Air Con not cold - Advise required

[Ranju209]

Hi,

I drive a BMW X5 E53. My problem is the vent blows only warm air (depending on the outside temp). When I checked usig the knowledge what i got from reading different posts I found that the Clutch doesn't get engaged. When I unplug the sensor from the high pressure line (i have a 3 wire sensor) the Aux fan starts and as soon as i plug the sensor back it stops. But could never get the clutch engaged. Also what I would like to check now is to find the relay which switchs the clutch on/off and short it as per the video attached. (How To Make AC Ice Cold, Recharge air, and Force the Compressor Clutch to Engage - YouTube ).

Does anyone know where is the relay for the E53 located? And how to get to it. And is it the Final Stage Resistor in a BMW's case that acts as a relay?

Any help is much apprecieated.

Cheers

[Bulk]

My money is on the compressor - either it has shat itself or the clutch is not engaging.

And from your original picture question, the first plug is the only one that connects to the aux fan. If you jiggle the second one around you'll find it pops out and has no electrical connection to the aux fan at all - it is a sensor and is only clipped into the aux fan by plastic tabs

[upallnight]

If you could hook up one of those refill can of refrigerant with the gauge you can see what type of pressure you have in the system. I think that your system pressure is low thus activating the low pressure switch to prevent the compressor clutch from energizing. If the system pressure is below 1.5 bars the switch will be activated. You will connect the refill can to the low side of the system (Blue Cap). Search youtube video for refilling a system before performing this procedure.