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Any luck at replacing low-side AC schrader?

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
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Chuck W
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Any luck at replacing low-side AC schrader?

Post by Chuck W » Fri Jun 05, 2020 9:14 am

Working in the wife's '97 GLT, I've been noticing a slight leak at the low-side service port. (Minor bubbling)

I picked up one of the "no-loss" replacement kits, and it would work great....if the valve in the car was about 6mm shorter. As it is, I can't get the shut-off valve to close after the old core has been pushed to the top of the receiver piece. I verified it with one of the cores included in the kit.

Most of the listings for the valves show THESE, but what's in the car is like THIS.

The FCP listed replacement looks shorter, and would probably work fine...if I could get the old one out without making a mess.

Anyone run into this?

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Re: Any luck at replacing low-side AC schrader?

Post by scot850 » Sat Jun 06, 2020 7:34 pm

I did have luck replacing the Schraeder valve on 3 different P80's. However, I bought and used Volvo OE parts. Not worth the small saving if the system leaks afterwards as the cost of re-gassing is way higher than using the OE part. On one I just let the repair shop replace it and re-gas. They didn't charge for swapping it out.

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Chuck W
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Re: Any luck at replacing low-side AC schrader?

Post by Chuck W » Sat Jun 06, 2020 8:48 pm

The question was more in having luck swapping out the longer type with the no-loss tools. It's an easy enough process IF you can get the valve to clear the shut-off.

Her car leaks down enough about every couple years, and it's most likely coming from the service port valve. I doubt OE or AM parts for the valve really matters here.

I may be able to get it to work however, as I have an idea which I'll probably test out on my '97 T5 that I have down at the moment for a manual swap.

THIS is the tool I have.

I have removed and reinstalled the current valve with it just fine, but I can't get the valve to clear the shut-off valve, because it's too long.

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Re: Any luck at replacing low-side AC schrader?

Post by abscate » Sun Jun 07, 2020 5:11 am

Chuck, I’m having trouble with the visual here.
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Re: Any luck at replacing low-side AC schrader?

Post by crlande » Sun Jun 07, 2020 8:59 am

Once had a loose valve core on the A/C. Used a pair of forceps to reach down into the stem and tighten.

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Re: Any luck at replacing low-side AC schrader?

Post by Chuck W » Sun Jun 07, 2020 9:17 am

abscate wrote:
Sun Jun 07, 2020 5:11 am
Chuck, I’m having trouble with the visual here.
Here's a video.
https://www.youtube.com/watch?v=emV7jyaO7vA

The part where you close the shut off valve (after the plunger and valve are pushed up) is where the hang up is. The bottom of the valve core (see the pic of the one with the "tail" on the bottom seat) is obstructing the ball valve. I have to undo the retaining collar most of the way to get things to clear.
crlande wrote:
Sun Jun 07, 2020 8:59 am
Once had a loose valve core on the A/C. Used a pair of forceps to reach down into the stem and tighten.
You think I haven't tried that? ;) Besides, I have the proper tool.

I think I'm just going to have to get creative.

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Re: Any luck at replacing low-side AC schrader?

Post by abscate » Sun Jun 07, 2020 9:52 am

Maybe Volvo Schrader valves are a bit longer than standard ? I might have one in parts I can measure
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Re: Any luck at replacing low-side AC schrader?

Post by Chuck W » Sun Jun 07, 2020 10:32 am

The pictures I linked in the first post show the two types. What's in there is the large bore "euro type" with the purple seal and tail on the seat. The other ones offered have a flat bottom, and are obviously shorter.
My kit came with one of the longer ones, so I can use that to help rig up a solution.

I can *probably* get the old one out with a little luck (and maybe a tiny bit of freon loss) but I think I'll pick up some of the shorter ones to reinstall.

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