Question about Ford Escape

2 Answers

My 2003 Escape has an A/C problem. The A/C works GREAT and blows cold air. But only when the engine is at idle or under a light load. When the engine is under load (like when climbing a steep hill or pulling a good sized trailer) it just blows outside air into the car. I suspect that the flapper valves in the air registers lose vacuum and fail to their default position which is to blow outside air into the passenger compartment, but I've been told that the 2003 and newer Escapes have no vacuum systems at all! If so, what powers the air register valves that control air temperature and control which air ducts the air is blown to? Or maybe there is some kind of sensor that senses when the engine is under load and disengages the compressor clutch to facilitate momentary accelerating or something? Does the engine have a manifold vacuum sensor? (The car has the 3 liter 24 valve V-6) Could that sensor be bad and causing an early disengage of the A/C clutch?

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  • cherylray08 Jul 08, 2010

    We took the car to an A/C service guy to recharge the system and
    he says it is fully charged. No need for a recharge. The A/C blows
    cold at idle and normal around town driving.






    Is it possible that the PCM is shutting off the compressor too
    early? Right now, the A/C shuts off when pulling a trailer on the
    slightest grade. I guess I have two questions:



    1. What sensor does the PCM use to decide the engine is at
    60% of full throttle?



    2. Can I adjust or override this sensor to have the
    compressor keep running even when the sensor thinks I’m at 60% power?






    I’ve got to pull a trailer from Texas to California which
    means driving through a lot of high heat areas. Having the A/C trip off
    for the slightest grade is going to make for a miserable drive.



  • cherylray08 Jul 12, 2010

    Hey thanks - We had the car checked by a Ford Diagnostic system - they found no problems. They worked for HOURS and only charged us the diagnostic fee - not an hourly fee, thank goodness. Although it proved there was nothing seriously wrong with the system - it has reassured us that all major type issues are fine. But in the process they did find that the system was actually low in refigerant - apparently the "Jiffy-Lube" type place that originally checked it was wrong! We've corrected the levels and all is well now. But we do feel reassured that all major A/C components and systems are running just fine. Thanks

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  • Ford Master
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The AC compressor in this car is disengaged at about 60% of full throttle to give u more power, it is also possible u have less than a full charge of refridgerant, the outlet temp of the should be at about 32 F after the system has been run for 5 minutes or so. if u had a vacuum issue the air flow would switch to the defrost vents, that is called the safety default, so if the air continues to come out the dash registers then u have no vacuum problem. pulling a steep hill and a boat will almost certainly cause the compressor to kick off as the load exceeds 60% of full throttle, this is all controlled by the cars central computer, thios computer is vcalled the power train control module or PCM for short. My experience? 35 years as a Ford dealer tech with a masters in electoonic engine controls and climate control from Ford and ASE

Posted on Jul 08, 2010

  • yadayada
    yadayada Jul 08, 2010

    I strongly suggest you have the electronic system tested for fault codes, this could be a throttle pedal sensor problem, but that must be checked on a Ford dealer diagnostic scanner, u can't just throw one on.

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  • Ford Master
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Likely on most cars, this means that the weather is cool or that there is insufficient refrigerant in the system. It can also be caused by a restriction in the A/C system or high temperature or excessive amount of refrigerant in the system.

Check pressure and levels, also I suggest check the pressure switch located on the accumulator.

HERE can find several items to check.

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Posted on Jul 08, 2010

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