Two things, have your mechanic test the fan resistor, it may have blown casing your fans to not come on which could account for the slight temp increase. Second, if your not going to do a full disassembly to clean out the radiators (see below) then don't bother with the blower as mentioned above. It will do nothing except, well, blow a bunch of air.
Check out this previous thread on cleaning out the radiators:
How much dirt could really be in there?
a lot of debris can collect in there:
