Volvo XC90 AC question... low side port

The Blue Whale · Post by **The Blue Whale** » 25 Feb 2012, 08:14

Where is the low side port for freon on my 2.5 fwd xc 90.

I see 2 differing ports under the hood?

And, what (if any) is the easiest way to get to the air ducts in my dashboard. I want to check out why my driver's side air is not cool while the passenger side is fine.

The Blue Whale · Post by **The Blue Whale** » 11 Mar 2012, 09:05

shameless bump.

Post by **jimmy57** » 11 Mar 2012, 11:35

The low side is on line in front of timing belt cover. The service port on the core support panel by RH hood latch is high side pressure, not for refrigerant addition. That system does not have a sight glass or any other way to monitor charge level so add 1/2 can and see if cooling is good before you add any more. Overcharging is not a good thing to do.
Left side warmer in temp is a symptom on P2 models of low refrigerant charge.

The Blue Whale · Post by **The Blue Whale** » 12 Mar 2012, 15:52

Thanks.

Passenger side was regeistering about 60 degrees F and the driver side a little above that.

Added not a whole can to it and the passenger side went down to about 40 and the driver side to 50. I stopped adding because of overfilling fears. those temperatures are fine.

Post by **regent** » 12 Mar 2012, 16:01

It would not hurt to doublecheck the low side pressure on a hot day, to be on the safe side as far as refrigerant charge level.

The Blue Whale · Post by **The Blue Whale** » 31 Mar 2012, 08:38

Thanks.

When it was hotter, I added a can. Both air vents reading 40 degrees.

Why does the driver side get warm and the passenger side not when low of freon.

Post by **jimmy57** » 31 Mar 2012, 15:57

When low the evaporator will be cold only part way across. All the liquid has turned to gas and the cooling is only from that evaporation so it is not cold past where the liquid-gas change has occurred. On the duel side system the evaporator air flow is divided by a partition on the discharge side to go left and right. The evaporator refrigerant flow comes in on right and that is the cold side when it is low. When you added some you made the left side cold most of the way and adding even more got the whole evaporator cold and temps evened out.
Some cars without L/R individual control can behave the same when the airflow is not turbulent past the evaporator.
Some vehicles will get end vents cold/center vents warm or vice versa when charge is low.

Outdoorguy1963 · Post by **Outdoorguy1963** » 06 Jul 2012, 07:36

I may have had a leak in my AC. How do I know if I had a leak of AC Ester oil? A greenish slimy oil with a funny smell came out. I see I can buy that separately. The AC is not blowing cold air. How to I add that, and how much, as well as freon to a 2002 V70? Thanks for any help