Sorry, no help here, just dire predictions from me. I have a 2000 XLT
with 83K miles on it. I had the rear wiper replaced 2 times and now it
works intermittently just like yours. Sadly, it only seems to work
when it is NOT raining. Morever, the darn thing only get's half the
window when it does work.
If anyone knows the secret, please let us know.