For various reasons, air can enter the cooling system of the Audi engine and accumulate in the area of the heater radiator. Because of this, the engine can start to overheat even in normal driving conditions, starting the engine becomes difficult, the heating system reduces the efficiency of heating the passenger compartment. You can eliminate the malfunction without resorting to the specialists of the service center.
Necessary
- - coolant;
- - tank for collecting coolant;
- - assistant
Instructions
Step 1
Raise the front of the vehicle to a height of 250-400 mm. This can be done by hanging the front wheels with a lift, or by driving them onto an overpass, hill, curb, etc. This condition is not necessary, but it is desirable, since if the filler neck of the radiator is located above the heater radiator, the cooling system is better filled with liquid.
Step 2
Open the radiator filler neck and bleed plugs. The location of these plugs may differ depending on the Audi model, but most often they are installed to the right of the filler neck and on the thermostat housing. Examine the plugs carefully. If there is mechanical damage to them, replace them with new ones.
Step 3
Switch on the ignition without starting the engine. Set the heater control knobs to the maximum air temperature, and its fan to the minimum speed. In this position, the heater valves will open to the maximum angle, the booster pump will start to work. The temperature of the coolant according to the thermometer on the instrument panel should be no more than 60 degrees.
Step 4
Start pouring coolant into the radiator filler neck with a small stream. In this case, from the open bypass holes, it will pour out of the cooling system along with air bubbles. Place containers for collecting liquid under these holes in advance. As soon as the liquid flowing out of the system goes without air bubbles, immediately close the bypass plugs and pour liquid into the cooling system up to the cutoff of the radiator filler neck. If your Audi model has a priming pump installed on the radiator shroud, wait 5-7 minutes so that it has time to pump fluid throughout the system.
Step 5
It is advisable to perform the next stage with an assistant. Start the engine and keep its speed in the region of 2500-3500 rpm. As soon as a strong, dense and stable stream of liquid comes out of the radiator bypass hole, tighten the filler neck with a plug. Check the air temperature coming from the heater air ducts. If the engine is cold, warm it up by setting the speed in the region of 4000-4500 rpm. Hold these revolutions until the engine warms up and the heater starts to supply equally hot air from all deflectors.
Step 6
To check the opening of the thermostat, place your hand on its liquid outlet pipe at the bottom of the radiator. As soon as the thermostat opens, the pipe begins to heat up. When the temperature of both nozzles equalizes, then the thermostat is fully open. After waiting for this moment, stop the engine and let it cool down. Check the coolant level and top up if necessary.
