Recharge A/C - which port and where?

[Ozark Lee]

6nm sounded more like a higher pressure port than 3nm

That is the torque spec on the cap, not the system pressure. I think they printed it on the cap to keep people for getting carried away with a socket wrench while snugging it down.

...Lee

[Pauloil]

It's the port with 6 Nm on it next to the serpentine belt. The steps can be found in the repair database I think. But briefly,
1. Take off the cap on the port. I had to use a small wrench to take it off.

2. Turn on car, turn A/C to max, recirculate inside car, blower max as well, wait 3 min.

3. Shake can vigorously, connect to the port, you'll feel the can becomes colder as R134a injected.

4. Done.

well, the standard hose to connect to the port clips onto the port AFTER you fill it with Freon.
screw can onto the right end and pierce the can by screwing the valve down. now hold the clip at the other end open and open the screw valve a bit so you get all the air out of the hose. now you are ready to connect to the running car and have someone rev it a bit while you turn the can from side to side with the top end up.

[abscate]

Each can is a bit different depending on maker. Some have a button to depress, the piercing valve type above is on the better cans and is easier to use.

The whole system capacity is a bit more than 2 cans,depending on model and market, so if you are adding more than a can every other year, you have a leak. Each time you add a consumer can, without evacuating the system, you are adding air and water to the system which eventually kills expensive components.

You can add a can with dye indicator, run the system for a week, the look under the hood at night with your 1970s black light looking for leaks. If you don't find any, it's the dreaded EVAP core under the dash, which is a 100 USD part but 5-10 hours of labour to remove.

[luckykolo]

So I understand that in order to check the R134a pressure on my S70 98 (High Side) - I need to disconnect high side pressure sensor. Use R12 adapter 3/8"? Also, disconnecting High side pressure sensor won't have an impact on running AC? It's just a high pressure cut off switch, right? Thanks

[abscate]

I don’t think there is a high pressure port connector under the sensor. You can monitor the pressure with VIDA or a decent scanner

[luckykolo]

I found this: Part Number: 3545079
Supersession(s): 3522293
Air Conditioning Refrigerant Charging Port Schrader Valve.
Fits S70 (1998 - 2000)
https://www.bostonvolvocarsparts.com/p/ ... 45079.html
https://www.bostonvolvocarsparts.com/a/ ... 73985.html
Anyone tried to use it for High Side readings?
Thanks