Revs drop when fan kicks in..

Neily03 · 07-09-2006, 08:20

When stationary with the engine just ticking over and the radiator fan kicks in the rev's drop by about 100rpm with a small shudder, just for a split second. Is this normal for the vRS?

In my last car you couldn't tell when the fan came on....

Goochie · 07-09-2006, 08:21

It's putting load on the alternator and hence, the engine. Perfectly normal.

Neily03 · 07-09-2006, 08:24

Quote:

Originally Posted by Goochie

It's putting load on the alternator and hence, the engine. Perfectly normal.

Thought so, i knew that it'd be down the the extra load on the alternator, its just that in my CTR when the fan came on nothing happened (no drop in rev's, dimming lights or anything).... maybe that didn't put as much load on it...

TeflonTom · 07-09-2006, 08:41

i would have said that it wouln't make much difference when the fan comes on! i would check the battery/alternator to check it is charging properly

Neily03 · 07-09-2006, 08:46

Quote:

Originally Posted by TeflonTom

i would have said that it wouln't make much difference when the fan comes on! i would check the battery/alternator to check it is charging properly

It bloody better be! The car is only 6 days old with 340miles on it!

**mannyo** · 07-09-2006, 09:10

Try running with the Aircon on, that should switch the fans on permanently.

Neily03 · 07-09-2006, 09:19

Quote:

Originally Posted by mannyo

Try running with the Aircon on, that should switch the fans on permanently.

I never switch the AC off!

That won't make the fan for the coolant stay on though.... that'd be daft.

Its probably fine, think i'm just a little paranoid cos its new.....

TeflonTom · 07-09-2006, 09:27

Quote:

Originally Posted by Neily03

That won't make the fan for the coolant stay on though.... that'd be daft.

.....

all the time the aircon is on the fan runs too!

Neily03 · 07-09-2006, 09:28

Quote:

Originally Posted by TeflonTom

all the time the aircon is on the fan runs too!

Even the fan for the coolant???

That doesn't make any sense?? I thought it'd just be the can for the AC....

TeflonTom · 07-09-2006, 09:29

Quote:

Originally Posted by Neily03

Even the fan for the coolant???

go outside and try it!!

Neily03 · 07-09-2006, 09:30

Quote:

Originally Posted by TeflonTom

go outside and try it!!

I will, later.....

**robmawer** · 07-09-2006, 09:33

Quote:

Originally Posted by Neily03

Even the fan for the coolant???

That doesn't make any sense?? I thought it'd just be the can for the AC....

I would've thought so too - on mine, there are two fans, one which runs with the air-conditioning, and one which runs for the coolant when the engine temperature rises.

Fun afternoon that was, I can tell you...

Rob.

bengie · 07-09-2006, 09:36

the rad for the aircon is infront of the engine rad so how can they have different fans

and don;'t worry about it every car i've had has done this

press two electric window buttons at the same time, has the same effect

**robmawer** · 07-09-2006, 09:40

Quote:

Originally Posted by bengie

the rad for the aircon is infront of the engine rad so how can they have different fans

I have two fans side-by-side between the radiator and the engine...

Rob.

TeflonTom · 07-09-2006, 09:43

Quote:

Originally Posted by robmawer

I have two fans side-by-side between the radiator and the engine...

Rob.

aren't the fans on an octavia joined by a rubber drive belt?? or are they independant?

**robmawer** · 07-09-2006, 09:45

Quote:

Originally Posted by TeflonTom

aren't the fans on an octavia joined by a rubber drive belt?? or are they independant?

Not too each other...they run independently.

Unless it's just a peculiarity of the engine I've got...or the car (not beyond the realms of possiblity

)...

Rob.

TeflonTom · 07-09-2006, 09:47

Quote:

Originally Posted by robmawer

Not too each other...they run independently.

Unless it's just a peculiarity of the engine I've got...or the car (not beyond the realms of possiblity

)...

