Question about Ford F-250

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Ford 99 diesel air condition cuts out after driving down road. works great while driving until you stop at light, then shortly after driving again it will stop. the compressor clutch stops spinning. if i turn it off for 3 minutes or so it will work again until same thing happens. it has 44 or 43 psi low side pressure while working. if i put guage on it when it fails it shows near 100 lbs. if i shut off switch for few minutes and turn back on the pressure will go right down to 43

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  • bmcgyver Jul 19, 2008

    ford 99 diesel air condition cuts out after driving down road. works great while driving until you stop at light, then shortly after driving again it will stop. the compressor clutch stops spinning. if i turn it off for 3 minutes or so it will work again until same thing happens. it has 44 or 43 psi low side pressure while working. if i put guage on it when it fails it shows near 100 lbs. if i shut off switch for few minutes and turn back on the pressure will go right down to 43. someone told me it could be a relay getting and going bad, but i cant find one on my truck. i don't think it has one. could it be orfice tube clogging

  • bmcgyver Jul 19, 2008

    ford 99 diesel air condition cuts out after driving down road. works great while driving until you stop at light, then shortly after driving again it will stop. the compressor clutch stops spinning. if i turn it off for 3 minutes or so it will work again until same thing happens. it has 44 or 43 psi low side pressure while working. if i put guage on it when it fails it shows near 100 lbs. if i shut off switch for few minutes and turn back on the pressure will go right down to 43. someone told me it could be a relay getting and going bad, but i cant find one on my truck. i don't think it has one. could it be orfice tube clogged. it will only happen when driving. i can leave the truck idle for a long period of time and it blows cold the entire time

  • bmcgyver Jul 19, 2008

    ford 99 diesel air condition cuts out after driving down road. works great while driving until you stop at light, then shortly after driving again it will stop. the compressor clutch stops spinning. if i turn it off for 3 minutes or so it will work again until same thing happens. it has 44 or 43 psi low side pressure while working. if i put guage on it when it fails it shows near 100 lbs. if i shut off switch for few minutes and turn back on the pressure will go right down to 43. someone told me it could be a relay getting and going bad, but i cant find one on my truck. i don't think it has one. could it be orfice tube clogged. it will only happen when driving. i can leave the truck idle for a long period of time and it blows cold the entire time

  • bmcgyver Jul 19, 2008

    ford 99 diesel air condition cuts out after driving down road. works great while driving until you stop at light, then shortly after driving again it will stop. the compressor clutch stops spinning. if i turn it off for 3 minutes or so it will work again until same thing happens. it has 44 or 43 psi low side pressure while working. if i put guage on it when it fails it shows near 100 lbs. if i shut off switch for few minutes and turn back on the pressure will go right down to 43. someone told me it could be a relay getting and going bad, but i cant find one on my truck. i don't think it has one. could it be orfice tube clogged. it will only happen when driving. i can leave the truck idle for a long period of time and it blows cold the entire time

  • bmcgyver Jul 19, 2008

    need someone who knows ac systems in and out. i have worked on vehicles and motorcycles for 20 years. i need a mechanic not a part installer. i don't want to be directed to a website that has close problems . please if someone can troubleshoot my problem. I can test anything needed. please help

  • bmcgyver Jul 19, 2008

    still need a MECHANIC for ac systems not a part installer. any good mechanic will know what i mean. if it was a 2 stroke or 4 stroke motorcycle i can answer any question anyone has. i just don't know ac systems thanks inadvance

  • bmcgyver Jul 23, 2008

    doesn't seem to be that. checked low pressure switch when compressor stopped. jumped across plug and compressor didn't start up. after 4 or so minutes it just started back up

  • bmcgyver Jul 23, 2008

    not shorting out

  • bmcgyver Jul 23, 2008

    pressure in low side only drops to around 40 maybe 38 when reved up. i dont believe it is a fan cooling problem because it will never do it if i am idling with the engine reved up for a long period of time. will blow ice cold when not moving. will only mess up when driving. i don't know the high pressure side when it cuts out because i dont have a fitting that size to connect to it. although i tried unhooking the low pressure switch and jumping acrossed and it didn't com on and then i tried to unhook highside switch and even crossed that plug with no luck either way. i noticed one time that line going into evaporator was very cold but one coming out was not.thanks

  • bmcgyver Jul 24, 2008

    thanks for the info. going to put in new orfice tube and vacume down system. will let you know. thanks alot

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Did you look ate the wireing to see if its shorthing, I'd check the controll.s on the dash . then the blower eiring ..

