A/C turns off suddenly - Volvo Forums - Volvo Enthusiasts Forum


Volvo S40 The S40 is Volvo's most affordable sedan with all the amenities of a luxury sports car.

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 07-16-2018, 08:47 PM
Member
Thread Starter
 
Join Date: Jun 2015
Posts: 46
Unhappy A/C turns off suddenly

Hi there!

On my son's 05 S40 the a/c suddenly turns off. The whole system is brand new (compressor, condenser, dryer, radiator... even a pipe!) then there is no leaks, was working well but recently behaves bad. Sometimes turns on sometimes don't and when is working (which is good and cold) suddenly turns off.

I bring it to the shop and the technician doesn't found anything wrong... in fact works pretty good by 3 days!!! We tough some false contact in the cable at the compressor and after the test was ok. Today after I was driving for a couple miles turns off again!

I don't know what else check... relay, fuse, switch... any ideas?
Reply With Quote
  #2  
Old 07-17-2018, 09:25 AM
Senior Member
 
Join Date: Nov 2006
Location: Birmingham AL
Posts: 1,312
Default

You have to determine whether it is electrical related or mechanical related. I will go ahead and assume that you have no leaks because it comes on and works sometimes.

The most common problem that I have seen on Volvo cars of this age is that the air gap on the compressor clutch is too large and can't engage when the compressor is warm.
Reply With Quote
  #3  
Old 07-17-2018, 11:14 AM
Senior Member
 
Join Date: Feb 2013
Location: Mesa, AZ
Posts: 241
Default

Tony1963 is right - that's a really common problem, especially with a high-mileage vehicle that's seen lots of A/C use. You can check this by looking to see if the compressor clutch is engaged when the A/C stops working. If it's not engaged, and a light tap on the face of the clutch will cause it to engage (be careful!!!) then you've found the problem.

There are some no-$$$ fixes for this problem, or you can rebuild the clutch, or replace it. I used some gardening wire to shim up my V70's compressor clutch and it worked as long as I drove the car after that (around a year of Arizona A/C duty).
Reply With Quote
  #4  
Old 07-17-2018, 12:07 PM
Senior Member
 
Join Date: Nov 2006
Location: Birmingham AL
Posts: 1,312
Default

Yes, that will work but I prefer to remove the compressor and remove the shim. I know that it calls for recovering the AC charge, removing the radiator fan for clearance and probably other clearance issues on the S40, but it becomes a repair for the remaining life of the vehicle.

While everything is apart, I generally replace the orifice tube and accumulator assembly.

You will have to make the tool to pull off the face of the clutch though. I made one from an old rear brake pad and followed a diagram that someone showed long ago. It works.
Reply With Quote
  #5  
Old 07-17-2018, 01:10 PM
Senior Member
 
Join Date: Feb 2013
Location: Mesa, AZ
Posts: 241
Default

Clearance on my V70 was horrible, and removing the compressor would have been a gold-plated bear. It took me 15-20 minutes to shim the clutch (with some pretty humorous-looking methodology to reach the clutch) and my kludgy fix seemed to work just fine. I'm never one for tearing apart a system that doesn't absolutely have to be. All the shimming wire did was hold the face of the clutch a couple mm closer to the electromagnet, which allowed it to reliably engage, so as odd as it might look, it works as well as a new clutch, at least until the clutch itself burns out (which I'm guessing will never happen).

But I get the desire to "do it right"... but in my case, that would have meant hours of cramped wrenching in triple digit temperatures. ;-)

FYI, the post I made on the subject is here: https://volvoforums.com/forum/2001-2...-option-78578/
Reply With Quote
  #6  
Old 07-17-2018, 01:40 PM
Senior Member
 
Join Date: Nov 2006
Location: Birmingham AL
Posts: 1,312
Default

I've had maybe 1/2 dozen of these cars over the years have this issue and the first couple I simply installed a reman compressor. When I realized the core issue, I guess I did what I used to do which was remove the compressor and reinstall after removing the shim.

