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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Mon, Oct-30-2017, 06:03:40 PM   #11
LockDots
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Default Re: Not your typical A/C (HVAC) question.

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Originally Posted by M_Parallel View Post
That does surprise me as neither your temp nor pressure switch is activated without the AC relay.
The button on the climate control is just that, a button to activate the AC relay->comperssor.

I mean, I doubt your engine's coolant temp was triggering the aux switch.
You could unplug it to remove it from the equation.

Could US cars be wired differently?
I may try that and meter it just to see if it's shared with and getting a ground from the ECU with the AC relay.

Engine temp wasn't an issue, this was done within seconds of having the engine on and having it sit in the garage for a few days before hand.

I doubt they're wired differently. I've only seen Canadian models wired differently, and even then it's usually Lights-related (i.e. DRL).

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You know what, since it's easy to check, I'll pull the relay from my car and will turn on the AC and see what happens.

If my fan kicks in, I'll dive into the ETM again. I only recall there being the 2 triggers I mentioned in my other post.

I've only once in 11 years had my aux fan kick in without the AC on and that was when it was idling for a long time in hot weather.
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You are over thinking it. Unless something is wrong, you aren't going to have over heating issues during an autocross run, especially not in fall weather. On a longer track sure, but a 30-60sec autocross run isn't going to cause any problems. I would just go enjoy the event, then do whatever switch when you have time.
I definitely am and I doubt I'll need the extra cooling. I figured it couldn't hurt, but most importantly I'm just curious about it now. Could be an easy way to have a "manual override" for the track guys without having to run a wire into the cabin for a switch.
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Old Mon, Oct-30-2017, 06:40:39 PM   #12
M_Parallel
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Default Re: Not your typical A/C (HVAC) question.

Years ago for some Nordschleife laps, I laid wire from the dual temp sensor to the interior so I could turn on the fan from inside. You can take either side of the pin for stage 1 or stage 2.

Off to my car now...

Did check the ETM again. There is a direct link from DME to the fan, but it doesn't state what the triggers the DME. Could be the same pressure/temp switch signals.
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Old Mon, Oct-30-2017, 06:53:49 PM   #13
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Default Re: Not your typical A/C (HVAC) question.

Ok just tested this. Whatdoyouknow, the fan kicks in immediately. Do double check I pulled both the relay and the connector to the compressor.

So this must be some safety function. Learned something new today.
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Old Mon, Oct-30-2017, 07:19:20 PM   #14
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Default Re: Not your typical A/C (HVAC) question.

TheMoreYouKnow.gif

:rofl:

I'm going to test it for a longer time tonight up to and a little past the time it takes to get to normal operating temperature to see if it cycles like it normally would with the AC compressor or if it stays on as a fail-safe.
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Old Mon, Oct-30-2017, 07:26:13 PM   #15
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Default Re: Not your typical A/C (HVAC) question.

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TheMoreYouKnow.gif

:rofl:

I'm going to test it for a longer time tonight up to and a little past the time it takes to get to normal operating temperature to see if it cycles like it normally would with the AC compressor or if it stays on as a fail-safe.
It works normally just fine. You can leave the relay in and pull the belt if you are worried about anything electrical related.
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Old Mon, Oct-30-2017, 07:33:36 PM   #16
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Default Re: Not your typical A/C (HVAC) question.

I think he’s more worried about the fan running continuously.
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Old Mon, Oct-30-2017, 07:42:48 PM   #17
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Default Re: Not your typical A/C (HVAC) question.

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I think he’s more worried about the fan running continuously.
It works NORMALLY with the a/c switch off. It doesn’t matter if it is on all the time. Summer here we all have them on constantly.
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Old Mon, Oct-30-2017, 07:53:22 PM   #18
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Default Re: Not your typical A/C (HVAC) question.

Well, I'm not looking for it to operate "normally". Ultimately I'd like it to be on constantly so long as the AC is turned on but the relay is out.
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Old Mon, Oct-30-2017, 07:56:36 PM   #19
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Default Re: Not your typical A/C (HVAC) question.

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Well, I'm not looking for it to operate "normally". Ultimately I'd like it to be on constantly so long as the AC is turned on but the relay is out.
Button OFF = normal operation
Button ON = fan on

It’s that easy and as described in post 2
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Old Mon, Oct-30-2017, 08:00:12 PM   #20
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Default Re: Not your typical A/C (HVAC) question.

Off yes. The question was what happens with it on. Which I know now.

But Lock, what are you trying to achieve? Delete the ac but still have the aux fan function?

Funny though, in hindsight, I didn’t need to have run that wire and adding the interior switch. It was there all the time. I just needed to pull the A/C relay if I didn’t want to run the A/C to have the fan running.
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Discussing Not your typical A/C (HVAC) question. in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)