Helpful Volvo air conditioning related questions and answers found here, drawn primarily from threads from the Volvo Forum.
Volvo AC – The Best of the Best Air Conditioning Problems & Fixes
- Air Conditioning Theory + Practice
- Blows Cold, Then Goes Warm
- 2005 XC70 AC Works, Then Stops Working
- 850 AC Drainage & Condensation Work
- Whirling Noise From The AC Compressor
- AC Thermal Switch Delete
- AC Takes Sweet Time to get Cold in Volvo XC90
- XC90 Recharging Air Conditioning Tips
- AC System Moisture Prevents Cool Air, 2001+ Volvos
- AC clutch shim procedure for S60
- Volvo S40 Air Conditioning
- Volvo 850, S70, V70, XC70 1992-2000: Compressor Clutch wasn’t kicking in because of Thermal Sensor
- Volvo 850, S70, V70, XC70 1992-2000: Should AC Compressor Cycle on/off While Driving?
The Major Air Conditioning Components in Your Volvo
AC Compressor Cycling? AC Air Not Cold?
It’s probably the level of refrigerant — R134a — or it’s the clutch. If it’s the refrigerant level, you need a can or two of 134a and a gauge, and it’s something you can do at home fairly easily. Read below for instructions on recharging your Volvo’s AC.
Shim the AC Clutch
When the AC clutch doesn’t meet the belt correctly you’ll have similar symptoms to low refrigerant charge… warm air, revs dropping every 10 or 20 seconds, etc.. Here’s how to shim the AC clutch on an S60. Here’s how to shim the AC clutch on an 850, V70/XC70 up to 2000, S70, or C70.
2001+ V70 Low Pressure Port Location
Do not use the high pressure port that is right up front above the radiator. That’s the high side for shops with pro AC refill equipment. Instead, move a couple items out of the way and use the AC low port.
How to Recharge Volvo S80 AC
Per VADIS, the A/C system should be recharged on the high side. Finding this to be not only odd, but dangerous, I recharged my system on the low side (port is underneath the power steering reservoir). Per other posts I read, it’s impossible to overcharge, since the DIY kits available at local parts stores do not allow for overcharging-they simply stop transferring refrigerant when the maximum system pressure is reached. … [Recharge Volvo S80 AC]
How To Recharge Volvo 850 Air Conditioning System
A good forum thread on compressor cycling, recharging and pressure… [Compressor cycling, recharging and pressure]
Another good How To on recharging the refrigerant yourself.
Cool Zone #390 complete recharge kit” I bought from autozone $48 bucks, it has 3 cans of refrigerant they each have the charge…
[Intermittent AC compressor] Warning: please be very careful. Recharging AC isn’t for the inexperienced.
Volvo 850 AC-Related Info
From Haynes 850 manual: Coolant Capacity: turbo: 7.6 quarts non-turbo: 6.4 quarts type: r-134a Refridgerant Capacity: cold climates: 20 ounces hot climates: 26 ounce. 850 High Side AC discharge hose is 1/2 inch in diameter.
Volvo 850 Low Pressure Line
It is located on the passenger side of the engine compartment near the radiator and is marked with a “70NM” [Volvo 850 Low Pressure Line]
Replacing the AC Evaporator
The best photo documentation on how to get to the Volvo 850, S70 and V70 evaporator, period: Changing an Evaporator Core – in Pictures
The only special tool I needed besides a bunch or Torx bits was the spring coupler set. I got mine from snap-on part number: ACT118B The description says its for Fords but it works for the Volvo A/C line/evaporator connection. You MUST use this tool (not necessarily this specific set from snap-on) to disconnect the evaporator from the A/C lines otherwise you will most likely damage the A/C lines…
Flashing AC and RECIRC Lights
Why the flashing light? “A/C unit is faulty”, according to the manual.
Symptoms on my 1997 S70 was either there was a quick fan blow, everything stopped then the two lights flashed for 20 secs or nothing happened the two lights just flashed, no A/C and no fan. I took it to the dealer for a very expensive repair close to 700 dollars and the fix was a fan motor drawing excessive current. So if you are a DIY, check the fan first or the electronic part that controls it for any burned or failed components. I would do it if this happens again as I strongly believe it was the electronics that was likely faulty. By the way my A/C is a ECC unit. [Flashing AC and RECIRC Lights]