2009 CADILLAC CTS Owners Manual

7. Pivot the air cleaner housing cover and remove the
cover from the air cleaner housing.8. Remove the air cleaner lter from the air cleaner
housing.
5-27

How to Reinstall Engine Air
Cleaner/Filter
1. Install the air cleaner into the air cleaner housing.
The outer air cleaner lter seal must be tted
properly in the air cleaner housing.
2. Align the air cleaner housing cover tabs to the air
cleaner housing.
3. Install the air cleaner housing cover.
4. Install the air cleaner housing cover screws.
5. Install the hose to the air cleaner housing mounting
arm. The hose must be routed correctly.
6. Install the air cleaner outlet duct to the air cleaner
housing.
7. Tighten the air cleaner outlet duct screw clamp.
8. Attach the electrical connector to the air box.
9. Reinstall the side cover.
{CAUTION:
Operating the engine with the air cleaner/lter off
can cause you or others to be burned. The air
cleaner not only cleans the air; it helps to stop
ames if the engine backres. If it is not there and
the engine backres, you could be burned. Do not
drive with it off, and be careful working on the
engine with the air cleaner/lter off.
Notice:If the air cleaner/lter is off, a backre can
cause a damaging engine re. And, dirt can easily get
into the engine, which will damage it. Always have
the air cleaner/lter in place when you are driving.
5-28

Automatic Transmission Fluid
How to Check Automatic Transmission
Fluid
It is not necessary to check the transmission uid level.
A transmission uid leak is the only reason for uid loss.
If a leak occurs, take the vehicle to the dealer/retailer
service department and have it repaired as soon as
possible.
There is a special procedure for checking and changing
the transmission uid. Because this procedure is
difficult, it should be done at the dealer/retailer service
department. Contact your dealer/retailer for additional
information or the procedure can be found in the service
manual. To purchase a service manual, seeService
Publications Ordering Information on page 7-15.Notice:Use of the incorrect automatic transmission
uid may damage the vehicle, and the damages
may not be covered by the vehicle’s warranty.
Always use the automatic transmission uid listed in
Recommended Fluids and Lubricants on page 6-14.
Change the uid and lter at the intervals listed in
Additional Required Services on page 6-6, and be sure
to use the uid listed inRecommended Fluids and
Lubricants on page 6-14.
Manual Transmission Fluid
It is not necessary to check the manual transmission uid
level. A transmission uid leak is the only reason for uid
loss. If a leak occurs, take the vehicle to a dealer/retailer
for service. Have it repaired as soon as possible. You
may also have the uid level checked by your dealer/
retailer when the oil is changed. SeeRecommended
Fluids and Lubricants on page 6-14for the proper uid
to use.
5-29

Hydraulic Clutch
It is not necessary to regularly check clutch uid unless
you suspect there is a leak in the system. Adding
uid will not correct a leak. A uid loss in this system
could indicate a problem. Have the system inspected
and repaired.
When to Check and What to Use
The hydraulic clutch uid
reservoir cap has this
symbol on it. SeeEngine
Compartment Overview
on page 5-14for reservoir
location.Refer to the Maintenance Schedule for the proper
uid to use. SeeRecommended Fluids and Lubricants
on page 6-14. The uid requires changing every
two years. SeeAdditional Required Services on
page 6-6.
How to Check and Add Fluid
Visually check the clutch uid reservoir to make sure
the uid level is at the MIN (Minimum) line on the side
of the reservoir. The hydraulic clutch uid system should
be kept closed and sealed. Do not remove the cap to
check the uid level or to top-off the uid level. Remove
the cap only when necessary to add the proper uid
until the level reaches the MIN line.
5-30

Cooling System
The cooling system allows the engine to maintain the
correct working temperature.
When you decide it is safe to lift the hood, here is what
you will see:
A. Electric Engine Cooling Fan(s) (Out of View)
B. Coolant Surge Tank and Pressure Cap{CAUTION:
An electric engine cooling fan under the hood can
start up even when the engine is not running and
can cause injury. Keep hands, clothing, and tools
away from any underhood electric fan.
{CAUTION:
Heater and radiator hoses, and other engine parts,
can be very hot. Do not touch them. If you do, you
can be burned.
Do not run the engine if there is a leak. If you run
the engine, it could lose all coolant. That could
cause an engine re, and you could be burned.
Get any leak xed before you drive the vehicle.
Notice:Using coolant other than DEX-COOL
®can
cause premature engine, heater core, or radiator
corrosion. In addition, the engine coolant could
require changing sooner, at 30,000 miles (50 000 km)
or 24 months, whichever occurs rst. Any repairs
would not be covered by the vehicle warranty.
Always use DEX-COOL
®(silicate-free) coolant in
the vehicle.
5-31

