Just had to replace one for my daughter's 85 T/A. In the GP Sorensen line, the FS6 has the fan come on at 220* and off at 204*, FS4 is 227*-211*, and the FS1 is 238*- 222*. The FS1 was in stock at Advance Auto, the others had to be ordered.
Put the FS1 in her car, fan came on at around 240*...