IPD sale XeMODeX - Experts in Volvo Electronics
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy your stuff using this and it helps MVS!

98 S70 N/A 5-Speed: Complete A/C job (yay!) not holding a vacuum... (sigh!) How do I troubleshoot this?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

User avatar
theWIFES_S70
Posts: 1133
Joined: Fri Jul 24, 2015 10:34 pm
Year and Model: 1998 S70 base
Location: Queens, New York
Has thanked: 31 times
Been thanked: 24 times
Peru
theWIFES_S70

98 S70 N/A 5-Speed: Complete A/C job (yay!) not holding a vacuum... (sigh!) How do I troubleshoot this?

Post by theWIFES_S70 » Sat Sep 22, 2018 11:43 pm

This has been a job about three months in the making... Finally got around to tackling the job today.

I replaced all the lines and hoses, the evaporator, dryer, all o-rings... My god, this job hurts! How do you guys with giant hands replace those A/C lines on the Condenser?

I pulled a vacuum for about 30 mins (with 4 month old vacuum pump oil!), pulled it down to 30 bar. But then, it dropped down to 25 five minutes later... I had to leave for dinner so I don't know how much further it went down.

How do I get troubleshoot this? Do I fill it with freon, add dye, and then figure it out the old fashioned that way? Is there an o-ring that frequently get pinched and/or forgotten? I thought I was careful...
You do not have the required permissions to view the files attached to this post.


1998 Volvo S70, N/A, 5-speed, 183K
2007 Volvo S40, 2.4i, 5-speed, 97K

User avatar
abscate
MVS Moderator
Posts: 18802
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 221 times
Been thanked: 729 times
Trinidad & Tobago
abscate

Re: 98 S70 N/A 5-Speed: Complete A/C job (yay!) not holding a vacuum... (sigh!) How do I troubleshoot this?

Post by abscate » Sun Sep 23, 2018 6:01 am

How are you watching the drop? Is that with the pump attached but turned off?

25 is no good. It should hold a solid pegged 29-30

You replaced every oring you touched, right? Some of them are easy to misalign if you don’t pay attention


Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW

User avatar
theWIFES_S70
Posts: 1133
Joined: Fri Jul 24, 2015 10:34 pm
Year and Model: 1998 S70 base
Location: Queens, New York
Has thanked: 31 times
Been thanked: 24 times
Peru
theWIFES_S70

Re: 98 S70 N/A 5-Speed: Complete A/C job (yay!) not holding a vacuum... (sigh!) How do I troubleshoot this?

Post by theWIFES_S70 » Sun Sep 23, 2018 10:37 am

abscate wrote:
Sun Sep 23, 2018 6:01 am
How are you watching the drop? Is that with the pump attached but turned off?

25 is no good. It should hold a solid pegged 29-30

You replaced every oring you touched, right? Some of them are easy to misalign if you don’t pay attention
I'll try pulling a vacuum again. I'm not sure if I closed the gauge before shutting off the vacuum. (My dad was hungry and wanted to go out to dinner already.

Two connections and o-rings to condenser, are perfect.

O-rings to compressor... not so sure. When I pulled the hoses, didn't see any o-rings so I installed my new hoses without any o-rings saying, "okay..." Only to then find o-rings still on the old hoses. (Hello another 2 hrs of work!) I installed new o-rings onto the compressor, lubed and everything, and installed the hoses. Like I mentioned, this was such a pain to do! I am less confident about these o-rings.

Hard lines with double o-rings and trombone fittings... got them to fit. So they are fine. Caveat, I didn't really know you had to reinstall them with the removal tool. (This is literally the only car on Youtube that requires the removal tool to reinstall these lines... why Volvo!) I tried to shove in the lines without the tool for a while before taking a month off and returning to this job. I am wondering if I broke my evaporator somehow...

Hard lines were new and had o-rings installed already. The large nut is tight. I'm pretty confident about this one.

The two sensors (replaced those o-rings). Pretty confident about those, too.

The Dryer... Sheesh... I was able to drop it, and get a wrench and some Channelocks on it. Not 100% confident about it. But I think I got it.


1998 Volvo S70, N/A, 5-speed, 183K
2007 Volvo S40, 2.4i, 5-speed, 97K

User avatar
abscate
MVS Moderator
Posts: 18802
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 221 times
Been thanked: 729 times
Trinidad & Tobago
abscate

Re: 98 S70 N/A 5-Speed: Complete A/C job (yay!) not holding a vacuum... (sigh!) How do I troubleshoot this?

Post by abscate » Mon Sep 24, 2018 10:36 am

You have to seat those O-rings before you get the fastener started or some of them will get caught in the threads..

