Dealer should know, there are two high/low speed relays and one delay relay that you need. I dont see how they dont know what you mean, they must have a diagram.
i just called the buick dealership, it's $60.57 and it's going to take them three days to get it. i thought it would just be a 30 dollar part, but i guess not. i just wanted to replace it, the car is fine without it.
go online you can buy them much cheaper. I bought all three relays. fan delay cost $27 other two cost $9 each.
it came to $60 with shipping. took three days to get them.
the site was partsdirect.com or partsexpress.com I don't remember which one. give it a try can save 50% or more.