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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 09-30-2013, 06:55 AM
alsy alsy is offline
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Fan Delete Mod

It seems everyone is sick of hearing about this mod, buuuut i have a question that i think is probably going to be a stupid one but i cant find the answer to it.

Why do you need a lower temp fan switch when you are removing the fan?

Thanks
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  #2  
Old 09-30-2013, 07:35 AM
hnaz hnaz is offline
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Quote:
Originally Posted by alsy View Post
It seems everyone is sick of hearing about this mod, buuuut i have a question that i think is probably going to be a stupid one but i cant find the answer to it.

Why do you need a lower temp fan switch when you are removing the fan?

Thanks
It's s safety, just in case.
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  #3  
Old 09-30-2013, 07:41 AM
alsy alsy is offline
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Just incase what though? it wont be turning anything on? surely just blocking the hole on the side of the radiator is literally no different...?
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  #4  
Old 09-30-2013, 08:31 AM
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You read the threads regarding the FDM.. and you didnt find your answer??
I doubt it..

BECAUSE WITHOUT THE FAN, THE CAR RUNS HOTTER.

If you have UNDERDRIVE PULLEYS YOU NEED THE LOWER THERMOSTAT.
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  #5  
Old 09-30-2013, 08:46 AM
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Quote:
Originally Posted by hnaz View Post
It's s safety, just in case.


Quote:
Originally Posted by alsy View Post
Just incase what though?
it wont be turning anything on?
surely just blocking the hole on the side of the radiator is literally no different...?

Are you fcuknig kidding me?

THERMOSTAT - is a THERMAL SWITCH activated at a specific TEMPERATURE.
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Last edited by bmw-mania; 09-30-2013 at 08:49 AM.
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  #6  
Old 09-30-2013, 09:05 AM
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Re: Fan Delete Mod

Quote:
Originally Posted by bmw-mania View Post
You read the threads regarding the FDM.. and you didnt find your answer??
I doubt it..

BECAUSE WITHOUT THE FAN, THE CAR RUNS HOTTER.

If you have UNDERDRIVE PULLEYS YOU NEED THE LOWER THERMOSTAT.

Quote:
Originally Posted by bmw-mania View Post




Are you fcuknig kidding me?

THERMOSTAT - is a THERMAL SWITCH activated at a specific TEMPERATURE.
Dude. What the f*ck are you talking about? The question has nothing to do with the thermostat.



OP, the Fan Delete Mod removes the viscous fan between the radiator and the engine. That fan is completely mechanical, no electrical at all. What the temperature switch that you're referring to does is turn on the electric pusher fan in FRONT of the radiator.

Normally, the electric fan only comes on when the air conditioning is running, or when the car is getting very hot. The mechanical fan provides almost all of the actual cooling of the engine. Since the electric fan is designed to come on only when very hot, this means that your engine will not get be getting any additional air at all at high temperatures until you reach the very high threshold for the electric fan and could leave you very vulnerable to overheating. The lower switch makes the electric fan come on earlier, to take part of the job the the mechanical fan was doing before you removed it and provide more protection against overheating.

That said, there's absolutely nothing wrong at all with the viscous fan setup,
removing it is a bad idea.

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  #7  
Old 09-30-2013, 09:23 AM
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Originally Posted by E36 Phantom View Post
Dude. What the f*ck are you talking about? The question has nothing to do with the thermostat.
You're right.. I re-read it.. I swear I read thermostat.

Mustve been the superblue brake fluid in my eye..

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  #8  
Old 09-30-2013, 09:24 AM
alsy alsy is offline
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How funny is the internet with people shouting their heads off when they are still completely wrong, i asked the question and knew your answers were bull****.... as for phantom, thank you... that makes sense. And as i've removed the air con, i will not be needing the lower temp switch, correct?
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  #9  
Old 09-30-2013, 09:42 AM
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Re: Fan Delete Mod

Quote:
Originally Posted by alsy View Post
How funny is the internet with people shouting their heads off when they are still completely wrong, i asked the question and knew your answers were bull****.... as for phantom, thank you... that makes sense. And as i've removed the air con, i will not be needing the lower temp switch, correct?
That's incorrect. You NEED air moving over the radiator or you'll over heat. When you do the FDM you still need the air flow, but now you're relying on the electric fan to provide it. Like I said, the electric fan only comes on A) When A/C is on OR B) when you exceed very high temperature limit of the fan switch on the radiator. A&B are separate situations, the elec fan will still come on without A/C when the temp for the switch is met.

The idea is that temp is set very high because it's only supposed to help the mechanical fan in very hot situations with mechanical fan can't keep up. When you remove the mechanical fan, then you're not getting any air until extremely high temperatures. So, you change the temp switch so it comes on earlier before you're at dangerous temps.

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  #10  
Old 09-30-2013, 09:52 AM
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Originally Posted by alsy View Post
How funny is the internet with people shouting their heads off when they are still completely wrong, i asked the question and knew your answers were bull****....
^ feeling high and mighty now??
What shouting? You mean EMPHASIS? We're on the interweb.

Its called a AUX fan.. short for auxiliary fan, dipswitch.
Your post simply stated "lower temp fan switch".. which, stupid fcknig me, I took for "lower temp thermostat"
Because.. there is no "lower temp switch" on the fixed fan.

I assumed since you didnt SPECIFY what you were talking about, you must've meant the THERMOSTAT.
Since the THERMOSTAT is changed to a "lower temp" when you do the FDM and is available in multiple different "lower temp"s. 88, 92, 74, etc..

Your question was answered in the FDM thread... on this forum, bimmerfourms, m3net, r3vlimited, etc..