Posted on Jul 19, 2008

  • Rishi Roshan Ali Jul 24, 2008

    Try tightening the compressor belt. It may have just run a bit slack.

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Compresser is laking in power from some were check

Posted on Jul 19, 2008

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Http://www.swedishbricks.net/700900FAQ/HeatingAirConditioning1.html

plz check this link..it cud help
Have a nice day!

Posted on Jul 19, 2008

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U have to with a good car mechanic

Posted on Jul 19, 2008

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Hello bmcgyver,

can you measure your high side pressure. i think you are having a clogged system. if your driving, your condenser is being cooled by the wind passing thru but when you stop, that wind stop too and the pressure at the high side which is the condenser when not being cooled would shoot up and would trigger your high pressure switch. that would stop your compressor from engaging. you can check your clutch fan on your engine, if the fan is so loose then you will really have a high pressure. if that is the case, it would help to put an auxillary fan that would cool the condenser when you turn on the airconditioner. ask a local electrician to fit you a fan at the condenser.

i hope i was able to solve your problem, pls rate me.

you can test my theory by placing an industrial fan in front of the condenser and run the aircon at idling and you will notice that the compressor is no longer stopping.

tnx, drcool

Posted on Jul 19, 2008

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  • francis rivero Jul 19, 2008

    i did find some more information on your last comment. i i understand correctly, only when you driving that the compressor clutch is stopping?.. but when your on idling, the compressor countinously runs?..is that correct,?



    if that is the case, it could be a clogged orifice tube or a plane and simple case of undercharge. you said 43 psi while idling...can you try to rev it up a little bit and watch the suction pressure how low it would go down?..if it would go below 20 psi then you could be just low on gas or you do have a clogged orifice tube. that why i need to know your hugh pressure too in order to duagnose your problem more accurately.



    tnx again,



    drcool



  • francis rivero Jul 21, 2008

    hello again bmcgyver,

    you have not measured the high side pressure yet? i hope it would help me better to solve your problem. when your idling, the 43 psi reading at the suction side does not trip your low pressure switch or sometimes they call it th clutch cycling switch to prevent icing up of the evaporator. but if you are running, the suction pressure could go down to below 20 psi and the outlet of the orofice tube would start to ice up. this would trigger the pressure switch and cut off the compressor. after waiting for a ew minutes, the pressure woud go up to 70 psi or more and it would trigger the the pressure switch to cut in to turn on the compressor. that is the first scenario i am thingking of. if that it the case, it could either be a lack of charge or a clogged orifice tube.



    the other scenario i am thingking is that you have a high pressure building upin the condenser due to many reasons, one reason could be a clogged orifice tube, another is lack of cooling air to cool the condenser . this time, the HIGH pressure switch is the one cutting off the compressor, not the low pressure switch. if the condenser pressure reaches beyond 300 psi, the high pressure switch would cut out and cut the power to the compressor. as the compressor stops, the pressure would slowly go down until it reach 200 psi and then the high pressure switch would cut back in and run the compressor again.



    but at idling, everything looks like normal and the unit is cooling.



    please record the high pressure durng idling and while reving up.



    tnx,

    i hope i was able to solve your problem.



    drcool

  • francis rivero Jul 26, 2008

    hello again mcgyver,



    when you replace the orifice tube, be sure to flush the evaporator because sometimes, oil accumulates inside the evaporator and create some more problems, then pressure test it first to 150 psi then vaccum the su=ystem completely before charging it . if you could but those adaptors to fit your high side fitting so that it would help me a lot if i would know what are the pressures while idling and while reved up both high side and low side...



    pls keep us posted...



    tnx again



  • francis rivero Jul 26, 2008

    another thought came up to me...it could be your thermostat attached to your evaporator,,,you have already shorted the low and the high pressure switch and still it does that, cutting power to the compressor while running on the road...what about if the thermostat is defective and as it cools down it would trigger the thermostat but it wont cut in right away ...please heck your mechanical thermostat...



    again.



    keep us posted..



    drcool

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When it kick of if you hit the cluch of compressor with anything you got does the compressor start you might have a weak coil when it get warm it not strong enought to keep the cluch ingauge hope it help pierre

Posted on Jul 19, 2008

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