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A/C Diagnostics 700

posted by  ghas on  Tue Sep 9 15:07 CST 2014
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last visit: Wed Oct 15 12:27 CST 2014
[RELATED]

My 1991 740 has a full R12 charge and the A/C worked great until a few days ago when the compressor started to only run sporadically. The OBD test guide states there should be a 1-1-4 code when pressing the A/C control on and off. This code does not appear, just a rapidly blinking red light. I ran the same test on my '91 240 and got the 1-1-4 code. Is there a list of components that I should check out such as the low pressure switch or any other electrical components? I would like to test the most likely causes first before I take apart the dashboard to access the controller.






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