Cadillac 1997 Eldorado Owner's Manual page 244

When you decide it's safe to lift the hood, here's what
you'll see:
A. Coolant Surge Tank with Pressire
Cap
B. Electric Engine Fans
,, . .
If
the
coolant inside the coolant surge tank is boiling,
&on"ido anything else
UntiI it cools down.