2021-2026 Seat Leon 4 Door Practical tips -> Cooling system User Manual
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Practical tips -> Cooling system for Your Seat Leon 4 Door Fourth Generation (2021-2026)

Checking and refilling levels  
increased, but only up to 60 %; otherwise an-  
tifreeze protection will diminish and this will  
worsen cooling.  
Engine oil change  
For the sake of the environment  
We recommend that you change the en-  
gine oil and the filter at a technical service  
centre.  
We recommend that you have the engine oil  
changed by a Technical Service.  
When the coolant is topped up, use a mixture  
of distilled water and at least 40 % of the  
additive G12evo for optimal protection  
against corrosion. Mixing G12evo with G13  
(TL-VW 774 J), G12 plus-plus (TL-VW 774 G),  
G12 plus (TL-VW 774 F), G12 (red) or G11  
(green blue) engine coolants decreases pro-  
tection again corrosion and should be avoi-  
ded.  
Never pour oil down drains or into the  
ground.  
WARNING  
Only change the engine oil yourself if you  
have the specialist knowledge required!  
Use a suitable container when draining  
the used oil. It must be large enough to hold  
all the engine oil.  
Before opening the bonnet, read and ob-  
serve the warnings page 326.  
›››  
Wait for the engine to cool down. Hot oil  
may cause burn injuries.  
Cooling system  
Wear eye protection to avoid injuries,  
WARNING  
such as acid burns, caused by splashes of  
oil.  
If there is not enough anti-freeze in the  
coolant system, the engine may fail lead-  
ing to serious damage.  
Coolant specifications  
When removing the oil drain plug with  
The engine cooling system is supplied from  
the factory with a specially treated mixture of  
water and at least 40 % of the additive  
G12evo (TL-VW 774 J), purple. This mixture  
gives the necessary frost protection down to  
-25°C (-13°F) and protects the light alloy  
parts of the engine cooling system against  
corrosion. It also prevents scaling and con-  
siderably raises the boiling point of the cool-  
ant.  
your fingers, keep your arm horizontal to  
help prevent oil from running down your  
arm.  
Ensure that the percentage of additive is  
correct for the lowest expected ambient  
temperature in the zone in which the vehi-  
cle is to be used.  
Wash your skin thoroughly if it comes into  
contact with engine oil.  
When the outside temperature is very  
low, the coolant could freeze and the vehi-  
cle would be immobilised.  
Engine oil is poisonous! Used oil must be  
stored in a safe place out of the reach of  
children.  
CAUTION  
CAUTION  
To protect the cooling system, the percent-  
age of additive must always be at least 40 %,  
even in warm climates where anti-freeze pro-  
tection is not required.  
The original additives should never be  
mixed with coolants which are not ap-  
proved by SEAT.  
No additives should be used with engine oil.  
This could result in engine damage. Any  
damage caused by the use of such addi-  
tives would not be covered by the factory  
warranty.  
If the fluid in the expansion tank is not  
purple but is, for example, brown, this indi-  
cates that the G12evo additive has been  
If for weather reasons further protection is  
necessary, the proportion of additive may be  
»
333  
Practical tips  
2
Coolant expansion tank for the high-volt-  
age cooling circuit. Do not continue driv-  
ing if there is a lack of fluid in the expan-  
sion tank. Do not top up coolant. Go im-  
mediately to a specialised workshop.  
mixed with an inadequate coolant. The  
coolant must be changed as soon as possi-  
ble if this is the case!  
For the sake of the environment  
Coolants and additives can contaminate  
the environment. If any fluids are spilled,  
they should be collected and correctly dis-  
posed of, with respect to the environment.  
Refilling coolant  
Fig. 234 Engine compartment: coolant expan-  
sion tank cap.  
Coolant tank  
The coolant tank is located in the engine  
3 Valid for: hybrid vehicles.  
compartment page 329.  
›››  
Top up coolant when the level is below the   
(minimum) mark.  
Checking coolant level  
Fig. 233 In the engine compartment: marking  
on coolant expansion tank.  
Park the vehicle in a horizontal position.  
Switch the ignition off.  
Read off the coolant level on coolant ex-  
pansion tank. When the engine is cold, the  
coolant level should be between the marks  
Fig. 232 Engine compartment: Coolant tanks  
Fig. 233. When the engine is hot, it may  
›››  
be slightly above the upper mark.  
The vehicle has 2 independent coolant ex-  
pansion tanks.  
Topping up coolant  
Fig. 232  
›››  
Wait for the engine to cool down.  
1
Coolant expansion tank for the combus-  
tion engine cooling circuit.  
334  

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