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2010 XC90 AC problem

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
byter
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2010 XC90 AC problem

Post by byter » Thu Jun 04, 2020 6:02 am

My 2010 XC90 AC is currently behaving quite abnormally. When i started the car and AC, it blows cold air. Then within few minutes if i keep the car idle, then the air will become warmer. But if i drive, it will keep the air cold.

I opened the front hood and touched the low side (compressor suction line), initially it was cold then after a while it will gradually be less cold and finally warm. Then if i pour water on the condenser, the AC will blow cold air again, and the low side piping will also become cold again. After the water totally evaporate, again the air will become warm.

Any suggestion what will be the problem? Is it the condenser?

Thanks.

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pgill
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Re: 2010 XC90 AC problem

Post by pgill » Thu Jun 04, 2020 10:05 pm

To evaluate the AC system you really need pressure gauges.

But first confirm

1. The radiator fan turns on when you turn on the A/C

2. The AC clutch does engage when you turn on the AC

For my 2010 S80 I had to replace the compressor and the desiccant bag in the condenser.

It is possible that the desiccant bag is clogged and limiting performance.

To know for sure you need an A/C gauge set

Good luck

Paul

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Re: 2010 XC90 AC problem

Post by byter » Sat Jun 06, 2020 5:19 am

Dear Paul,

Thanks for the reply. I have checked and findings as below;
1. Yes the radiator fan is running.
2. Yes the clutched is engaged.

The low and pressure side measured when the AC running is 32 psi and 175 psi respectively. Ambient temperature is around 35 deg C.

Appreciate further recommendation.

Regards,

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pgill
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Re: 2010 XC90 AC problem

Post by pgill » Sat Jun 06, 2020 6:44 pm

The pressure that you measured are exactly what you want.

I wouldn’t suspect an AC problem with those pressures.

I assume that you got those pressures even with the air vents blowing warm air instead of cold air.

If that is true then the problem is more likely related to the climate control computer or its sensors or actuators.

The way to think about it is that for some reason your XC90 is turning on the heat and AC at the same time.

I don’t know enough about the climate control system in the XC90 to provide more advice.

Good luck

Paul

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Re: 2010 XC90 AC problem

Post by pgill » Sat Jun 06, 2020 6:50 pm

Take a look at this link for one possible solution

http://volvoxc90site.com/xc90-air-condi ... diagnosis/

Thanks

Paul

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Re: 2010 XC90 AC problem

Post by byter » Sat Jun 06, 2020 8:36 pm

Dear Paul,

Thanks for the reply.

Another thing that I observed was that when I increased the fan speed (initially it was on 2, increased to 3), then High pressure reduced from 175 psi to 150 psi and maintained there. No change observed on Low side pressure. From that moment, gradually cabin air becoming warm. I had to switched off the AC, again switched ON, then only the pressure back to 175 psi. Cool air back to normal.

Any idea?

Regards,

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pgill
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Re: 2010 XC90 AC problem

Post by pgill » Sat Jun 06, 2020 10:24 pm

Based on the fact that the pressure is dropping when the air blows warm.

I would add some Freon R134a to the system.

Don’t let the high pressure side go above 220 PSI. (With a 35C ambient)

If you add 50 to 100 grams it should raise the high side above 180 PSI


The only caveat to this recommendation is that the AC compressor does wear out over time and it may not be able to generate 180 PSI, if that is what’s happening then the solution is to replace the compressor

Let me know what what you find out.

Thanks

Paul

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Re: 2010 XC90 AC problem

Post by byter » Mon Jun 08, 2020 4:09 am

Dear Paul,

Finally found the problem. It was the compressor solenoid valve.

Connected the gauge today for adding gas and the low was giving 70psi while high side was <150 psi.

So replaced the solenoid valve, vacuum and refill the gas, and finally the ac works like a charm. I bought the solenoid recently but not replaced, wasn’t sure what the problem was and didn’t want to do double job.

Thanks for the guide!

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Re: 2010 XC90 AC problem

Post by pgill » Mon Jun 08, 2020 10:53 am

That’s an amazing result

Congrats on finding the solution

If you get a chance post the part number that you replaced, in case someone in the future reads this thread.

Welcome back to the cold!!!

Take care

Paul

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Re: 2010 XC90 AC problem

Post by byter » Mon Jun 08, 2020 11:47 am

The part number is 31305844. Some suppliers call it Control Valve while some others call it Pressure Switch. Not sure why it has different name but what i bought was mentioned control valve.

Just before I decided the valve was having problem, when the air became warmer (and observed high side pressure dropping), I removed the electrical connection for the valve and reconnect back. Then observed the pressure again slowly increased to 175 psi.

Suspected the valve was not actually failed totally, but it was sticky thus creating this kind of behaviour.

Regards,

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