Well, easier said than done as cleaning the contacts entail disassembly
of the whole dash to get at the blower.  If you went that far I would
replace the blower with a new one.  I recently did that and at the same
time did clean and/or replace a lot of the spade connectors so hopefully
it'll keep things going a few years without problems.  We'll see.

>Would it be helpful to clean the contacts on the heater blower itself
>including the ground?
>Perhaps 15yrs of oxidation on the terminals may be causing some resistance.
>
>doug