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Possible to bypass A/C compressor shutting down?


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7 replies to this topic

#1 gregorysg09

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Posted 03 August 2014 - 01:29 PM

Hoping someone knows if is possible to disable the intermittent shut down of the A/C compressor on my 2001 SUBARU LEGACY, I have multiple sclerosis, and cannot tolerate this while driving.
Hoping to get a way to do this, SOON.

#2 Legacy777

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Posted 03 August 2014 - 04:43 PM

Welcome to the USMB.

 

The A/C compressor cycling is unfortunately normal.  It can however may be minimized by ensuring the proper refrigerent charge is in the system.  Does the air heat up too much?  Are you using the fresh air or recirculating setting?



#3 Fairtax4me

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Posted 03 August 2014 - 08:35 PM

The compressor stops running for two main reasons.
One is because the pressure in the system gets too low.
The other is when the evaporator core gets too cold. The compressor will be shut off to prevent icing of the evaporator. The compressor will cycle much more often due to this if you have the control head set to recirculate, but the air should still be COLD since the air moving across the evaporator core will be pulled from inside the car.
If the compressor is cycling and the air is not cold, the charge is probably too low.

On newer vehicles the control module will stop the compressor if the throttle is wide open, or if the steering wheel is turned more than a certain amount when the vehicle is sitting still or moving very slowly. Neither of these will apply if the compressor is cycling while driving at a steady speed.

#4 Legacy777

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Posted 06 August 2014 - 12:05 PM

On newer vehicles the control module will stop the compressor if the throttle is wide open, or if the steering wheel is turned more than a certain amount when the vehicle is sitting still or moving very slowly. Neither of these will apply if the compressor is cycling while driving at a steady speed.

 

Is the reason the compressor turns off if the wheel is turned past a certain amount due to reducing load on the engine?  I've never heard of it.



#5 Fairtax4me

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Posted 06 August 2014 - 04:19 PM

Is the reason the compressor turns off if the wheel is turned past a certain amount due to reducing load on the engine? I've never heard of it.


That is exactly why. Reduce engine load and there-by reduce emissions.

It's usually just done with a hydraulic pressure switch on the power steering pressure line.

#6 Mr.Atlantis

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Posted 06 August 2014 - 06:17 PM

That is exactly why. Reduce engine load and there-by reduce emissions.

It's usually just done with a hydraulic pressure switch on the power steering pressure line.

 

This also explains the sudden drop in RPM sometimes when I cock the wheel too quickly and/or to it's extreme limits.



#7 Legacy777

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Posted 07 August 2014 - 02:40 PM

That is exactly why. Reduce engine load and there-by reduce emissions.

It's usually just done with a hydraulic pressure switch on the power steering pressure line.

 

I'm all for not polluting the planet, but something like this seems pretty ridiculous.



#8 Fairtax4me

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Posted 07 August 2014 - 05:00 PM

I'm all for not polluting the planet, but something like this seems pretty ridiculous.


It is, no doubt. Just another way for manufacturers to claim X% of emissions reduction to help satisfy tighter EPA standards. With the recent push toward electricity, most new (2012+) cars now have electric assist power steering. Most of which actually eliminate the hydraulic component altogether.
There are also electrically driven AC compressors.

Fine and dandy until the wires get corroded.




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