111F ambient the fans don't run from ECT alone. they run and ramp based on AC demand. VAGCOM Engine Output Test yields Both Fans work and ramp as requested by the VCDS program. So where the hell does the ECM get its engine temp from to run the fans? Is there some way to adjust at what temp the fans come on? is the 2 wire sensor in the Thermostat Housing the source for the ECM to measure the ECT and drive the fans? what is the second temperature value found in the freeze frame data (66.0C) below?
Address 01: Engine (4F1 910 552 A)
20:55:29 Group 004
640 /min RPM
12.596 V Voltage
96.0°C Temperature
66.0°C Temperature
Address 08: Auto HVAC (4F0 910 043 A)
20:35:34 Group 022: Radiator Fans
56.8 % Radiator Fans (V7) Request
66.0 % Radiator Fans (V7) Feedback
7.0 Air Quality Sensor (G238)
20.0 Fresh/Recirculated Air Request
20:35:34 Group 019: Temperatures III
34.0°C Dash Panel (G56) Temperature
2760 /min Temp. Sensor Blower Speed
94.0°C Coolant Temperature
ON Idle Speed Increase Request
Address 01: Engine (4F1 910 552 A)
20:55:29 Group 004
640 /min RPM
12.596 V Voltage
96.0°C Temperature
66.0°C Temperature
Address 08: Auto HVAC (4F0 910 043 A)
20:35:34 Group 022: Radiator Fans
56.8 % Radiator Fans (V7) Request
66.0 % Radiator Fans (V7) Feedback
7.0 Air Quality Sensor (G238)
20.0 Fresh/Recirculated Air Request
20:35:34 Group 019: Temperatures III
34.0°C Dash Panel (G56) Temperature
2760 /min Temp. Sensor Blower Speed
94.0°C Coolant Temperature
ON Idle Speed Increase Request