aux fan running when i turn on ignition

[daveking]

Hi
when i turn my ignition on the aux fan runs at high speed.
The AC compressor does not engage.

I never had a working fan since i owned the x5.
Got one from a working x5 with AC working great.
The engine temp is ok as it is just under normal.
Is there any way to test for the problem.

I have impa and pa soft.
I can remember checking codes for air suspension and seeing
a hvac error.

Thank you

Dave king

[Fifty150hs]

Originally Posted by daveking

Hi
when i turn my ignition on the aux fan runs at high speed.
The AC compressor does not engage.

I never had a working fan since i owned the x5.
Got one from a working x5 with AC working great.
The engine temp is ok as it is just under normal.
Is there any way to test for the problem.

I have impa and pa soft.
I can remember checking codes for air suspension and seeing
a hvac error.

Thank you

Dave king

If you're overfilled with freon your fan will do that. What's your low side pressure?

[upallnight]

Originally Posted by Fifty150hs

If you're overfilled with freon your fan will do that. What's your low side pressure?

Kind of hard to get a "Low side Pressure" when the compressor is not engaging.

What are the static pressure of the low side and high side gauges.

[80stech]

The aux fan will kick in to high with either the high side A/C pressure switch or lower rad hose temp switch open or not connected.

[daveking]

Hi
picked up a top up kit today.

only low side gauge, but it was off the scale round past the red.

[upallnight]

Originally Posted by daveking

Hi
picked up a top up kit today.

only low side gauge, but it was off the scale round past the red.

That's the static reading with a compressor that is not running. If it was a true gauge instead of just a color gauge such as yellow, green and red you can tell the actual pressure. The compressor needs to be running in order to determine if the system is under/overcharge.