9.5
Adjusting the cooling system
As trailer operation puts greater demands on the engine cooling
system, the cooling system is upgraded, where technically pos-
sible, when the towing bracket is installed in the factory. This is
achieved by installing a more powerful or second cooling fan
and/or a larger cooler. Hot country versions of vehicles and/or
those with air conditioning systems have a more powerful en-
gine cooling system, but this system may not be sufficient for
towing.
When a towing bracket is retrofitted, the cooling unit should be
upgraded unless this has already been done at the factory. Oth-
erwise, a high engine load (e.g. mountains, high ambient tem-
peratures, high trailer load) could cause the cooling system to
overheat. In the event of an alteration, the parts in the Genuine
Parts catalogue must be used in the engine cooling system dur-
ing trailer operation. The work instructions in the relevant work-
shop manuals must also be observed.
The cooling system does not need to be upgraded if it is possi-
ble to guarantee that the engine is only exposed to moderate
stress, e.g.:
◆
The permissible gross combination weight is significantly un-
derrun
◆
No high ambient temperatures
◆
No long, steep inclines
◆
No high altitude journeys
In any case, the coolant temperature display must be carefully
monitored. If the needle in the display moves into the hot area,
the speed must be reduced immediately. A cool-down time must
also be allowed for if necessary. This involves the allowing the
engine to idle for approx. 2 minutes to prevent a build-up of
heat.
Note
◆
In vehicles with air-conditioning, the engine cooling system
can be relieved by switching off the air-conditioning. This al-
so improves the vehicle's start-up behaviour and makes it
safer to overtake.
◆
If, in exceptional cases, the cooling system does not need to
be upgraded, the seller must advise the buyer accordingly if
the vehicle is sold.
Installation instructions - Audi Q5 (80A) 2017 ► Fixed/mechanically removable towing
bracket with E-set (NAR),
Edition 01
22
9 Concluding operations