coolant temperature AUDI A4 1999 B5 / 1.G APB Engine Cooling System Components

19-5


13 -
Radiator fan thermoswitch (-F18-), 35 Nm
For electric fan
Switching temperatures: Stage 1on: 92...97 Coff: 84...91 C
Switching temperatures: Stage 2
on: 99...105 Coff: 91...98 C
14 -
Seal
Always replace
15 -
Drain screw Tightening torque: 10 Nm
16 -
Top coolant hose Secured to radiator with retaining clipCheck for secure seatingDiagram of coolant hose connections
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19-14


Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 01
7 -
Right coolant line From turbocharger to rear coolant line
8 -
Banjo bolt Tightening torque: 35 Nm
9 -
Coolant temperature sender (-G62-) For engine control moduleIf necessary, release pressure in cooling
system before removing Checking:
10 -
Retaining clip
Check for proper seating
11 -
To heat exchanger
12 -
Rear coolant line Diagram of coolant hose connections
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19-25

- Start engine and let it idle for about 10
minutes.

- Maintain an engine speed of about 2000 RPM
for about 5 minutes.

- Allow engine to run at idling speed until bottom
hose on radiator becomes hot.

- Check coolant level and top up if necessary.
When engine is at normal operating temperature
coolant level must be on max. mark, and
between min. and max. marks when engine is
cold.

Note:
When the engine is hot the cooling system is
under pressure. Carefully open filler cap on
expansion tank to release pressure before
starting repair work.

WARNING!

Hot steam can escape from the expansion
tank when the filler cap is opened. Cover the
filler cap with a cloth and remove it carefully.
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g and installin
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