Cadillac 2010 STS, Owner'S Manual

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Checking Coolant
The vehicle must be on a level surface when checking
the coolant level.
The coolant surge tank and pressure cap are located on
the driver's side of the vehicle, toward the rear of the
engine compartment. See
Engine Compartment
Overview on page 6 ‑ 13 for more information on
location.
Check to see if coolant is visible in the coolant surge
tank. If the coolant inside the coolant surge tank is
boiling, do not do anything else until it cools down.
If coolant is visible but the coolant level is not at or
above the FULL COLD/FROID line, add a 50/50 mixture
of clean, drinkable water and DEX-COOL
®
coolant at
the coolant surge tank, but be sure the cooling system
is cool before this is done.
When the engine is cold, the coolant level should be at
or above the FULL COLD/FROID line on the side of the
coolant surge tank. Follow the arrow from the top of the
tank down the side to the horizontal mark. If it is not,
there could be a leak in the cooling system.
If the coolant is low, add the coolant or take the vehicle
to a dealer/retailer for service
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