Yes. The R-33/36 MLs (mainly on the 6) got them first in 1977, followed by the R-33/36WF cars on the 7, which also were repained in the MTA corporate color scheme at the time. Then they worked them way down to the R-29s and the R-26/28.
The R-26 through R-36s did have slightly better blowers on their fans before than (definitely better than the R-15s), so they were usually a little cooler than the R-12 through R-22s, but not that much. The reverse was true on the B Division -- the newer the non ACed cars, the hotter they seemed to be, and nothing on the planet was hotter than an R-40 4150-4349 during the summer.