sgreen

i have a 91 ls 400 which is blowing warm air. i did the test by pressing AUTO and REC. i saw two codes, 21 and 88. i understand about the 21, but does anyone know what the 88 means? Also, i read in prior posts about two electric fans coming on. are these the fans that are closer to the engine or the ones behind the grill. the A/C worked fine last year. the only work performed under the hood was the 85K service and also the battery was replaced during winter. thanks in advance for any help. sg