Question about Mercury Mountaineer

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Have a A/C problem with my 2003 Mercury Mountaineer.A/C not working.Replaced clutch relay switch and high side cut off switch.Hooked a can of 134a with gauge and it's telling me system is full but still not blowing hot air.At a loss as to what to check next.

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  • fxrsmike Aug 02, 2010

    Thanks I'll look into this !

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  • Mercury Master
  • 22,156 Answers

Sorry but your can isnt the same as my machine which cost me a lot of money ,now if you think the AC is charged ,is the clutch clicking in and turning the compressor ,if so then you will need the machine to test the high pressure coming from the pump which should be at least 200lbs for it to work,but as you havent got this machine then try this ,start motor and turn AC on ,now providing the clutch kicks in and the pump is working then at the back of the compressor where the pipes go in the smaller pipe which is the high pressure feed should be well hot now if its not this means that the compressor isnt producing enough pressure so this could be two fold ,either the compressor is no good or the what i call the venturi or restrictor valve isnt working .Sorry i cannot give you a decent fixya type answer but providing the clutch is clicking on then test the high pressure pipe(thin) and if its not hot then this what i have described is your problem .if clutch isnt kicking in then run a wire direct to it and see what happens

Posted on Jul 28, 2010

  • fxrsmike Jul 28, 2010

    Clutch is clicking on and off.Although it seems more often than it should.I don't know but there could be some kind of restriction because when it kicks on the clutch that is, the idle kicks up to around 1000 or 1200 RPM and the truck makes like a howling or grumbling noise.Not sure why that is.When the clutch kicks off the idle returns to normal and seems fine.Any ideas what might cause this.



    Thanks

  • Colin Stickland
    Colin Stickland Jul 28, 2010

    sounds like too much gas ,this will cause the compressor to lock up ,the rise in idle speed is correct when AC cuts in ,but remember us in europe only have little engines so that to me is normal but i would hazard a guess and say that your AC unit should have about 750 grams of gas and by the sound of it you have about double this amount at least or compressor wouldnt lock up,i would suggest you take vehicle to a garage that has a machine and empty it and the machine will tell you how much gas you had in the AC then vacumn it and then put the correct amount of gas back in ,then it will work --now i know you could just release some but that would be committing a offence here ,were very much into green in europe .Even your top up gas cans are prohibited here ,and R12 can only be obtained in a small can now and thats only old stock .I have to refill them with R134 which needs a bigger rad in the front of the vehicle but it does work of sorts

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cant follow that. at all , sorry.
i dont need a good list
what i need is symptoms and test facts.
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