can you somehow build a little shelter that keeps direct sun off it, but allows airflow...i would be more worried about airflow even if the sun hits it then no airflow but sun shelter myself..just like electronics, it needs cooling..can you relocate to a shadier place.

ps- my pump is 8-10 yrs old and the motor always has been hot to touch with no failures (it's in a pool shed with ventilation, but even so, the shed gets very hot in the midday sun..90+)