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I hope you get someone who has the real scoop on this.
I turn mine A/C switch off at long red lights or if I have to idle. So far that is working to keep it cold while driving...but doesn't help during the long light in 90 degree sunshine...like today. Actually, it wasn't so bad...I kept the fan running and it didn't start to blow warm until the light was a about to change. Then got cold within a 100 feet or two once I turned it on.
I don't know what overheat switch you are speaking of...unless it is the low pressure switch.
Here are some answers a Volvo tech recently gave me on another board forum, (don't know if they will be helpful to you at all):
There is 2 things that can be happening.One the low pressure switch is bad and the A/C is freezing up.Or the A/C compressor is going bad.When they get hot the clutch will disengage and still have power to it.It works when the compressor is cool but once it warms up it stops.A good way to tell it let it sit on for a little.Or drive it real easy for a while.Then when you can step on it really hard hold it and let it shift at the max RPM for the gears from a stop.Atleast first and second.Then if it starts blowing warm it is the compressor.
Another answer:
If it happens again have him open the hood and look at the pipes going into the firewall on the passenger side.If they have ice on them then the low pressure switch is bad.If that isn't it have him look at the Compressor it is all the way at the bottom towards the front of the car.If the center is not spinning then most likely it is bad.Most of the time if you turn it off fro like 10 min then it will work again for a little while.
Another answer:
It is still possible that both is the cause.But if it is not icing then the compressor is bad.The compressor is bad just from age nothing you did.It is really the clutch itself that is bad.Most of the time it is just better to replace the compressor than just the clutch.Most of the time if you just replace the clutch the compressor goes shortly after that.
Another thing he can do to help is when it stops keep a metal hanger or something like that in the car.It needs to be able to stick to a magnet.If that happens with the compressor see if it sticks to the compress clutch the center part of the pulley.That would mean the compressor is still magnatized and the clutch is disengadged.Then it is bad.
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I was told last week that my compressor is good but the clutch is the problem.
He thought the switches were working fine. I think I would prefer that it just be a low pressure switch. My husband it sick of dumping $$$ into this car.
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'95 854T 125,000
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