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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, 08:05:30 PM   #21
Braymond141
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Default Re: Not your typical A/C (HVAC) question.

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Originally Posted by M_Parallel View Post
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.
He already stated what he’s trying to achieve and your last paragraph answers why anyone would want this... is this repeat shit to death day?
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Old Mon, Oct-30-2017, 08:09:38 PM   #22
LockDots
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Default Re: Not your typical A/C (HVAC) question.

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Originally Posted by Braymond141 View Post
Button OFF = normal operation
Button ON = fan on

It’s that easy and as described in post 2
Ah, yes. I misread.


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Originally Posted by M_Parallel View Post
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.
I wanted a makeshift manual override for my fans. I wanted to be able to have both my electric puller (replaced the clutch driven fan) and aux fan on at the same time, and constantly for as long as I want. We know this is possible now by just removing the relay instead of adding wiring to the fan switch/aux fan relays.

Not looking to delete or remove the AC. Hence, why I was looking into just pulling the relay. This keeps my fans on and doesn't kick on the compressor so there's no added load on the engine.

Once I'm done with my event, I can put the relay back in and I'm back to normal.
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Old Mon, Oct-30-2017, 08:51:10 PM   #23
M_Parallel
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Default Re: Not your typical A/C (HVAC) question.

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Originally Posted by Braymond141 View Post
He already stated what he’s trying to achieve and your last paragraph answers why anyone would want this... is this repeat shit to death day?
Call it what you want.
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Old Wed, Nov-01-2017, 12:56:27 AM   #24
francemyrie
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Default Re: Not your typical A/C (HVAC) question.

The reason the fans come on with the relay for compressor removed may be by design.

The PCM controls the fan based on temperature of the engine coolant or pressure in the AC plumbing.

But there is also a Fail-Safe mode at play here.

Another example: The fans will run if the temperature sensor is disconnected.

If the PCM does not know the engine temperature.... guess what....fans go on. Better safe than sorry.

Hope this helps

Sent from my Pixel XL using Tapatalk

Last edited by francemyrie; Wed, Nov-01-2017 at 04:05:52 AM.
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Old Wed, Nov-01-2017, 02:05:05 PM   #25
LockDots
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Default Re: Not your typical A/C (HVAC) question.

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Originally Posted by francemyrie View Post
The reason the fans come on with the relay for compressor removed may be by design.

The PCM controls the fan based on temperature of the engine coolant or pressure in the AC plumbing.

But there is also a Fail-Safe mode at play here.

Another example: The fans will run if the temperature sensor is disconnected.

If the PCM does not know the engine temperature.... guess what....fans go on. Better safe than sorry.

Hope this helps

Sent from my Pixel XL using Tapatalk
Interesting, and good to know. Thanks!
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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)