Engine Coolant
The cooling system in the vehicle for all engines and
the intercooler is lled with DEX-COOL®. This coolant is
designed to remain in the vehicle for ve years or
150,000 miles (240 000 km), whichever occurs rst.
The following explains the cooling system and how to
check and add coolant when it is low. If there is a
problem with engine overheating, seeEngine
Overheating on page 5-37.
What to Use
{CAUTION:
Adding only plain water to the cooling system can
be dangerous. Plain water, or some other liquid
such as alcohol, can boil before the proper coolant
mixture will. The vehicle’s coolant warning system
is set for the proper coolant mixture. With plain
water or the wrong mixture, the engine could get
too hot but you would not get the overheat
warning. The engine could catch re and you or
others could be burned. Use a 50/50 mixture of
clean, drinkable water and DEX-COOL
®coolant.Use a 50/50 mixture of clean, drinkable water and
DEX-COOL
®coolant. If using this mixture, nothing else
needs to be added. This mixture:
Gives freezing protection down to−34°F (−37°C),
outside temperature.
Gives boiling protection up to 265°F (129°C),
engine temperature.
Protects against rust and corrosion.
Will not damage aluminum parts.
Helps keep the proper engine temperature.
Notice:If an improper coolant mixture is used, the
engine could overheat and be badly damaged. The
repair cost would not be covered by the vehicle
warranty. Too much water in the mixture can freeze
and crack the engine, radiator, heater core, and
other parts.
Notice:If extra inhibitors and/or additives are used
in the vehicle’s cooling system, the vehicle could
be damaged. Use only the proper mixture of
the engine coolant listed in this manual for the
cooling system. SeeRecommended Fluids and
Lubricants on page 6-14for more information.
5-32

Checking Coolant (CTS)
The vehicle must be on a level surface when checking
the coolant level.
The engine coolant reservoir is located in the engine
compartment on the driver side of the vehicle. See
Engine Compartment Overview on page 5-14.
Check to see if coolant is visible in the surge tank.
If the coolant inside the 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
mark, 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. SeeEngine Coolant on page 5-32for more
information.
If the engine is warm or hot, the coolant level should be
at or above the FROID/FULL COLD line on the side
of the coolant surge tank. If the engine is cold, the
coolant level should be near the FROID/FULL COLD
line on the side of the coolant surge tank. If it is
not, there could be a leak in the cooling system.
How to Add Coolant to the Surge Tank
{CAUTION:
You can be burned if you spill coolant on hot
engine parts. Coolant contains ethylene glycol
and it will burn if the engine parts are hot enough.
Do not spill coolant on a hot engine.
Notice:This vehicle has a specic coolant ll
procedure. Failure to follow this procedure could
cause the engine to overheat and be severely
damaged.
{CAUTION:
An electric engine cooling fan under the hood can
start up even when the engine is not running and
can cause injury. Keep hands, clothing, and tools
away from any underhood electric fan.
5-33

{CAUTION:
Steam and scalding liquids from a hot cooling
system can blow out and burn you badly. They are
under pressure, and if you turn the surge tank
pressure cap — even a little — they can come
out at high speed. Never turn the cap when the
cooling system, including the surge tank pressure
cap, is hot. Wait for the cooling system and surge
tank pressure cap to cool if you ever have to turn
the pressure cap.
If coolant is needed, add the proper DEX-COOL
®
coolant mixture at the coolant surge tank.If no coolant is visible in the surge tank, add coolant as
follows:
1. Remove the coolant surge tank pressure cap when
the cooling system, including the coolant surge tank
pressure cap and upper radiator hose, is no longer
hot. Turn the pressure cap slowly counterclockwise
about one-quarter turn and then stop.
If you hear a hiss, wait for that to stop. A hiss
means there is still some pressure left.
2. Then keep turning the pressure cap slowly and
remove it.
5-34