do you have a picture of where the water is coming in? Slider or fixed (stationary) window? Windshield or side window?
Your question is quite common, would be helpful to know if it is leaking between the frame and fiberglass, or between the glass and the aluminum frame. Most often a glass shop or windshield shop can help, but knowing where is the first step.
This reply is
@Corey_lax approved, one of a number of knowledgeable Glaziers on the forum.