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Author Subject: Fan runs when ignition switched on
ProjectGTI 6

Junior User

Location: Hayes

Registered: 09 Jul 2020

Posts: 76

Status: Offline

Post #1
Hi All,
When I start the engine or turn on the ignition the lefthand fan runs. I have replaced the three fan relays in the triangle box in the fan assembly so was wondering if it is the Bitron ECU in the inner wing. Any ideas???
Smile

________________________________________

Phil Goodson
405 Mi16 Phase 1 until 2002
306 Gti6 current project car
405 Mi16 LeMans current project car
505 Gti Estate current project car
Audi S4 daily
Posted 14th Jul 2020 at 21:23
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,819

Status: Offline

Post #2
thats Normal

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need a part number? get on here - http://public.servicebox.peugeot.com

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Posted 14th Jul 2020 at 23:10
ProjectGTI 6

Junior User

Location: Hayes

Registered: 09 Jul 2020

Posts: 76

Status: Offline

Post #3
Oh OK thanks Welshpug. I bloke I bought it from had wired in an override switch directly to the fans via the relay holder and one relay was missing so I have replaced all three of them. I am hoping that it will be OK now but am not sure why a dash switch was added unless there was a problem elsewhere. It goes without saying that the Air Con is shot!!

________________________________________

Phil Goodson
405 Mi16 Phase 1 until 2002
306 Gti6 current project car
405 Mi16 LeMans current project car
505 Gti Estate current project car
Audi S4 daily
Posted 15th Jul 2020 at 08:51
rudolf

Seasoned Pro

Location: Skelmersdale

Registered: 07 Apr 2004

Posts: 2,769

Status: Offline

Post #4
welshpug! wrote:
thats Normal


How can it be normal when both fans either both run on low in series or high in parallel?

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S Reg Diablo standardsSpec SORNED
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Posted 15th Jul 2020 at 15:33
ProjectGTI 6

Junior User

Location: Hayes

Registered: 09 Jul 2020

Posts: 76

Status: Offline

Post #5
The odd thing is that the fan seems to run at fast speed even when the car is started from cold. Also I know both fans run as I have powered them via the direct connection that was made. When I disconnect the brown wire on the thermostat it does not run the second fan which I believe it should do. Confused.

________________________________________

Phil Goodson
405 Mi16 Phase 1 until 2002
306 Gti6 current project car
405 Mi16 LeMans current project car
505 Gti Estate current project car
Audi S4 daily
Posted 15th Jul 2020 at 17:25
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,819

Status: Offline

Post #6
when ac is on they run one fan all the time.

fans should both run afaik with the brown sensor disconnected.


thats just how I understand its mwant to work.

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 15th Jul 2020 at 19:43
stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

Status: Offline

Post #7
ProjectGTI 6 wrote:
The odd thing is that the fan seems to run at fast speed even when the car is started from cold. Also I know both fans run as I have powered them via the direct connection that was made. When I disconnect the brown wire on the thermostat it does not run the second fan which I believe it should do. Confused.


Both fans should run together at low speed, you are correct.
You need to trace back through the wiring to see why this isn't happening, I would imagine the bitron unit (unit which runs the fan system) has failed at some point, hence why somebody has wired in a manual fan switch.

________________________________________

"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 15th Jul 2020 at 20:11
stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

Status: Offline

Post #8
welshpug! wrote:
when ac is on they run one fan all the time.


No they don't, both fans run at low speed when AC is switched on.

________________________________________

"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 15th Jul 2020 at 20:12
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,819

Status: Offline

Post #9
ha, so theres a broken fan then lol


shows how long its been since I saw one with working ac/fans

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 16th Jul 2020 at 08:52
ProjectGTI 6

Junior User

Location: Hayes

Registered: 09 Jul 2020

Posts: 76

Status: Offline

Post #10
So it looks to me that the system is very confusing and not particularly robust. Perhaps it is easier to keep the manual fan override seeing as one fan works and there is no AC to warrant the second fan. Thoughts???

