The pulse is normal. It's a test to determine if the fan is good. When the fan spins, it send a dc volt back to the dme to let it know that it has spun when the DME commanded it to turn on. You can get the X scan with BMW software and it will tell you if the fan is faulty.

Since the ac doesn't work when it is stationary, could be you are low on refrigerant. When you are moving the engine is spinning faster and thus, the compressor is also spinning fast. At idle the engine is only spinning at 700rpm.

You will need to get the low side and high side pressure readings and the ambient temp to determine what is the problem.

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2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD