I now have my first 850 model. but have owned 740 and 240 models in the past. My AC compressor
does not start, I have jumpered the switch on the low pressure line near the firewall with no luck.
I would really appreciate any thoughts from forum members from where to check now. Relays?
Any other wires to jumper? I have replaced the condenser so there is no refrigerant in the system at all
ChuckM
95 850
98 Cross Country

 

IIRC, there is a minimum amount of freon (in pressure) to have the compressor turn on. Without freon, it will never run. - AB

 

My Haynes manual mentioned jumpering the wires to override low pressure switch. I will
go ahead and put some 134a in the system anyway...Thanks.

 

Jumping the low pressure switch should turn the compressor on whether or not it has Freon. (Not reccomended without freon though)

Make sure when you jump it you get power to the compressor.

 

....and make sure to buy a can of R134a that has lubricating oil already mixed in it too,

Good luck,


JPN

 

Can you all please let me where the jumping off the low pressure switch is? Any pictures would be appreciated. My A/C compressor does not comr on when I turn the *** to turn it on.

Thanks.

 

the low pressure sensor is on the ac line that runs from the firewall back into the compressor.

trace the line from the firewall - as I recall you'll see it over by the overflow container. pull off the connector and you can jumper with a paper clip.

 

Thank you very much for your help.
kind regards

 

You might check and make sure you have voltage at the low pressure switch on one leg and check the wiring diagram to see where the other leg should go to see if the voltage is getting there. I have jumped the wires right at the compressor to make sure the compressor turns on there but don't do it for long if the system is dry.