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Jumping the Compressor?

 
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Gixxerking2004
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PostPosted: Mon Aug 22, 2011 9:38 am    Post subject:  Jumping the Compressor? Reply with quote

My car is low on freon so the compressor doesn't turn on. The haynes manual says to use the low pressure cycling switch to jump it and add freon. I think it says its on the low pressure line but can't find it so I seached NAIOA and Google but I haven't found what I need. Any info will be greatly appreciated
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04DetroitLS
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PostPosted: Mon Aug 22, 2011 10:45 am    Post subject:   Reply with quote

just jump it @ the 2 prong connector on the compressor...

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MISHNAH
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PostPosted: Mon Aug 22, 2011 1:41 pm    Post subject:   Reply with quote

There is no "switch", it is only a sensor that tells the PCM if there is enough pressure, and the PCM then commands the A/C Clutch Relay.

Start adding freon, it doesnt need much in order for the sensor to sense the pressure and the compressor will start running. Once the compressor is running, it will continue to suck in the remaining freon.

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kundog
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PostPosted: Mon Aug 22, 2011 10:25 pm    Post subject:   Reply with quote

If you have a scanner, it will tell you the system pressure HI/LOW sides (I think, my A/C is inop, have not checked into it), it will also show other data as well in the A/C system. Now I am sure if the pressure sensor went bad it would throw a code, but you do not mention one, so probably not the case...so MISHNAH suggests, start adding some refrigerant to it and see what happens. As far as just jumping the compressor clutch, I would advise not going that route, yes you may be able to make it work, but nothing was fixed; still need to find the root of the problem.
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PostPosted: Mon Aug 22, 2011 10:34 pm    Post subject:   Reply with quote

He wants to jump the compressor so it will turn on and take a freon charge (when the compressor runs, it will suck freon from the car into the system), not as a fix so he can use his A/C

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kundog
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PostPosted: Mon Aug 22, 2011 11:06 pm    Post subject:   Reply with quote

I get that now...I reread the first post...not sure how I missed that Embarassed
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MISHNAH
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PostPosted: Tue Aug 23, 2011 1:34 am    Post subject:   Reply with quote

bbengineer wrote:
He wants to jump the compressor so it will turn on and take a freon charge (when the compressor runs, it will suck freon from the car into the system), not as a fix so he can use his A/C

BBEngineer


The compressor does NOT need to be running in order to accept enough refrigerant to switch the sensor on!

The pressure of the refrigerant inside the can will put enough pressure in the system for the sensor to turn the compressor on naturally, which will then allow the compressor to suck in all refrigerant needed.

Attach the hose to the low-side connection, open the valves on the gauge set and the refrigerant can, and after 10-30 seconds the compressor will start on its own.

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