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Thread: 2014 case maxxum 120 multi controller

  1. #1
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    2014 case maxxum 120 multi controller

    Air con not working, fan blows, blue light on switch is on but not cold, what needs doing? Iím no mechanic

  2. #2
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    Re: 2014 case maxxum 120 multi controller

    Quote Originally Posted by Richardrjr View Post
    Air con not working, fan blows, blue light on switch is on but not cold, what needs doing? Iím no mechanic
    Look for the wires into the compressor clutch (inside the pulley on the front) there could be one or two wires, a single should be just power and earth is through the compressor casing, two wires will mean one is power the other the return or earth wire. Now you know which is the power wire, unplug it/disconnect it so with the engine running you can apply 12v to the power wire into the clutch to test it.

    When you apply 12v the clutch should give a clunk sort of sound and with the engine running it start turning the compressor. Now feel the two pipes coming out of the other end of the compressor- the bigger pipe is ths suction and should get colder, the smaller pipe is the pressure side and will feel warm. If it feel cold then theres and electrical problem which can depending on the model just be pressure switches or other control gear, or even a fuse. Might be an easy fix.

    if there is no change in temperature then its possible that you have lost most or all of the gas in the system? or there is a major mechanical fault in the compressor and in this case it really needs someone qualified on air-con to come in and diagnose in more detail with pressure testing equipment.
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