Rob.

no no, i'm probably just wrong again!!

i know the the early golfs and corrado's that had twin fans also had onlt one motor to drive the fans ans there wasa little belt linking them together

Lummox · 07-09-2006, 09:47

Independant fans, both on the rear of the radiator (tut tut Bengie).

bengie · 07-09-2006, 10:04

pfft, bovvard? i'm gonna go stick my nuts in the freezer to clear my head

**mannyo** · 07-09-2006, 10:11

on the octavia vrs, both fans should run all the time with the a/c on. The fact that the air is also passed over the coolant rad to get to the condensor shouldnt be a problem if the thermostat is doing its job because no water will flow through the rad if cooling is not required. They are switched from the same source, so if only one is going then the chances are one of the motors has seized/ burnt out. This happened to Jon at the ring, and his car was fine until pressed hard then it overheated with just one fan working.

07-09-2006, 08:20	#1
Neily03 Briskodian Join Date: Jan 2006 Location: Knutsford Posts: 859 Thanks: 3 Thanked 5 Times in 5 Posts	Revs drop when fan kicks in.. When stationary with the engine just ticking over and the radiator fan kicks in the rev's drop by about 100rpm with a small shudder, just for a split second. Is this normal for the vRS? In my last car you couldn't tell when the fan came on.... __________________ *Black Magic MY07 Fabia v/RS with Cruise, Xennons, Heated Seats, Dension Ice-Link+, Aero wipers & Jabba RARB.*

07-09-2006, 08:21	#2
Goochie Briskodian Join Date: Jan 2004 Location: Up a tree. Posts: 12,363 Thanks: 7 Thanked 27 Times in 25 Posts	Re: Revs drop when fan kicks in.. It's putting load on the alternator and hence, the engine. Perfectly normal.

07-09-2006, 08:41	#4
TeflonTom Briskodiodion Join Date: May 2006 Location: Hayling Island, Hampshire Posts: 8,201 Thanks: 46 Thanked 231 Times in 203 Posts	Re: Revs drop when fan kicks in.. i would have said that it wouln't make much difference when the fan comes on! i would check the battery/alternator to check it is charging properly

07-09-2006, 09:10	#6
mannyo BRISKODA Staff Join Date: Nov 2002 Location: Stevenage Herts. Posts: 11,439 Thanks: 56 Thanked 356 Times in 328 Posts	Re: Revs drop when fan kicks in.. Try running with the Aircon on, that should switch the fans on permanently. __________________ Manny 2005 Octavia 2.0TDi Elegance combi my skoda website http://www.octaviars.co.uk Join the briskoda.net folding team click Here for more info

07-09-2006, 09:36	#13
bengie splash!!!! Join Date: Feb 2004 Location: planet earth Posts: 15,208 Thanks: 17 Thanked 144 Times in 125 Posts	Re: Revs drop when fan kicks in.. the rad for the aircon is infront of the engine rad so how can they have different fans and don;'t worry about it every car i've had has done this press two electric window buttons at the same time, has the same effect __________________ owner of a skoda octavia 4xvrs3

07-09-2006, 09:47	#18
Lummox Cupra Bush King Join Date: Sep 2003 Location: Newport Pagnell Posts: 22,276 Images: 2 Thanks: 22 Thanked 734 Times in 616 Posts	Re: Revs drop when fan kicks in.. Independant fans, both on the rear of the radiator (tut tut Bengie). __________________ Unit 18 Automotive Services www.unit18.co.uk

07-09-2006, 10:04	#19
bengie splash!!!! Join Date: Feb 2004 Location: planet earth Posts: 15,208 Thanks: 17 Thanked 144 Times in 125 Posts	Re: Revs drop when fan kicks in.. pfft, bovvard? i'm gonna go stick my nuts in the freezer to clear my head __________________ owner of a skoda octavia 4xvrs3

07-09-2006, 10:11	#20
mannyo BRISKODA Staff Join Date: Nov 2002 Location: Stevenage Herts. Posts: 11,439 Thanks: 56 Thanked 356 Times in 328 Posts	Re: Revs drop when fan kicks in.. on the octavia vrs, both fans should run all the time with the a/c on. The fact that the air is also passed over the coolant rad to get to the condensor shouldnt be a problem if the thermostat is doing its job because no water will flow through the rad if cooling is not required. They are switched from the same source, so if only one is going then the chances are one of the motors has seized/ burnt out. This happened to Jon at the ring, and his car was fine until pressed hard then it overheated with just one fan working. __________________ Manny 2005 Octavia 2.0TDi Elegance combi my skoda website http://www.octaviars.co.uk Join the briskoda.net folding team click Here for more info Last edited by mannyo; 07-09-2006 at 10:13.

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