 am
Year and Model: 2002 V70 N/A
Location: Newtown Square, Pennsylvania
Has thanked: 13 times
Been thanked: 2 times
United States of America
Mr. Detail

Re: A/C on-off switch

Post by Mr. Detail » Tue Mar 03, 2020 1:55 pm

Interesting, so you guys say this is normal behaviour for the switch. So when I want heat when the outside temperature is 25 degrees, it is normal for the A/C compressor to come on and stay on unless I manually hit the "OFF" side? Bizarre to me.

User avatar
abscate
MVS Moderator
Posts: 20521
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 289 times
Been thanked: 905 times
Trinidad & Tobago
abscate

Re: A/C on-off switch

Post by abscate » Tue Mar 03, 2020 3:01 pm

The compressor kicks over on start to make sure liquid gets dispersed. It won’t run if the air in the core falls below the set point, even if the green light is on.

My 2005 and 1999s all stay off if that’s where they are when the car is shut down
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

Post Reply
  • Similar Topics
    Replies
    Views
    Last post