________________________________________

Phil Goodson
405 Mi16 Phase 1 until 2002
306 Gti6 current project car
405 Mi16 LeMans current project car
505 Gti Estate current project car
Audi S4 daily
Posted 16th Jul 2020 at 10:43
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,819

Status: Offline

Post #11
no, that's just a bodge, even the newest is 20 years old now so a little corrosion on terminals and wiring is to be expected, fix that and it'll work like intended again.

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 16th Jul 2020 at 13:25
ProjectGTI 6

Junior User

Location: Hayes

Registered: 09 Jul 2020

Posts: 76

Status: Offline

Post #12
Yes you are dead right it is a bodge. I think I will check the Bitron box again but it looked pretty clean to me on the terminals. Will also give the relay holders a real good clean.

________________________________________

Phil Goodson
405 Mi16 Phase 1 until 2002
306 Gti6 current project car
405 Mi16 LeMans current project car
505 Gti Estate current project car
Audi S4 daily
Posted 16th Jul 2020 at 21:20
alcon

Senior User

Location: Glasgow

Registered: 19 Jan 2005

Posts: 932

Status: Offline

Post #13
I always thought that both fans always run together (when running) and that they have two speeds. That would mean that if only one fan is running then there must be a problem with the other.

________________________________________

1999 GTi-6 (china blue)
1999 Rallye (black)
Posted 17th Jul 2020 at 16:06
ProjectGTI 6

Junior User

Location: Hayes

Registered: 09 Jul 2020

Posts: 76

Status: Offline

Post #14
I only have one working (left side) and what sounds like full tilt. I have ordered a new Bitron unit to see if that solves the issue. I know the right side fan works as we have powered it and it runs. All relays are replaced so if the Bitron unit does not fix it I wonder if it is a bad earth or wiring issue to the second fan.

________________________________________

Phil Goodson
405 Mi16 Phase 1 until 2002
306 Gti6 current project car
405 Mi16 LeMans current project car
505 Gti Estate current project car
Audi S4 daily
Posted 17th Jul 2020 at 16:39
alcon

Senior User

Location: Glasgow

Registered: 19 Jan 2005

Posts: 932

Status: Offline

Post #15
Definitely check all connections and test for continuity where you can. It only takes one crusty green spade connector to bring the whole system down

________________________________________

1999 GTi-6 (china blue)
1999 Rallye (black)
Posted 17th Jul 2020 at 21:07
ProjectGTI 6

Junior User

Location: Hayes

Registered: 09 Jul 2020

Posts: 76

Status: Offline

Post #16
Definitely a plan there. Hopefully will get it sorted.

________________________________________

Phil Goodson
405 Mi16 Phase 1 until 2002
306 Gti6 current project car
405 Mi16 LeMans current project car
505 Gti Estate current project car
Audi S4 daily
Posted 18th Jul 2020 at 22:41
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,819

Status: Offline

Post #17
common place for corrosion is also the small round multiplug from the chassis loom to the fan cowling subloom.

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 19th Jul 2020 at 10:56
ProjectGTI 6

Junior User

Location: Hayes

Registered: 09 Jul 2020

Posts: 76

Status: Offline

Post #18
Great, I will have a look around when I get a chance. The earth points near the battery look bit crusty on the outside so might refit once given them a quick once over with a wire brush. Probably worth doing I think.

