Cooling fans on full power
#1
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Question regarding cooling fans on my 996 4S from 2003.
When starting the car, the fans is, obviously, quiet and on low power but as soon as
I start the air conditioning unit, they immediately gets into full power and stays that way during my ride.
Is this correct?
I mean, should the cooling fans go at full speed the whole time while the air con is activated or
is it something wrong with my car?
When starting the car, the fans is, obviously, quiet and on low power but as soon as
I start the air conditioning unit, they immediately gets into full power and stays that way during my ride.
Is this correct?
I mean, should the cooling fans go at full speed the whole time while the air con is activated or
is it something wrong with my car?
#2
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
No, the fans should operate at high speed if the AC fluid pressure is >16bar. So something in the AC circuit (the pressure sensor) might be giving a false reading, or else the reading is correct and something is causing high pressure like that.
Does your AC otherwise work normally (get cold)?
Does your AC otherwise work normally (get cold)?
#3
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
No, the fans should operate at high speed if the AC fluid pressure is >16bar. So something in the AC circuit (the pressure sensor) might be giving a false reading, or else the reading is correct and something is causing high pressure like that.
Does your AC otherwise work normally (get cold)?
Does your AC otherwise work normally (get cold)?
#4
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Did you recently acquire your car?
Maybe the previous owner jumped the low- and high-speed fan relays. That’s what I did to mine, and my fans run at high speed when my AC is activated.
Maybe the previous owner jumped the low- and high-speed fan relays. That’s what I did to mine, and my fans run at high speed when my AC is activated.
The following 2 users liked this post by 996love:
hardtailer (07-27-2024)
#5
Drifting
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Are you sure your engine cooling fans are on low speed when you start the car, because they shouldn't be? Next time you start the car, get out go to the front wheel well and put your hand between the front tire and the front of the fender liner(C4S have the outlet louvers in the fender liner). Do you feel significant air movement? You shouldn't as fans should NOT be running at this time. The cooling fans are fairly loud and should run on low speed when you turn the air conditioner on not when you start the car, unless as mentioned above, a modification has been done.
#6
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Are you sure your engine cooling fans are on low speed when you start the car, because they shouldn't be? Next time you start the car, get out go to the front wheel well and put your hand between the front tire and the front of the fender liner(C4S have the outlet louvers in the fender liner). Do you feel significant air movement? You shouldn't as fans should NOT be running at this time. The cooling fans are fairly loud and should run on low speed when you turn the air conditioner on not when you start the car, unless as mentioned above, a modification has been done.
cooling fans are off or in low speed and as soon
as I start the air con they immediately turns to full speed
#7
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Question regarding cooling fans on my 996 4S from 2003.
When starting the car, the fans is, obviously, quiet and on low power but as soon as
I start the air conditioning unit, they immediately gets into full power and stays that way during my ride.
Is this correct?
I mean, should the cooling fans go at full speed the whole time while the air con is activated or
is it something wrong with my car?
When starting the car, the fans is, obviously, quiet and on low power but as soon as
I start the air conditioning unit, they immediately gets into full power and stays that way during my ride.
Is this correct?
I mean, should the cooling fans go at full speed the whole time while the air con is activated or
is it something wrong with my car?
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Doug
The following users liked this post:
996love (07-31-2024)