Loose connector at blower motor resistors would give symptom you describe. These resistors and the blower speed switch were the subject of an extended warranty by Ford. Check your car's VIN at dealer, perhaps resistors were replaced and connector was not properly snapped in place.
W/W pump motor possibly faulty. Best to first check for volts at motor connector, when washer activated, to confirm wiring ok. Motor should be available from auto parts store.
