2005 SKODA OCTAVIA engine overheat

Instruments and Indicator/Warning Lights
14
Engine revolutions counter
The start of the red zone in the revolutions counter ⇒page 13, fig. 2
indicates the maximum permissible engine speed for all gears for an
engine which has been run in and operating at a normal temperature. You
should shift into the next higher gear before this red zone is reached, or
move the selector lever into position D if your car is fitted with an automatic
gearbox.
One should shift to the next lower gear at the latest when the engine is no
longer running smoothly.
Avoid high engine speeds during the running-in period ⇒page 221.
Caution
The needle of the revolutions counter must on no account move into the
red zone of the scale - risk of engine damage!
For the sake of the environment
Shifting up early helps you save fuel and reduce the operating noise of
your vehicle.
Coolant temperature gauge
The coolant temperature gauge ⇒ page 13, fig. 2 operates only when
the ignition is switched on.
In order to avoid any damage to the engine, please pay attention to the
following notes regarding the temperature ranges: Cold range
If the pointer is still in the left-hand area of the scale it means that the
engine has not yet reached its operating temperature. Avoid running at
high engine speeds, at full throttle and at severe engine loads.
The operating range
The engine has reached its operating temperature as soon as the pointer
moves into the mid-range of the scale. The pointer may also move further
to the right at high engine loads and high outside temperatures. This is not
critical provided the warning symbol
 in the instrument cluster does not
flash.
If the symbol
 in the instrument cluster flashes it means that either the
coolant temperature is too high or the coolant level is too low. Please
refer to the guidelines ⇒page 35, “Coolant temperature/coolant level ”.
WARNING
Pay attention to the warning notes ⇒page 248, “Working in the
engine compartment” before opening the bonnet and inspecting
the coolant level.
Caution
Additional headlights and other attached components in front of the fresh
air inlet impair the cooling efficiency of the coolant. There is then a risk of
the engine overheating at high outside temperatures and high engine
loads!
Fuel gauge
The fuel gauge ⇒page 13, fig. 2 only operates when the ignition is
switched on.
A1
A2
A3
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Automatic gearbox DSG157
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speed of the engine to be reached before engaging a drive position in the
selector lever.
WARNING
•Do not depress the accelerator when changing the position of
the selector lever if the car is stationary and the engine is running
- risk of accident!
•Never move the selector lever into position R or P when driving
- risk of an accident!
•If you are stopping at a hill (downhill section), never try to hold
the car stationary with the gear engaged by means of the “acceler-
ator”, this means by letting the cl utch slip. This can lead to over-
heating of the clutch. If there is a risk of overheating of the clutch
due to overload, the clutch is opened automatically and the vehicle
rolls backward - risk of accident!
•If you must stop at a slope, depress and hold the brake pedal,
so that you can prevent the vehicle from rolling back.
Caution
•The double clutch on the automatic gearbox DSG is equipped with an
overload protection. If you make use of the uphill function on a vehicle
which is stationary or driving slowly uphill, it will result in an increase of
thermal stress of the clutches.
•An overheating of the clutches can be detected by the flashing of the
selector level indicator and the “jerk” of the clutches, finally the clutches
are opened. The power transmission from the engine to the front wheels
is interrupted and as a result of this the vehicle can no longer be driven. If
the clutch opens automatically, depress the brake pedal, wait a few
seconds and only then continue driving.
Selector lever positions
The selector lever position you have engaged is shown in the information
display of the instrument cluster with the corresponding gear symbol high-
Fig. 141 Selector lever
Fig. 142 Information
display: Selector lever
positions
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Intelligent Technology
214
The ESP operates in combination with the ABS ⇒page 218, “Antilock
brake system (ABS)”. If there is a fault in the ABS system, the ESP also
does not operate.
The ESP warning light ⇒page 40 lights up in the instrument cluster when
there is a fault on the ESP.
Switching off
You can switch the ESP off and on again as you wish, by pressing the
button ⇒page 213, fig. 180 . The ESP warning light ⇒page 40 lights up in
the instrument cluster when the ESP is switched off.
The ESP should normally always be switched on. It may be good practice
in certain exceptional cases, such as when you wish to have wheel slip,
to switch off the system.
Examples:
•when driving with snow chains
•when driving in deep snow or on a loose surface
•when it is necessary to rock a car free when it has become stuck
then you should switch on the ESP again.
