Hi,
The wiper linkages are a common failure. You can either replace them with standard second hand parts from somewhere like ebay, use a repair clip, or upgrade the linkages to wipex linkages. Sometimes you can get away with squashing the plastic bush at the end of the linkage with a pair of pliers to give you a bit more time.
Re your heater fan.... Do your sidelights come on instead of the fan when you turn the fan control nob?(strange I know) Does it not work on all 4 speeds or just some?
Alan