Quote:
Originally Posted by alsy View Post
And as i've removed the air con, i will not be needing the lower temp switch, correct?
NO.
YOU NEED TO DRAW AIR OVER THE RADIATOR TO COOL THE COOLANT.

Are you aware of how the systems on a vehicle work?
Please re-read the FDM threads..

Sorry about your luck.
Cheers!
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  #11  
Old 09-30-2013, 09:52 AM
alsy alsy is offline
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Originally Posted by E36 Phantom View Post
That's incorrect. You NEED air moving over the radiator or you'll over heat. When you do the FDM you still need the air flow, but now you're relying on the electric fan to provide it. Like I said, the electric fan only comes on A) When A/C is on OR B) when you exceed very high temperature limit of the fan switch on the radiator. A&B are separate situations, the elec fan will still come on without A/C when the temp for the switch is met.

The idea is that temp is set very high because it's only supposed to help the mechanical fan in very hot situations with mechanical fan can't keep up. When you remove the mechanical fan, then you're not getting any air until extremely high temperatures. So, you change the temp switch so it comes on earlier before you're at dangerous temps.

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sorry i don't think i explained what i meant clearly, i've removed the air con along with the fan that sits on the front of the rad, which is normally the air con fan right? if so i am right in saying i don't need that switch?

sorry if im not making much sense.
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  #12  
Old 09-30-2013, 09:54 AM
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Quick draw!

Damn.. you're fast phantom..
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  #13  
Old 09-30-2013, 09:57 AM
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The electric fan serves two purposes: To add cooling air flow when the AC is on, AND to add cooling air when the coolant temperature gets higher than normal. In fact, it has two speeds, and will 'kick it up a notch' if the temperature gets really high.

Cliffs: You need that electric fan. Put it back.
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  #14  
Old 09-30-2013, 09:57 AM
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Quote:
Originally Posted by alsy View Post
sorry i don't think i explained what i meant clearly, i've removed the air con along with the fan that sits on the front of the rad, which is normally the air con fan right? if so i am right in saying i don't need that switch?

sorry if im not making much sense.
You're saying you removed the aux fan, the only fan you have left...?
Reinstall and hardwire to a switch.
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  #15  
Old 09-30-2013, 10:00 AM
alsy alsy is offline
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No i have a fan hardwired to a switch, just not the aux fan. that's why i'm wondering about the switch, because in my head its now doing nothing except stopping water falling out the hole right?
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  #16  
Old 09-30-2013, 10:06 AM
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you should have put ^ this info in your original post.

If you have a fan wired to a switch for the radiator..
then you can re-install the A/C AUX fan sending unit without connecting it to "plug" the hole.
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  #17  
Old 09-30-2013, 10:08 AM
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awesome, you actually ended up being helpful.. thank you. no hard feelings, haha.
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Old 09-30-2013, 10:08 AM
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Re: Fan Delete Mod

Let's go back to square one so we're all on the same page.

There are two fans. Electric on the front, viscous on the back.

FDM usually refers to removing the viscous and keeping the electric.

You're saying you removed both fans though and replaced one with an electric on a switch, is this correct?
I'm assuming the new fan you're talking about is a puller fan between the radiator and engine?
Where is the switch for this getting its temp data from?

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  #19  
Old 09-30-2013, 10:20 AM
alsy alsy is offline
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Yep, all correct.. and shoot me down but it isn't, i just turn it on when i feel i need it, will most likely be on all the time bar the first 10 - 15 minutes of having the car run... but i live in england, its rarely hot i don't really have to worry about stupid high temps.
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Old 09-30-2013, 10:23 AM
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Quote:
Originally Posted by alsy View Post
awesome, you actually ended up being helpful.. thank you. no hard feelings, haha.
None.
You actually ended up learning..


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Originally Posted by E36 Phantom View Post
Where is the switch for this getting its temp data from?
His finger.

Quote:
Originally Posted by alsy View Post
Yep, all correct..
and shoot me down but it isn't, i just turn it on when i feel i need it,
will most likely be on all the time bar the first 10 - 15 minutes of having the car run...
but i live in england, its rarely hot i don't really have to worry about stupid high temps.
what? no shooting. We're indoors.

You dont need to turn the fan on during initial startup.. just during operation when at temperature.
turn it on if you're in traffic for longer than 2 minutes, or sitting and idling..

Cheers!
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Last edited by bmw-mania; 09-30-2013 at 10:27 AM.
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  #21  
Old 09-30-2013, 10:37 AM
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mania, I got notice you'd PMed me, but I can't reply until you clear out your inbox. You are over the limit for message storage.
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  #22  
Old 09-30-2013, 10:45 AM
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Re: Fan Delete Mod

Quote:
Originally Posted by alsy View Post
Yep, all correct.. and shoot me down but it isn't, i just turn it on when i feel i need it, will most likely be on all the time bar the first 10 - 15 minutes of having the car run... but i live in england, its rarely hot i don't really have to worry about stupid high temps.
Ultimately you have to make the decision based on the risk you're comfortable with, but I can't imagine doing it that way.

Why not replace the aux fan switch with a lower temp unit and splice the wires to your new fan? Then you wouldn't have to deal with the manual switch.

To bring it full circle, if you're dead set on keeping it the way you have it (which I think most all of us would highly advise against), you're right that the switch in the radiator is now just plugging the hole and wouldn't need to be changed out.

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  #23  
Old 09-30-2013, 10:58 AM
alsy alsy is offline
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mainly because my ability to wire stuff is awful, this way its simple and i'm in control.
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