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1.4 Engine cooling system
Engine
Engine
The cooling system is used to control the engine temperature. The heat generated during
combustion is dissipated to the environment in a controlled manner via three radiators
arranged in the front end, thereby protecting the combustion engine against overheating.
The cooling system also has two oil/water heat exchangers. Both the heat exchanger for
the engine and the heat exchanger for the transmission bring the oil temperatures of the
respective units to operating temperature and maintain them there. There is a pressure
relief valve fitted in the cap of the expansion tank that opens above an overpressure of 1.4
bar (203 psi) (max. volume flow 3L/min.) The system must be checked if it is losing coolant
or a leak is suspected. Hazet provides a tester for this that pressurizes the cooling system
in order to locate any possible leakage. The adapter required for the test, which must be
screwed onto the expansion tank, can also be purchased from Hazet.
Adapter:
Hazet 4800-12A
1.4.1 Schematic diagram
1.4.1.1
1.4.2 Thermostat
The thermostat installed in the engine opens above a water temperature of 81°C
(178°F). The thermostat is fully open above approx. 95°C (203°F).
911 GT3 Cup (991 II)
Version: 4/20/2018
22
MY 2018
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