Refining major discoveries after P201500
BurgessHugh 
8 Connected to the above, the air intake flap cannot work normally due to insufficient vacuum, resulting in the air intake flap position sensor reporting P201500. In the past few days, I have always felt that there are only two sources of the vacuum pipe in the cylinder head. One is the solenoid valve for the heating water valve, and the other is the solenoid valve for the air intake flap. Because the vacuum intake flap solenoid valve can work normally through the intake manifold, it means that the leak occurs on the heater water valve solenoid valve side
This is the B8 Q5 warm air valve Vacuum control and air inlet flap work in a similar manner
rear view
This is the direction of the water flow. Remember, because we’ll talk about it later.
When the vacuum valve is not vacuuming, both ends of the water valve are open
Remove the back shell of the control valve to see the linkage mechanism
Pulling down the connecting rod is equivalent to opening the vacuum below
At this time, the pipeline is disconnected That is to say, before the engine temperature reaches the normal operating temperature or if the heater is not turned on This valve is always in operation That is, the vacuum state However, due to valve leakage, the intake manifold flap did not have enough negative pressure to open
This is the control solenoid valve for the heating water valve One end is connected to cylinder head vacuum and the other end is connected to warm air water valve
Called the parts dealer Said this valve fails frequently It was either leaking or leaking, and the idea of modification came up. This is the heating water valve used on the B9 and C7. Obviously popular designers took this into account Therefore, the vacuum valve and the control solenoid valve are directly made into an integrated pipeline and directly controlled by the solenoid valve to reduce the risk of air leakage. As for whether there will be leaks, we can only see later
Found an air nozzle and shorted the vacuum tube Cylinder head vacuum tube single-run intake manifold flap prevents insufficient vacuum causing replica cannot be opened
This is a car photo of the new heating valve The water flow on the new valve also has arrows pointing Be consistent with the arrow on the old heater valve and never put it upside down. Since there is a designer’s reason for marking the arrow However, the plug of the new water valve and the solenoid valve plug of the old water valve are not universal. I will buy a plug tomorrow and connect it with it. I hope it can help my card friends. Thank you for watching
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