Mechanics

INTERMITTENT A/C

1995 BMW 740

Air Conditioning problem
1995 BMW 740 V8 Two Wheel Drive Automatic 118000 miles

The subject is not quite accurate. The A/C works fine. What is intermittent is the blower.
It makes no bad noises, it always works in the morning or after a good rest; it just sometimes doesn't work on a re-start.
Mostly it will not work until the car sits for an hour or two. Occasionally it comes on after a 10-15 minutes of driving.
Turning the a/c switch and other controls on-off has no effect.
When off, a small amount of cold air still seeps through. The compressor clutch cycles on and off about every 30 seconds.
Yet I think it's a s sensor or switch rather than the entire blower (fingers crossed). Grady
Avatar
Grady_TX
June 24, 2010.




The final stage unit sits on top of the fan, and it is suspect.

Dr. Hagerty
Jun 25, 2010.
My book doesn't show a " final stage". It does refer to a power unit (which iItake to be the blower motor) are they the same or am I missing something?

Either way I assume access it via removing the air bag, dash, etc. Not sure I have the courage for that! What is the shop time to make the change?

Thanks Grady
AD

Tiny
Grady_TX
Jun 25, 2010.
Nothing in the Bentley Book but lots of info on the internet. Appears to be a small electronic unit in the pass. Foot-well and a easy change out.

I'll give a try thanks! Grady

Tiny
Grady_TX
Jun 25, 2010.
Did the problem get taken care of Grady?

Dr. Hagerty
Jul 7, 2010.
Not really - Turns out the easy-to-change version is only for 3 & 5 series, on a '95 7 series it's buried in the blower motor so it's a full-dash apart job to replace it.

The good news is that with a can of refrigerant, the a/c is cold enough to keep the module from overheating (I'm guessing).

Knock on wood, it has been working.

Thanks for checking. Grady

Tiny
Grady_TX
Jul 14, 2010.
Kool baby

Dr. Hagerty
Jul 15, 2010.

AD