coolant glow plugs

i have 98 jetta tdi. noticed metal strip fuse blown located on firewall near master cylinder.i assume this fuse is for coolant glow plugs. my question is could low coolant level cause glow plugs to overheat and blow the fuse?

No, I don't think low coolant would cause a problem. The relays do fail. I don't sell a lot of them, but from time to time I'll have a small run on them.