1995 BMW 740 INTERMITTENT A/C

  • Tiny
  • Grady_TX
  • 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

Thursday, June 24th, 2010 AT 8:32 PM

6 Answers

  • Tiny
  • Dr. Hagerty
  • Expert
  • 9,705 posts

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

Was this
answer
helpful?
Yes
No
Friday, June 25th, 2010 AT 12:10 AM
  • Tiny
  • Grady_TX
  • Member

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

Was this
answer
helpful?
Yes
No
Friday, June 25th, 2010 AT 8:30 AM
  • Tiny
  • Grady_TX
  • Member

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

Was this
answer
helpful?
Yes
No
Friday, June 25th, 2010 AT 9:04 AM
  • Tiny
  • Dr. Hagerty
  • Expert
  • 9,705 posts

Did the problem get taken care of Grady?

Was this
answer
helpful?
Yes
No
Wednesday, July 7th, 2010 AT 11:31 PM
  • Tiny
  • Grady_TX
  • Member

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

Was this
answer
helpful?
Yes
No
Wednesday, July 14th, 2010 AT 8:07 PM
  • Tiny
  • Dr. Hagerty
  • Expert
  • 9,705 posts

Kool baby

Was this
answer
helpful?
Yes
No
Thursday, July 15th, 2010 AT 9:25 AM

Please login or register to post a reply.

Similar Questions