Replaced the A/C compressor clutch and bearing on my 1991 Sedan Deville in late June of this year. This weekend my "Service Air Cond" warning light came on and I no longer can turn on the A/C. The codes I'm able to pull are E91, E98 and F11, F47 - then it reads F.F and F11 & F47 repeat. Don't know if there's any connection but I found I hadn't replaced the cap on the coolant resovoir last time I topped it up. Cleared the codes and the A/C worked for a day or two but didn't seem to be as cool as normal.

1. What do these codes mean?
2. Which are current/history?
3. Where can I get a listing of all of the E & F codes and any others that might be applicable to my '91 along with complete instructions to delve deeper into the OBD ( I can see there's more but I'm hesitent to randomly push buttons!)

Thanks much

 

Info at: http://myweb.accessus.net/~090/dtcobd1.html#tro
should help. Looks like info on your code F11 is listed as A011
and E91 as P091