RS2 owner needs advise from the experts

**Stick Insect** · 8 June 2004, 20:57

Paul welcome to the forum

I don't remember if the fan on my CQ20V runs on after? I don't remember it doing so!

There are all sorts of things which the turbo lads may be able to advise on.

Boost leak?

David

**Dr H** · 8 June 2004, 21:34

My fan always stops when I turn the ignition off.

It nevers runs on continually after i turn off the engine. Only a very few times has it ever come on again afterwards whilst the car is sitting - although it did do it the other day.

**Martynf** · 8 June 2004, 21:35

Hi Paul and welcome to the board!

The run on issue, the fan should indeed run on! I would get to the bottom of this one pretty quickly if you can. You would be very wise to check to see if the small electric water pump is working too once the ignition is off. If that one isn't working, then you could get some serious heat problems under the hood!

Things I'd do 1st in this sequence:

Check the fuse for the fan (you've done - no change)
Does the fan work at all? (probably does) so that can only leave.... either the temp. switch has expired, or maybe... the plug is off the switch!

As long as you know the rad fan is working at some point whilst you're driving, then we know the rad fan is ok as it uses speed two when the ignition is off. Speed one is only for when the air con is on, and speed three is a flat out hardly used speed really.

I am pretty sure that the switch for the after run fan is the two pin one in the water manifold, also take a look at the bigger switch in the manifold, just to make sure all teh plugs are on good. Maybe you'll get lucky and notice the plug is off!

Assuming the plug is on the switch, you have to assume the switch has probably had it. Replace.

What I suggest you also do is to check the electric afterrun pump too. Get the engine nice and hot and turn her off (so the fan *should* run!) loosen the header tank cap just a bit so the pressure in the water systems is released. Stand and watch the water level in the header tank, if the afterrun electric pump IS WORKING, then the water level in the tank will rise (only when it turns on though! so give it a few minutes)

If the fan doesn't come on and the water level in the tank does not rise, you have a problem! suspect the temp. switch is faulty and replace it.

Will try to find you a picture of the switches.

Hope this helps?

As for the holding back, I'll let someone else answer that (boost leak!! again!!) whilst I find you a picture!

Martyn

**Martynf** · 8 June 2004, 21:42

Here you go:

http://www.vagparts.com/s2/d2/switchesinstalled.jpg

http://www.vagparts.com/s2/d2/switches.jpg

Martyn

**martinjs** · 8 June 2004, 21:54

My fan turns off with the ignition also, and my after run pump doesnt work, i have changed the smaller sensor in the manifold, will be trying another relay for the after run pump soon, its never worked since ive had it (nearly 2 years)
your after run pump should run for a few seconds when you turn the ignition on.
mine does and it also comes on (with the main fan also) if i join the 2 terminals together on the smaller sensor in the water manifold. i lost my patience with this a while ago but want it sorting asap really.

martin

**Bluekermit** · 8 June 2004, 21:56

Originally posted by Martynf

Hi Paul and welcome to the board!

The run on issue, the fan should indeed run on! I would get to the bottom of this one pretty quickly if you can. You would be very wise to check to see if the small electric water pump is working too once the ignition is off. If that one isn't working, then you could get some serious heat problems under the hood!

Things I'd do 1st in this sequence:

Check the fuse for the fan (you've done - no change)
Does the fan work at all? (probably does) so that can only leave.... either the temp. switch has expired, or maybe... the plug is off the switch!

As long as you know the rad fan is working at some point whilst you're driving, then we know the rad fan is ok as it uses speed two when the ignition is off. Speed one is only for when the air con is on, and speed three is a flat out hardly used speed really.

I am pretty sure that the switch for the after run fan is the two pin one in the water manifold, also take a look at the bigger switch in the manifold, just to make sure all teh plugs are on good. Maybe you'll get lucky and notice the plug is off!

Assuming the plug is on the switch, you have to assume the switch has probably had it. Replace.

What I suggest you also do is to check the electric afterrun pump too. Get the engine nice and hot and turn her off (so the fan *should* run!) loosen the header tank cap just a bit so the pressure in the water systems is released. Stand and watch the water level in the header tank, if the afterrun electric pump IS WORKING, then the water level in the tank will rise (only when it turns on though! so give it a few minutes)

If the fan doesn't come on and the water level in the tank does not rise, you have a problem! suspect the temp. switch is faulty and replace it.

Will try to find you a picture of the switches.

Hope this helps?

As for the holding back, I'll let someone else answer that (boost leak!! again!!) whilst I find you a picture!

Martyn

Martyn,

Thanks for all the advise, lots to check.

I know you !!!!..... silver S2 Avant ??, VAGPARTS Martyn ??... You have supplied a lot of parts for my car(s) (90 Quattro Sport 20v and RS2) in the past not to mention fantastic advice, thanks.

You might remember that I had both these temp sensor changed when I had the new radiator and hoses. I know that the water pump is working, had that checked bu AH Autos. IT SHOULD WORK..... I will go through your advice , maybee I have missed something...

Thanks again..

PAUL B
1995 RS2...

**Martynf** · 8 June 2004, 22:09

Hey, small world!!!!

Yup t'is me indeed!! wondered where you'd got to!! haven't seen you since..... a track day about a year ago!!

Yup, I do remember you had those changed yes, do check again Paul as above, if you can confirm the plugs are on good unyet neither the fan nor after run pump are working working, then we have a problem Housten!!

Good luck Paul!!

**SteveH** · 8 June 2004, 22:14

Welcome Bluekermit

**DAVIDP20V** · 8 June 2004, 22:22

hello bluekermit .

small world indeed, i told you the fan should run on ! hehehe

David

**Bluekermit** · 8 June 2004, 22:29

Originally posted by DAVIDP20V

hello bluekermit .

small world indeed, i told you the fan should run on ! hehehe

David

David

Yea, OK, OK, I know...you told me so... but there was another poor unfortunate who's fan does not run-on...... I agree with you, I want it to run-on...

I now have a lot of leads to check...

Did you come up behind me on the road between Guildford and Leatherhead, Silver RS2.. ??

**Dr H** · 8 June 2004, 22:29

Oh b@lls!

Does this mean mine is fooked? The fan goes off when I turn the ignition off but has come on a few minutes later after the car has been stood and is all locked up

**Bluekermit** · 8 June 2004, 22:31

Originally posted by Dr H

Oh b@lls!

Does this mean mine is fooked? The fan goes off when I turn the ignition off but has come on a few minutes later after the car has been stood and is all locked up

No, No..... thats how it should be......MINE'S FOOKED...

**Dr H** · 8 June 2004, 22:36

Originally posted by Bluekermit

No, No..... thats how it should be......MINE'S FOOKED...

**DAVIDP20V** · 9 June 2004, 07:21

Wasnt me matey.

RS2 owner needs advise from the experts

RS2 owner needs advise from the experts

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