As a dealer, I might not always pursue the easiest repair but I wouldn't want to explain to someone how I did the other repair. Albeit that it works, just not my thing. I do understand your story.
Reply With Quote
  #7  
Old 07-18-2018, 10:44 AM
Senior Member
 
Join Date: Feb 2013
Location: Mesa, AZ
Posts: 241
Default

Tony, if you're a dealer, there's no way you could be doing the fix I did (at least not unless you had a very compliant, understanding customer). Doing it "right" is your only option, while I am free to pursue the path of least resistance, since I can't sue myself. ;-)
Reply With Quote
  #8  
Old 07-20-2018, 05:40 PM
Moderator
 
Join Date: Mar 2012
Location: Ridgefield, CT
Posts: 3,627
Default

Rereading the original post, it was noted that the compressor was replaced which should rule out the clutch gap issue. Since it's intermittent, the tech may have to guess. One thing I'd look into is electrical connections to the compressor as well as the high and low pressure sensors. If you catch a failure, then you can try jumpering the pressure sensors to see if it resolves.
Reply With Quote
  #9  
Old 07-20-2018, 05:45 PM
Senior Member
 
Join Date: Nov 2006
Location: Birmingham AL
Posts: 1,312
Default

Recent laws have changed to allow a ham sandwich to be sued. You cannot, however, name the individual components in the suit. You can't list the ham, bread, mustard, etc individually, you have to name the sandwich.

Volvo Owner vs Ham Sandwich
Reply With Quote
  #10  
Old 07-20-2018, 05:46 PM
Hudini's Avatar
Senior Member
 
Join Date: Oct 2007
Location: Shanghai, China
Posts: 2,643
Default

If it's a reman and the clutch passed inspection cold then they will reuse it.

I too think it needs the deshimming procedure. On my 2005 it took 20 minutes as you do not need to remove the compressor. The clutch is easily accessible through the wheel well.

Reply With Quote
  #11  
Old 07-20-2018, 05:52 PM
Senior Member
 
Join Date: Nov 2006
Location: Birmingham AL
Posts: 1,312
Default

Yes, they could have used the original clutch if it tested correctly (which it will even with a large air gap).

You're lucky that the compressor is right out there on your model. You will need to fabricate a pulling device to get the outer piece off. There is also a bolt in the center that needs to come out.
Reply With Quote
  #12  
Old 07-20-2018, 06:51 PM
Senior Member
 
Join Date: Feb 2013
Location: Mesa, AZ
Posts: 241
Default

Wow... that photo brought a tear to my eye. On my V70, there wasn't nearly enough room to get my hand between the face of the clutch and the metal fender. It looks like fiddling with the A/C clutch on the S40 / V50 would be downright trivial.
Reply With Quote
  #13  
Old 07-25-2018, 10:11 PM
Hudini's Avatar
Senior Member
 
Join Date: Oct 2007
Location: Shanghai, China
Posts: 2,643
Default

There are other tricks like removing the motor mount to get a few more inches up or down. Similar to when you are changing the timing belt and need to access the crank pulley and water pump.

And I didn't need a clutch puller. Just removed the 10mm bolt and the clutch came off neatly. Watch for the 3 shims to fall out. Luckily mine remained with the clutch to be removed with a small pick.

Last edited by Hudini; 07-25-2018 at 10:14 PM.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1997 Upper engine oil leak engine quit turns over no strain on starter but belt turns Nightc New Members Area 1 06-01-2015 12:51 AM
2000 Volvo s80 2.9 Turns on but seconds later turns off Stb7 Volvo S80 2 11-06-2013 09:12 AM
A/C Works & Then Suddenly the Heat Turns On? mkirn66 2001-2013 model year V70 1 08-13-2013 10:06 PM
Car turns irself off when making hard right turns. Ever happened to you? Iggyomega Volvo S60 & V60 11 01-09-2010 01:56 PM
intermittently shuts off *suddenly*, at idle mbwittig Volvo 850 1 05-08-2007 03:51 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Advertising
Featured Sponsors
Vendor Directory

All times are GMT -5. The time now is 10:50 AM.


© 2018 MH Sub I, LLC dba Internet Brands
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.