What are the contents of the washer bottle, have you checked? If the fluid is plain water with no (or very little) additive the pump could be freezing up and that is a common cause of blown fuses. Customer feedback about when it blows is very useful in these situations. Got a funny feeling the wash wipe switch can cause this problem, is it a bi-directional pump (one way for front, the other for rear) or is it two seperate pumps? Shaun. ps. A little more info in your posts may help get more replies.