Cadillac 2000 Catera Owner's Manual page 227

NOTICE:
When adding coolant, it is important that
-
you use only DEX COOL
If coolant other than DEX
to the system, premature engine, heater core or
radiator corrosion may result. In addition, the
engine coolant will require change sooner
30,000 miles (50 000 km) or 24 months,
whichever occurs first. Damage caused by the
use of coolant other than DEX
covered by your new vehicle warranty.
5-14
R
-
(silicate free) coolant.
-
COOL is added
--
at
R
-
COOL is not
If there seems to be no leak, with the engine on, check to
see if the electric engine cooling fans are running. If the
engine is overheating, both fans should be running.
If they aren't, your vehicle needs service.
How to Add Coolant to the Coolant
Surge Tank
If you haven't found a problem yet, but the coolant level
isn't at the KALT/COLD line (seam), add a 50/50
mixture of clean, drinkable water and DEX
coolant at the coolant surge tank, but be sure the cooling
system, including the coolant surge tank pressure cap, is
cool before you do it. (See "Engine Coolant" in the
Index for more information.)
R
-
COOL