Audi Q7 Coolant Replacement and Bleeding Method
2 Answers
Audi Q7 coolant replacement and bleeding method is as follows: 1. In addition to a thick pipe connected to the radiator on the small tank, there is also a thin pipe. Remove this thin pipe, then start the engine. At this time, air will begin to be expelled from the thin pipe. 2. Coolant is an important substance in the cooling system, circulating in the radiator and carrying away engine heat through the pipes. It also has excellent properties such as preventing boiling in summer, rust removal, and corrosion prevention. Audi Q7 coolant replacement tutorial: 1. Let the vehicle sit for half an hour before replacing the coolant, as the coolant temperature is high immediately after the engine is turned off. Locate and loosen the coolant drain valve at the bottom of the radiator. Stop when no more coolant flows out from the drain port. 2. Keep the car idling. During this process, continuously add clean water to the reservoir to flush out residual coolant in the cooling system until the water coming out of the drain port is colorless, indicating that the old coolant has been mostly removed. 3. After the water stops dripping, close the drain valve and turn off the engine. Pour the new coolant into the reservoir, keeping the level between MAX and MIN. It's okay if the level is slightly above the MAX line. 4. Start the engine again and let it idle to further expel air from the cooling system pipes, causing the coolant level to drop slightly. 5. Once the level stabilizes, top up the coolant to between the two marks. The coolant replacement process is now complete.
The most crucial part of changing coolant is bleeding the air. When I last changed it on my Q7, the technician taught me a standard procedure: First, park the car on level ground when the engine is cold, remove the expansion tank cap on the left side of the front bumper (make sure the temperature has cooled down, otherwise it may spray), and turn the heater to the highest setting. Then, slowly drain the old fluid from the blue plastic drain screw at the bottom of the radiator. After it's completely drained, tighten the screw. Add new coolant up to the Max line on the expansion tank, start the engine and maintain it at 1500 RPM. You'll see bubbles forming and the fluid level dropping—keep topping it up until the level stabilizes midway between the markers. Finally, drive for about 20 minutes, then check the level again when the engine is cold. If the level hasn't changed, you've succeeded. Remember to use genuine G13 coolant and mix it with distilled water if needed.
