Question about Mercury Mountaineer

1 Answer

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.

Posted by on

  • fxrsmike Aug 02, 2010

    Thanks I'll look into this !



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Mercury Master
  • 22,359 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.


  • 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



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My 2003 mercury mountaineer the air just power it seems.wont do nothing.make no sound at was working fine

You mean no air blowing out of the vents ? Blower motor maybe , blower motor relay , high speed control relay , blower motor resistor . Do you know to test automotive electrical circuits , how to read a wiring diagram so you know what circuits to test ? Doesn't matter that it was working fine , that's the nature of automotive electrical systems . Your best bet mite be to take to a repair shop. But if you care to try and fix it yourself there are videos on youtube.
how to fix your blower motor in 2003 Mercury Mountaineer Ford explorer

Aug 18, 2017 | Mercury Cars & Trucks

1 Answer

2006 odyssey a/c was coming on for a little while then stops only hot air blowing. Fuse all good resistor good relay for clutch good. Has 134a pressure goes high then clutch kicks out. Now a c never comes...

cant follow that. at all , sorry.
i dont need a good list
what i need is symptoms and test facts.
so fuse good to me means 12v on both sides of the fuse. (nothing else)
1: so, the list. heater fan on high works, always, does it?
2; The clutch is dead, great test, its #2 all the time.
3: then you check the voltage at the Hi/low switch.
12v good, 0v on one side bad.
the switch kills the Clutch on purpose to save the compressor from destriction.
so of the switch opens, the clutch is cut.
that means only 2 things.
low pressure or insane too high (overfilled)
or the switch is defective.
use a AC fill kit and watch the pressure, if the pressure is good
and the switch opens, the switch is bad,
if the pressure is bad, (not spec) then get that corrected.

Sep 24, 2013 | 2007 Honda Odyssey EX

1 Answer

1994 olds 88 royale A/c wont start or charge 134a

AC clutch has to be energized for the compressor to turn and cool. Check out the thermostat as well as the low pressure cut off switch, relays for proper operation.

If you connect the 12 volts to the hot side of the clutch it should engage - if so that indicates that the issue is caused by some electrical item in line with the circuit that powers the clutch.

Apr 24, 2017 | Cars & Trucks

2 Answers

A/C wil not work

if your low on freon the unit will not work.low pressure switch cuts it off. or you have a bad a/c clutch asy.

Jun 12, 2009 | 2004 Hyundai Santa Fe

2 Answers

2002 mercury mountaineer 4.0 starter relay location

The power distribution box is
located in the engine compartment.
The power distribution box contains
high-current fuses that protect your
vehicle’s main electrical systems
from overloads.
The starter relay is in position #56 of that box.

Mar 23, 2009 | 2007 Mercury Mountaineer

2 Answers

2003 Mercury Mountaineer no heat

no you have to remove the vent between the hood and the windsheild its on the out side of the car it sounds like your freshair vent is stuck open

Dec 17, 2008 | 1997 Mercury Mountaineer

1 Answer

Air conditioning

did you check system pressure? approx. 30lbs.if ok then either comp. clutch coil is weak, too much clutch gap, pressure switch weak, relay is cutting out too early. also check high side pressure to confirm plugged in line filter.

Aug 07, 2008 | 1996 GMC Jimmy

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

541 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercury Experts

gerry bissi

Level 3 Expert

4376 Answers


Level 3 Expert

81423 Answers


Level 3 Expert

5687 Answers

Are you a Mercury Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides