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Old 29-07-2021, 08:37 PM   #471
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Nice result!!

I agree completely with Henry, I've previously done a week with, then a week without Air-con, brimming each tank then checking consumption at the pump. Having air con makes no noticeable difference.

But it keeps your interior dry and therefore reduces condensation in the winter. Completely worth leaving on.

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Old 29-07-2021, 09:21 PM   #472
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Quote:
Originally Posted by Henry_b View Post
Good result with the Air'con.

Its best to keep it on, the old wives tail of the compressor ruining fuel consumption etc etc was true in the 70s and 80s on big cars, with massive old Frigidaire compressors but now the draw from a compressor is unlikely to inhibit fuel conssumption by any great measure.

The Good thing about the E39 is it has a DCCV which effectively stops any/all hot coolant going to the heater core which makes the A/C on BMW's somewhat legendary.
Thanks Henry, yep you're spot on. I'm going to buy a thermometer to test how legendary it really is.

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Originally Posted by c16rkc View Post
Nice result!!

I agree completely with Henry, I've previously done a week with, then a week without Air-con, brimming each tank then checking consumption at the pump. Having air con makes no noticeable difference.

But it keeps your interior dry and therefore reduces condensation in the winter. Completely worth leaving on.

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Thank you

I've always had this argument with virtually everyone and sometimes even car people.

In a previous life when I was driving nearly new cars etc that had AC, it was left on permanently and as I said will carry on and do so with this.

It's funny I told a friend what I'd had done and how I'd be leaving it on and he said he never kept his on due to mpg.

I always say, air conditioning is in the name, it conditions the air and it just happens the most useful side effect is it produces lovely cold air.
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Old 29-07-2021, 09:40 PM   #473
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Good result there. It’s such a mistaken belief that Air Con is only for cold days too - it’s does all temperatures and, for the benefit of the system, the seals and other components, I use it always to set whatever temperature I want.


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Old 02-08-2021, 01:00 PM   #474
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Now that the A/C is working this has presented/shown up what I assume was an existing problem.

The aux fan does not come on. With the A/C on the condenser needs to be kept cool as does the engine coolant as it all runs hot when the A/C is running.

Sat in traffic with the A/C on and all of a sudden this horrible vibration was shooting through the car, with the A/C turned off, it stopped. I quickly checked the coolant temp on the OBD and it was a bit too high for my liking.

With the A/C off the viscous fan obviously does a good enough job in traffic to keep everything within parameters but not so much with the A/C on.

So it actually presents as 2 faults...It doesn't come on with the A/C and it doesn't come on when the coolant temp gets to a certain temperature.

So far:

Checked the fuses, awful place, have to remove bottom of dash behind the glovebox as they are huge and not in the normal fuse panel.

Done a fault code read (with ISTA D - BMWs Software) nothing in there to do with the A/C or Aux or HVAC system.

I have used a multimeter and there is 12V/14V getting to the connector and with the A/C switched on the PWM wire registers some voltage on and off which apparently is right (you need an oscilloscope to see what the range is) but this voltage check at least lets me see it's sending 'something'.

The fan with the A/C on, twists for a split second then rocks backwards, does this every 10 or so seconds but doesn't actually keep spinning.

I only got a short amount of time to Diag yesterday so, I need to use ISTA to try and force the fan on, if the fan physically spins we know the issue maybe with PWM wire or the control module on the fan.



For info. Earlier E39s had a resistor style fan, which had 3 speed modes, you could replace resistors and the motor. The later PWM style fan that I have, is a total replacement piece which is not cheap.
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Old 02-08-2021, 04:56 PM   #475
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Yep, been there, The M5’s can’t keep their cool in traffic.
I replaced mine with a used fan from eBay and it been okay for about four years now.


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Old 02-08-2021, 07:39 PM   #476
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How easy is it to spin the Viscous fan when she's hot?

And cold for that matter,

Sounds like the Viscous coupling unit is dead.

As for the AUX fan it sounds like it's junk, a replacement is in order!!

The Aux Fan on my P38 is dead, and does the exact same as yours, except I have 2 of the bloody things plus a 17" Viscous fan!
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Old 03-08-2021, 09:24 AM   #477
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I had the same issue on my E39 with the PWM fan, if I recall I got one from continental car components (C3 BMW) and it was around £200. That was 10 years ago though, so no idea of the current cost or if they are still going.

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Old 03-08-2021, 01:34 PM   #478
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What a pain, and such an obscure thing to need to find.

I hope it ends up being something simple, but it's not sounding good...
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Old 03-08-2021, 05:09 PM   #479
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Thank you for the responses guys

I believe the viscous fan is working correctly, it keeps the coolant/engine cool no matter the weather (as long as the A/C isn't on for a prolonged period in the heat without a working aux fan )

Had more time to spend last night diagnosing.

Connected ISTA D to the car and read the fault codes, I had cleared the myriad of ones that came up when I looked at the weekend and a few persisted and...a new one appeared!

Remember there wasn't a fault code stored for the fan....now there is!

Notice fault code 00007D - DME: Activation, electric fan.



In order, the faults are:
Oxygen/Lambda Sensor - This has been there for a while. I need a new one.
Fan Fault - What this little escapade is all about
AUC Sensor - Air Quality Sensor for Auto Recirculation
PDC - Parking Sensor
Seat Occupancy - Common fault, got a resistor pack for that ready to fit

I'm unsure as to why considering the A/C has been in use since Thursday, why only now has the fault code appeared, maybe it has to present an issue multiple times before it shows.

Here is the tree of modules on this BMW, like we say, it's a classic but was and still is extremely modern where the vital electronics are concerned.



DME is Digital Motor Electronics and is the ECU that controls all the engines functions.

When clicking on the fault for the Fan, I was presented with this:



I think the list at the top shows what the fault 'could' be.

So I called up the functions of the DME ECU and could trigger the Aux Fan:

(I've messed this screenshot right up, I'll get another when I next hook it up, literally the button that is missing off this screenshot is the one that says trigger fan)



When activated...the fan did this...




I need a new fan.
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Old 03-08-2021, 08:04 PM   #480
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Does look like a fan issue, but just to be certain, you don't have any chaffed wiring near the fan at all?, as the fault list shows a short to earth.

Worth a quick check, and may end up being a lot cheaper.
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