________________________________________

Phil Goodson
405 Mi16 Phase 1 until 2002
306 Gti6 current project car
405 Mi16 LeMans current project car
505 Gti Estate current project car
Audi S4 daily
Posted 19th Jul 2020 at 21:49
ProjectGTI 6

Junior User

Location: Hayes

Registered: 09 Jul 2020

Posts: 76

Status: Offline

Post #19
Just a quick update. I have tried a new Bitron unit but the problem was not solved. Tested for continuity with wiring from the Bitron back to the relays and from relay to relay and change over relay and all seems to be OK there.The left fan runs at full tilt as soon as you turn the ignition key to accessory position, I am sure the fan should only run once the engine starts. I am wondering if the temporary fix that was put in before I got the car is responsible for the problem. I can get both fans to run at normal speed if I put a relay in and short pins 3 and 5 in the other. I suppose a fan running all the time is slightly better than no fan but I would ideally like to get it sorted.

________________________________________

Phil Goodson
405 Mi16 Phase 1 until 2002
306 Gti6 current project car
405 Mi16 LeMans current project car
505 Gti Estate current project car
Audi S4 daily
Posted 23rd Jul 2020 at 20:52
AlMortz

Junior User

Location: Bristol

Registered: 07 May 2019

Posts: 80

Status: Offline

Post #20
Recently just fixed the fans on mine.

On my 6, the left hand relay controls the passenger side fan. And the right hand relay controls the driver's side fan.

For them both to run at normal speed, only the left hand relay is energised and shares the 12v between both fans.

For them both to run at high speed, all three relays are energised and both fans get 12v.

How exactly are your fans working? Both on high speed only, only the driver's side on normal speed? Noticed earlier you said that only the driver's side is working on full speed, but just above now both work on normal?
Posted 23rd Jul 2020 at 21:32
ProjectGTI 6

Junior User

Location: Hayes

Registered: 09 Jul 2020

Posts: 76

Status: Offline

Post #21
Yes my relays are positioned the same as you say. I only get one fan to run drivers side at full speed even thought the engine has not been started. However when I short the left relay and put the relay in the right connector both run at slow speed. I think that is right however it might the the other way around. It is all bit confusing.

________________________________________

Phil Goodson
405 Mi16 Phase 1 until 2002
306 Gti6 current project car
405 Mi16 LeMans current project car
505 Gti Estate current project car
Audi S4 daily
Posted 23rd Jul 2020 at 21:45
AlMortz

Junior User

Location: Bristol

Registered: 07 May 2019

Posts: 80

Status: Offline

Post #22
Yeah strange.

You say you "put the relay in the right connector" does that mean you only have one relay? You should have 2 green relays and one black one by the fans. I might have misunderstood what you meant there but worth an ask.
Posted 23rd Jul 2020 at 21:48
ProjectGTI 6

Junior User

Location: Hayes

Registered: 09 Jul 2020

Posts: 76

Status: Offline

Post #23
No got both relays which are new and of course the change over relay. Even got a new Bitron unit as a test but still the same. I am slightly confused now. I understand that if I unplug the temp sensor both fans should run on full speed, however they don't. Very odd scratchy head time.

________________________________________

Phil Goodson
405 Mi16 Phase 1 until 2002
306 Gti6 current project car
405 Mi16 LeMans current project car
505 Gti Estate current project car
Audi S4 daily
Posted 23rd Jul 2020 at 21:55
ProjectGTI 6

Junior User

Location: Hayes

Registered: 09 Jul 2020

Posts: 76

Status: Offline

Post #24
Oh should have said that if I remove one of the relays I can get both fans to run at normal speed.

________________________________________

Phil Goodson
405 Mi16 Phase 1 until 2002
306 Gti6 current project car
405 Mi16 LeMans current project car
505 Gti Estate current project car
Audi S4 daily
Posted 23rd Jul 2020 at 21:57
ProjectGTI 6

Junior User

Location: Hayes

Registered: 09 Jul 2020

Posts: 76

Status: Offline

Post #25
Sorry also once I short pins 3 and 5

________________________________________

Phil Goodson
405 Mi16 Phase 1 until 2002
306 Gti6 current project car
405 Mi16 LeMans current project car
505 Gti Estate current project car
Audi S4 daily
Posted 23rd Jul 2020 at 21:58

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