Question about 2004 Volvo S40

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2004 s40 volvo-ac works for 10 minutes then gets warm.

Ac works for 10 minutes then gets warm. I shut it off for five minutes then back on and it works/blows cold for another 10 minutes. Ant thoughts?

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Evaporator leaking or condensor fan inop

Posted on Jul 31, 2009

  • pwhrmn01 Jan 17, 2011

    Had the same problem...what happened with mine was that when the compressor clicks on...it pulls in the clutch plate to complete the circuit and start cooling the air....but the gap between the plate and the compressor housing has to be just right. Over time..the gap between the plate and the housing expands from the heat. You prob don't hear the click anymore after a little bit right?? To fix, remove the compressor clutch plate carefully and inside where the plate sits will be washers..just remove one or more and this will close the gap. If you have none in there..time for a new compressor. I saved $1000 doing that 10 minute job. My air is nice and cool!!! :)

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2003 mercury sable, AC will blow ice cold until I spend too long sitting in traffic then it starts to blow warm, if I shut AC off and start moving after about 5 minutes I can turn it back on and it gets...


It's gathering frost inside. When you turn it off & drive around for a short while, it defrosts & starts working again.

I'll bet when you park it, you find a pretty large pool of water under it half an hour later, don't you?

Sorry, that's the nature of the beast - it's worse in humid weather, not so bad in dry weather. Pretty nearly all cars (with AC) do that unless the AC is designed oversized.

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Blows cold when first started and then blowes warm


I would replace the AC compressor cycling switch it may be sticking have seen it a number of times. The switch is located in the receiver dryer on the passenger side of the engine compartment. See picture below.


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If this isn't the problem the AC compressor relay may also cause this, flip a coin.

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Air cinditioning wont stay on, it switches to heat and wont shut off


What do you mean when you say it wont shut off? is it blowing hot air or do you just feel a lite flow of hot air even if you have the settings to cold?

If this is the problem that you always feel hot air at low flow and the ac goes to hot air then i would say one of two things, first if you have the selector to cold and you feel hot air then there may be a problem with the blend door, this door move to allow hot or cold air, the door may be broken or just a bad motor that controls it. keep in mind if the ac system shuts down for any reason the air then will be warm, it will be about the same temp as outside and maybe a little hotter.

this problem almost sounds like the ac compressor shuts off and then you are getting the outside air which is hot, there are many reasons for the compressor to shut off, it could be the compressor clutch heating up and disengaging , this would be due to a bad compressor clutch.

another reason is the fans are not working, the best thing to do is when the system starts to blow warm check and see if the compressor is running, start engine and look at the front of compressor, with ac off the front of it will not move, and then with ac on the front will spin, check it out and let me know, if it blows warm air and ac is not working then it may be compressor problem but if you are getting warm air and the compressor is spinning then it may be a door problem.

This is hard to check with out testing the system, so i listed a few things to check and let me know the out come. also the ac blows cold for how long before it gets hot air blowing out of the vents, good day.

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too much freon is the same as not enough freon

Have an 04 mazda6 as well, AC seems to be the cars weakness. It takes 15-20 minutes till my car is ina driveable condition (Phoenix, AZ)

Take it in for a tune up, but I doubt the AC will be any better

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you still got a leak,could be the ac hose,recharge again but this time w/dye so u can see if theres a leak,good luck keep posted..

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1998 Volvo V70 A/C Intermittent


I had exactly the same problem. When your engine is cold and off check the gap on your ac compressor with a feeler gauge, it should be between 0.3 and 0.5mm. If it is larger you need to re-shim which invloves undoing a nut on the end off the compressor and removing the clutch plate, then removing the appropriate shims (look like washers) then replace. The reason it blows warm after 10 minutes or so is because the ac compressor gets hot and the clutch gap gets too large for the electro-magnetic clutch to engage. Some people would say that you need a new compressor but all you need to do is a re-shim.

Mar 01, 2009 | 1999 Volvo V70

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