1998 Gmc Sierra Stored Van Over Winter Garage Fluid Leaked Out Over Rad

When I stored my van over winter in the garage fluid leaked out all over. The rad resorvoir bottle is emply as well. there appears to be some fluid left in the rad. There is also a pink color to this fluid. Prior to storage, every time I took the van out I have to refill or top up rad resorvoir bottle. Any suggestions or direction. thx Jackie