There were a number of 1989 Southwest Tour events held during the 1989 season entitled the "Coors 100." Did you mean:

1989 Coors 100 (Stockton)-Dan Press wins an April race held at Stockton

OR

1989 Coors 100 (Orange Show)-Mark Meech picks up his only career victory with a triumph at San Bernardino

OR

1989 Coors 100 (Cajon)-Roman Calczynski wins his final race of the year with an October triumph at Cajon