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Peugeot 308 - Peugeot 308, 2010 Petrol 1.6l Noisy fan - Russel

hi,
recently bought a used Peugeot through a dealer, it's Peugeot 308, 1.6l Petrol sports model 2010 registered.
however of late, i noticed that the fan is coming on all the time. Even in the cold morning days, fan continues to make noise until the engine is stopped at which point fan promptly stops.
Engine temperature never exceeds 90 though. CHecked the radiator fluid levels which are fine too.
Just this noisy fan is irritating.
Been to a local dealer who palmed me off £110 to replace a temperature sensor that did not help resolve the issue.

Then took it back to the garage who checked on the fuse box with a tester and it started to glow.....not sure whatever it means.
Also, the mechanic disconnected the connection between battery and fan and fan did not stop, mechanic thinks it should stop if it were a temp sensor error. Mechanic now says may be a corrupt ECU or fuse board or something.

bit of background.Initially after the car was bought few months ago it was working fine with no fan issue. But AC was not working so took it back to the dealer.
Dealer had said the compressor was gone so he replaced the compressor AND SINCE then the fan is coming on. Dealer also said relay to AC was not workign so he said he had also replaced fuse box as well that got the AC back up and running....but the fan issue not solved. by the time the warranty offered by dealer was over and he dusted his hands off.

really annoyed as recently found a job that requires driving 50 miles a day and really want to sort this out.
any help as to what may be causing this issue would help.
if anyone gone through similar issue, please respond what helped them to get round hte issue....really have a sick feeling after going around hte garages more than half a dozen times with no fix, effort, times and monies wasted. when checked for errors no error codes were reported on onboard computer too.
appreciate the help.

Peugeot 308 - Peugeot 308, 2010 Petrol 1.6l Noisy fan - hardway

Take it to an autospark.

Peugeot 308 - Peugeot 308, 2010 Petrol 1.6l Noisy fan - Russel

Whats the rationale for that please.

Unfortunately the nearest one from where I live is 40 miles away.

Really appreciate if you can explain what is the issue with this car....

Peugeot 308 - Peugeot 308, 2010 Petrol 1.6l Noisy fan - elekie&a/c doctor

The cooling fan on these can activate under various conditions. Faults in the engine control system, excess coolant temp and a/c operation are just a few. Try running the engine with the a/c system completly switched off. Also,make sure the engine oil filler cap is correctly fitted and secure.

Peugeot 308 - Peugeot 308, 2010 Petrol 1.6l Noisy fan - Russel

Thanks for your response.

I wasn't using AC at all. Will check the oil filler cap as you mentioned.

Peugeot 308 - Peugeot 308, 2010 Petrol 1.6l Noisy fan - hardway

"the mechanic disconnected the connection between battery and fan and fan did not stop,"

So the fan is getting feed from somewhere it's not supposed to,

A short circuit,

Peugeot 308 - Peugeot 308, 2010 Petrol 1.6l Noisy fan - Russel

"the mechanic disconnected the connection between battery and fan and fan did not stop,"

So the fan is getting feed from somewhere it's not supposed to,

A short circuit,

thanks for your kind response.

but could you please tell where and what to check for?

Is it worth checking with a specialist or electrical specialist? it feels like a normal garage cannot fix this.

appreciate your response.

regards,

Russel.

Peugeot 308 - Peugeot 308, 2010 Petrol 1.6l Noisy fan - Gibbo_Wirral

The 307 used to suffer from a similar issue - fan coming on and not switching off.

The problem was due to dirt ingress over time to the relay contacts under the bonnet slam panel.

The 308 is very similar in design to the 307, so the first thing I'd do is check if the relays are in the same place, and if so, give the connections a really good clean with electrical contact cleaner.

Peugeot 308 - Peugeot 308, 2010 Petrol 1.6l Noisy fan - Railroad.

The ECM will switch a relay to operate the fan. It's most likely that the relay contacts are stuck closed, causing the fan to run permanently. This should be very easy to check, and well within the capabilities of any competent technician.

Peugeot 308 - Peugeot 308, 2010 Petrol 1.6l Noisy fan - Russel

Thank you all for your valuable inputs.

Took car to a local Peugeot specialists. Garage just called to tell me car is ready for collection. They say an alternator was replaced in the past with after market one which was not an exact fit... Alternator was causing the fan to come on.

He said he tried his best to fix the issue and fan doesn't come on now.... At least the guy seems to know what he is doing and charging £80....I really wouldn't mind paying that..... Really hope the issue is resolved.

I will I update once after I collected car and driven it couple of days.

Edited by Russel on 24/09/2018 at 15:42