Bimmerfest BMW banner

1 - 3 of 3 Posts

·
Registered
Joined
·
1 Posts
Discussion Starter #1 (Edited)
No A/C... I have changed the coolant temp sensor, A/C pressure sensor. While charging the system, my low side pressure continues to climb near 120 psi, (and the high side matches); however the clutch never engages to cycle the coolant. I have checked for voltage to the compressor: none. Aux fan does not run. I have checked the continuity across the clutch to ground: OK. My A/C pressure switch (new) shows 5 volts on the reference voltage, ground is good, signal wire shows 1.3 volts. Any Suggestions?
 

·
Registered
Joined
·
214 Posts
120 equilibrium sounds about right.

AC won't run If the aux fan isn't working.

Make sure the fan turns a bit when you first start the car (it's a test it does to confirm the fan is there)
 

·
Nuclear engineer
02/2012 X5 35d M57Y CPO 98K miles NOKIAN WR G3 12K miles
Joined
·
16,386 Posts
" ready state.The IHKA transmits a speed increase request to the ECM.
Depending on the temperature and the nominal-value setting, the IHKA sends a cooling
power request to the ECM If theECM is ready and in a position to provide
a torque of > 20 Nm, the ECM issues a release for a load connection of up to 30
Nm. This release is also monitored by the junction box. The IHKA issues a command to
the junction box to couple the connection. The junction box returns the coupling status to
the ECM."
 
1 - 3 of 3 Posts
Top