WARNING
It is also not possible for the E SP to overcome the physical limits
of the vehicle. Even if a vehicle fitted with ESP you should still
always adapt your style of driving to the condition of the road
surface and the traffic situation. This particularly applies when
driving on slippery and wet roads. The increased safety offered
must not tempt you to take greater risks than otherwise - risk of an
accident!
Note
•All four wheels must be fitted with the same tyres in order to achieve
problem-free operation of the ESP. Differing rolling circumferences of the
tyres can lead to an undesirable reduction in the engine output.
•Changes to vehicle (e.g. on engine, on the brakes, on chassis or other
assignment of tyres and wheels) can influence the function of the ESP
⇒ page 270, “Accessories, changes and replacement of parts”.
Electronic Differential Lock (EDL)*
The electronic differential lock prevents an individual
wheel from slipping.
Models fitted with ESP are equipped with electronic differential lock (EDL).
General
The EDL makes it much easier, and sometimes at all possible, to start off,
accelerate and climb a steep hill when the conditions of the road surface
are unfavourable.
Operating principle
The EDL is activated automatically, that is without any action on the part
of the driver. It monitors the speeds of the driven wheels with the aid of the
ABS sensors. Should only one drive wheel begin spinning on a slippery
surface there will be an appreciable difference in the speed of the driven
wheels. The EDL function brakes the slipping wheel and the differential
transmits a greater driving force to the other driven wheel. This control
process is also accompanied by noises.
Overheating of the brakes
The EDL switches off automatically if unusually severe stresses exist in
order to avoid excessive heat generation in the disc brake on the wheel
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Intelligent Technology217
Using the systemSafetyDriving TipsGeneral MaintenanceBreakdown assistanceTechnical Data
possible (by applying and releasing the brakes several times, if the road
conditions and the traffic situation allows it).
There also may be a certain delay before the full braking efficiency is
available when driving on roads which have been treated with road salt if
you have not used the brakes for some considerable time beforehand.
The layer of salt on the brake discs and brake pads must first be rubbed
off when you apply the brakes.
Corrosion
Corrosion on the brake discs and dirt on the bake pads occur if the vehicle
has been parked for a long period and if you do not make much use of the
braking system.
We recommend cleaning the brake discs by firmly applying the brakes at
a fairly high speed if you do not make much use of the braking system or
if surface corrosion is present
⇒.
Faults in the brake surface
If you notice that the braking distance has suddenly become longer and
that the brake pedal can be depressed further, it is possible that a brake
circuit of the dual-circuit brake system has failed. Drive, in such cases, to
the nearest specialist garage without delay in order to have the problem
rectified. Drive at a reduced speed while on your way to the dealer and
adapt your style of driving to the higher brake pedal pressure required.
Low brake fluid level
An insufficient level of brake fluid may result in problems in the brake
system. The level of the brake fluid is monitored electronically ⇒page 40,
“Brake system ”.
WARNING
•Only apply the brakes for the purpose of drying and cleaning the
brake discs if the traffic conditions permit this. Do not place any
other road users in jeopardy.
•When retrospectively mounting a front spoiler, solid wheel hubs
etc. one must ensure that the air supply to the front wheel brakes
is not reduced otherwise the braking system could run too hot.
•Allow for the fact that new brake pads do not achieve their full
braking efficiency until approximately 200 kilometres. New brake
pads must be first “run in” before they develop their optimal fric-
tion force. You can, however, compensate for this slightly reduced
braking force by increasing the pressure on the brake pedal. This
guideline also applies to any new brake pads installed at a future
date.
Caution
•Never allow the brakes to rub by applying slight pressure if you do not
wish to brake the vehicle. This causes the brakes to overheat and can also
result in a longer braking distance and excessive wear.
•Before negotiating a steep downhill section, please reduce your
speed, shift down into the next lower gear (manual gearbox) or select a
lower driving stage (automatic gearbox). This enables you to make full use
of the braking power of the vehicle and reduces the strain on the brakes.
Any additional braking should be done intermittently, not continuously.
Brake booster
The brake booster boosts the pressure which you generate with the brake
pedal. The necessary pressure is only generated when the engine is
running.
WARNING (continued)
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Towing a trailer231
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before negotiating a downhill section to allow the engine to also act as a
brake.
Engine overheating
Please keep a check on the coolant temperature gauge if you have to
negotiate a lengthy slope in a low gear at a high engine speed when the
outside temperature is very high
⇒page 14.
If the needle of the coolant temperature gauge moves into the right-hand
area or even the red area of the scale, reduce your speed immediately.
Stop and switch off the engine if the warning light
 in the instrument
cluster begins flashing. Wait a few minutes and check the level of coolant
in the coolant expansion bottle ⇒page 254, “Inspecting the coolant level”.
Please refer to the following guidelines ⇒page 35, “Coolant tempera-
ture/coolant level ”.
The coolant temperature can be reduced by switching on the heating.
Any increase in the cooling effect of the coolant fan through shifting down
a gear and increasing the engine speed is not possible since the fan
speed is independent of the engine speed. One should also not drop a
gear for this reason when towing a trailer as long as the engine can
manage the slope without any drop in speed.
Detachable ball head*
The detachable ball head of the towing device is stowed in a box for the
car tool kit in the spare wheel well in the luggage compartment.
An instruction for correct installation and removal of the ball head of the
towing device is supplied with the ball head
Inspect the ball head to ensure that it is properly locked each time before
setting off. The inspection is performed by turning the closed locking lever
downwards. If the locking lever can only be turned around a small angle
(approx. 5°), the locking mechanism is O.K. After the inspection pull the
locking lever back again to its stop. The towing device must not be used,
if it does not wish to close or the locking lever turns slightly in the closed
position.
Fig. 186 Detachable
ball head
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Fuel
246
Caution
•Remove any fuel which has spilled onto the paintwork of your vehicle
immediately - risk of paint damage!
•Vehicles fitted with catalytic converter should never be allowed to let
the fuel tank to run completely empty. An irregular supply of fuel to the
engine can result in misfiring and unburnt fuel may get into the exhaust
system, which may result in overheating and damage to the catalytic
converter.
For the sake of the environment
The fuel tank is full just as soon as the pump nozzle switches off for the
first time, provided the nozzle has been operated properly. You should not
continue refuelling - otherwise the expansion chamber in the fuel tank will
also be filled with fuel. Fuel might flow out of the tank when it heats up.
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Inspecting and Replenishing255
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recommend inspecting the coolant level directly at the reservoir from time
to time.
Loss of coolant
A loss of coolant is first and foremost an
indication of a leak in the
system. You should not merely top up the coolant in the reservoir. It is also
important to have the cooling system inspected without delay by a
specialist garage.
Losses can only occur through the pressure relief in the cap of the coolant
expansion bottle which is completely free of leaks if the coolant boils as a
result of overheating and is forced out of the cooling system.
WARNING
Read and observe the warning notes ⇒page 248, “Working in the
engine compartment” before working in the engine compartment.
Caution
One should contact a specialist garage as soon as possible if the source
of overheating itself cannot be determined and removed, since there may
be grave damage to the engine.
Replenishing the coolant
– Switch the engine off.
– Allow the engine to cool down.
– Place a cloth over the cap of the coolant expansion reservoir ⇒fig. 194 and unscrew the cap carefully by turning it to the
left ⇒ . – Top up the coolant.
– Screw the cap tight until it is heard to lock.
The coolant which you use for replenishing the system, must comply with
one specific specification
⇒page 253, “Coolant”. Do not use an alternative
additive if the coolant additive G12 PLUS is not available in exceptional
cases. Just top up the system with water and as soon as possible arrange
adjustment to correct the mixing ratio of water and coolant additive again
by a specialist garage.
Only use fresh coolant for topping up the system.
Do not fill up over the “MAX” marking! Excess coolant which is heated up
is forced out of the cooling system through the pressure relief valve in the
cap of the coolant compensation bottle.
Wait until the engine has cooled down for a system which has suffered a
major loss of coolant before pouring in coolant. This is necessary to avoid
engine damage.
WARNING
•The cooling system is pressurized! Do not open the cap of the
coolant expansion bottle if the engine is still hot - risk of scalding!
•The coolant additive and thus all of the coolant is harmful to
your health. Avoid contact with the coolant. Coolant vapours are
also harmful to the he alth. It is important, therefore, to always
safely store any coolant additive in its original container out of the
reach of children - risk of poisoning!
•If any splashes of coolant get into your eyes, rinse out your eyes
immediately with clear water and contact a doctor as soon as
possible.
•You should also consult a doctor without delay if you have inad-
vertently swallowed coolant.
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