I think I have a picture of when that happened to me once..

yeah, on this page - one of the hard lines up at the EVAP firewall rolled in the groove, and snapped.

viewtopic.php?f=1&t=56005&hilit=1999+v70+t5&start=30


Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW

User avatar
abscate
MVS Moderator
Posts: 18802
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 221 times
Been thanked: 729 times
Trinidad & Tobago
abscate

Re: 98 S70 N/A 5-Speed: Complete A/C job (yay!) not holding a vacuum... (sigh!) How do I troubleshoot this?

Post by abscate » Mon Sep 24, 2018 1:39 pm

Oh yeah, I hope that vacuum was 29 inches Hg, not bar.

Those negative pressures ripple the space time continuum and wreak havoc..


Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW

Ozark Lee
MVS Moderator
Posts: 14796
Joined: Thu Sep 07, 2006 8:24 am
Year and Model: Many Volvos
Location: USA Midwest
Has thanked: 4 times
Been thanked: 47 times
United States of America
Ozark Lee

Re: 98 S70 N/A 5-Speed: Complete A/C job (yay!) not holding a vacuum... (sigh!) How do I troubleshoot this?

Post by Ozark Lee » Mon Sep 24, 2018 7:10 pm

I have had bad manifold gauge set hoses cause an apparent vacuum leak. To eliminate that variable you can pull the vacuum and then remove the hoses and walk away for an hour or so. When you plug the manifold gauge set back in you should still be under vacuum.

Depending on how good you are at getting the connector on and off you might lose a fair amount of vacuum but if you verified that the vacuum held you can pull the vacuum again and then immediately charge the system.

...Lee


'94 850 N/A 5 speed
'96 Platinum Edition Turbo
Previous:
1999 V70XC - Nautic Blue - Totaled while parked.
1999 V70XC - RIP - Wrecked Parts Car.
1998 S70 T5
1996 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe

User avatar
abscate
MVS Moderator
Posts: 18802
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 221 times
Been thanked: 729 times
Trinidad & Tobago
abscate

Re: 98 S70 N/A 5-Speed: Complete A/C job (yay!) not holding a vacuum... (sigh!) How do I troubleshoot this?

Post by abscate » Mon Sep 24, 2018 7:52 pm

You can close off the low pressure port on the car, leave it overnight.

In the morning, pump it down while leaving the low side port closed

Now you need to go into high awareness mode with your ears. With the pump running, open the low port, listen for a change in the pump noise, from wwwwhhhhirrrrr to Wuckawhuckawhucka

If it just whirs, the vacuum has held overnight.

I’m actually sourcing parts for a full scale vacuum gauge on mine


Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW

User avatar
theWIFES_S70
Posts: 1133
Joined: Fri Jul 24, 2015 10:34 pm
Year and Model: 1998 S70 base
Location: Queens, New York
Has thanked: 31 times
Been thanked: 24 times
Peru
theWIFES_S70

Re: 98 S70 N/A 5-Speed: Complete A/C job (yay!) not holding a vacuum... (sigh!) How do I troubleshoot this?

Post by theWIFES_S70 » Mon Sep 24, 2018 11:04 pm

Thanks for the suggestions, fellas. Will get to this over the weekend and see how the vacuum is doing. I hope there's no pinched o-ring. Taking it all apart and doing it all over again would be such a pain. Luckily, don't think the wife will need A/C till next Spring at the earliest! :lol:

And, not driving the car for a month made my power steering stiff again. Will need to refresh that ATF again!


1998 Volvo S70, N/A, 5-speed, 183K
2007 Volvo S40, 2.4i, 5-speed, 97K

User avatar
theWIFES_S70
Posts: 1133
Joined: Fri Jul 24, 2015 10:34 pm
Year and Model: 1998 S70 base
Location: Queens, New York
Has thanked: 31 times
Been thanked: 24 times
Peru
theWIFES_S70

Re: 98 S70 N/A 5-Speed: Complete A/C job (yay!) not holding a vacuum... (sigh!) How do I troubleshoot this?

Post by theWIFES_S70 » Sun Oct 07, 2018 9:13 pm

Finally got around to pulling a vacuum on my A/C system again. This time for 40 mins! I followed all the correct steps and, while I hoped beyond all hope!, it was pretty evident there was a pretty big leak somewhere in the system. (Dropped close to 10 bar in five minutes...) :(

Will disconnect and drop drier and drier hose and tighten them... Hopefully it's that. Otherwise, it's probably the evaporator I broke trying to shove in my trombone fittings without a disconnect tool...


1998 Volvo S70, N/A, 5-speed, 183K
2007 Volvo S40, 2.4i, 5-speed, 97K

User avatar
abscate
MVS Moderator
Posts: 18802
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 221 times
Been thanked: 729 times
Trinidad & Tobago
abscate

Re: 98 S70 N/A 5-Speed: Complete A/C job (yay!) not holding a vacuum... (sigh!) How do I troubleshoot this?

Post by abscate » Mon Oct 08, 2018 4:55 am

The Evap is really hard to break, I doubt it is that.

You can also test it in place, too.

Everything else is a pain but at least the dash stays in


Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW

Post Reply