REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Audi A6 (1997 release)

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Audi
	A6
		General Information
		Operation of the vehicle
		Maintenance
		Engines
		Ignition, fuel injection and exhaust of gasoline engines
		The power supply system, and preheating the exhaust gases of diesel engines
		Lubrication System
		Cooling system
			Overview
			Technical data
			Coolant
			Thermostat petrol engines of 1.8 liters
			Thermostat petrol engines of 2.4 and 2.8 liters
			Thermostat 1.9 liter diesel engines
			Thermostat 2.5 liter diesel engines
				Withdrawal
				Setting
				Verifying thermostat
			Water Pump cars with petrol engines of 1.8 liters
			Water Pump cars with petrol engines of 2.4 and 2.8 liters
			Water pump diesel cars of 1.9 liters
			Water pump diesel cars of 2.5 liters
		Coupling
		Transmission
		The front wheel drive shafts
		Design features four-wheel drive transmission
		Suspension
		Wheels and tires
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		Brakes
		Body
		Heating and air conditioning
		Electrical
		Electric schemes

printable version

Verifying thermostat

Working positions of the valve thermostat

Fig. 7.23. Working positions of the valve of the thermostat: a - the valve is closed; b - the valve is opened

Measure the length of a closed thermostat (Fig. 7.23).

Check the operation of the thermostat, you can: hang it on a string in a glass vessel filled with water, and heat the water to a boil. When boiling water thermostat valve should open. If the valve does not open, the thermostat is faulty and should be replaced.

The temperature of the thermostat valve opening is applied to the unit.

When the thermostat is heated to the boiling point of water the length of opening of the thermostat valve open b must be greater than the length of a closed valve and a 7 mm (see. Fig. 7.23).

The thermostat valve is not closed when the cooling water has to be replaced.

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Water Pump cars with petrol engines of 1.8 liters