Question about 2007 Mercury Montego AWD Sedan

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AC diagnosis help 2005 mercury Montego

My AC, which was never very good at low speed has completely quit cooling. It was a slow death. For a while I was able to get cooling by running at 2500 RPM or more, but now nothing. I bought a recharge kit and the low pressure side was a little low so I charged it to just below the maximum pressure for the temperature. The AC clutch engages and the fan turns on. The high pressure output tube from the compressor gets so hot I cannot touch it after a the AC has been engaged for less than a minute. I am interpreting this as it is compressing something. The condenser seems to be at ambient temperature. None of the parts that I can touch seem warm. The accumulator also seems to be at ambient. Short of buying a guage kit is there anything else I can do to figure out what is broken?

Posted by Anonymous on


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  • 319 Answers

You should check for a clogged orifice tube. It'll be located right before the evaporator inside the refrigerant line. Also, your desiccant in the receiver/dryer is probably saturated but since you are opening the system anyway, you should probably replace it anyway.

Posted on Mar 19, 2017


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Posted on Jan 02, 2017

  • 420 Answers

SOURCE: ac not blowing cold air.

Sounds like the compressor has failed.

Posted on Apr 19, 2009

  • 477 Answers

SOURCE: temp guage showing hot, not getting any heat for 1992 Mercury Cap

If the hoses to and from the heater core are hot , and you say the heater core is hot , then the only answer is that the air duct that flows into or out of the heater core plenum ( housing ) is not opening.
Heater control on dash borad inoperative.
Not sure about 92 capri , some cars have a cable linkage , some work on vacume motors.
Try to find a haynes manual for your car , they will walk you through almost every step of anything you may ever want to do to your car.

You seem to know what you are doing , but I gotta ask ........the heater core you felt was up behind the dash inside the passenger compartment of the car right ?

Posted on May 10, 2009

  • 44 Answers

SOURCE: '93 merc topac. A/C compressor clutch does not engage

You need to replace this part!

Posted on Aug 07, 2009

  • 1627 Answers

SOURCE: 2007 Mercury Milan Premier V6 ac compressor clutch

you may need to top up the coolant,r112,r140or what ever the car is useing. if the car can'nt be topped up then you have a leak that needs to be fixed,usually the drier.

Posted on Oct 14, 2009

  • 196 Answers

SOURCE: I'm replacing brake pads on 2005 mercury montego

are you using the right tools? Id call you local auto parts store to make sure the set your using is correct, if it is the right set, id be asking how far out the piston is, on these newer vehicals, if you screw them out to far, almost to the point of being removed, they will not go back in or at least are very tricky to do

Posted on Mar 19, 2010

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