Cooling Fans
Thread Starter
Instructor
Joined: Dec 2005
Posts: 101
Likes: 0
Cooling Fans
Seems like a simple question...but for some reason...i feel like I'm losing my mind....
When you turn on your car.....does the #1 fan come on automatically....or when it only hits a certain degree?
Then......the second one comes on upon reaching a higher temp (226?) or when you turn on the a/c.
Is this correct? I can't remember if my #1 fan came on instantly when I turned on the car...or only after it warmed up.
When you turn on your car.....does the #1 fan come on automatically....or when it only hits a certain degree?
Then......the second one comes on upon reaching a higher temp (226?) or when you turn on the a/c.
Is this correct? I can't remember if my #1 fan came on instantly when I turned on the car...or only after it warmed up.
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
I think what you may be noticing is the electric air pump, I thought it was the fan running on my car too when it is cold. Open the hood and take a look, I think you will see both fans are off on start up.
Thread Starter
Instructor
Joined: Dec 2005
Posts: 101
Likes: 0
I just assumed (or thought) it came on upon start up.
Thats why I was wondering if it came on immediatly...or after a little bit.
Race Director
Joined: Oct 2005
Posts: 11,771
Likes: 177
From: Rolla Missouri
2021 C4 of the Year - Unmodified Finalist
St. Jude Donor '10 thru '25
Some people may think it's not on, but if you have the electronic climate control it very well could command a/c as soon as you start the car (depending on what you have the settings at, and air temp.)
The cooling fans are not just controlled by the ignition key and sending power to them. They will not run unless certain parameters are met. There are times when you don't want them running (speed over approx. 35mph for example). At speed they will hinder airflow more than help it.
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
When you first stat the car, neither fan should be running (UNLESS you have the a/c system on).
Some people may think it's not on, but if you have the electronic climate control it very well could command a/c as soon as you start the car (depending on what you have the settings at, and air temp.)
The cooling fans are not just controlled by the ignition key and sending power to them. They will not run unless certain parameters are met. There are times when you don't want them running (speed over approx. 35mph for example). At speed they will hinder airflow more than help it.
Some people may think it's not on, but if you have the electronic climate control it very well could command a/c as soon as you start the car (depending on what you have the settings at, and air temp.)
The cooling fans are not just controlled by the ignition key and sending power to them. They will not run unless certain parameters are met. There are times when you don't want them running (speed over approx. 35mph for example). At speed they will hinder airflow more than help it.
If the climate control is on as stated the fan could run even when cold.
Thread Starter
Instructor
Joined: Dec 2005
Posts: 101
Likes: 0
When you first stat the car, neither fan should be running (UNLESS you have the a/c system on).
Some people may think it's not on, but if you have the electronic climate control it very well could command a/c as soon as you start the car (depending on what you have the settings at, and air temp.)
The cooling fans are not just controlled by the ignition key and sending power to them. They will not run unless certain parameters are met. There are times when you don't want them running (speed over approx. 35mph for example). At speed they will hinder airflow more than help it.
Some people may think it's not on, but if you have the electronic climate control it very well could command a/c as soon as you start the car (depending on what you have the settings at, and air temp.)
The cooling fans are not just controlled by the ignition key and sending power to them. They will not run unless certain parameters are met. There are times when you don't want them running (speed over approx. 35mph for example). At speed they will hinder airflow more than help it.
Thanks
I wasn't sure...but your explanation helps.
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Intermediate
Joined: Aug 2007
Posts: 40
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From: Raleigh NC
The 91 service manual explains it as:
*) if A/C is requested (this can happen in auto mode), the main fan (top fan) will turn on, but no aux fan.
*) if temp gets to 108C (226F) the main fan will turn on.
*) if temp gets to 113C (235F?) the main and aux fan will turn on.
*) if temp goes back to 108C the aux will turn off.
*) if A/C is requested (this can happen in auto mode), the main fan (top fan) will turn on, but no aux fan.
*) if temp gets to 108C (226F) the main fan will turn on.
*) if temp gets to 113C (235F?) the main and aux fan will turn on.
*) if temp goes back to 108C the aux will turn off.