Peugeot 407 1.6 HDi 2005 overrunning fan at switch off and flat battery? HELP! - Peugeot Forums
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Old 26-03-11, 09:03 PM   #1
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Default Peugeot 407 1.6 HDi 2005 overrunning fan at switch off and flat battery? HELP!

Hi guys,
Thanks for taking the time to read this and possibly help me out. I recently bought a 407 '05 1.6 HDi saloon for what I thought was peanuts. We've had a few issues with it (only had it 4 weeks!), first the brake servo went on the motorway resulting in no assisted brakes and hard brake pedal/ hardly any brakes and the screen goes blank after it warms up so you can't change the temperature, etc. (If anyone knows of cheap replacement screens please let me know or even instructions on how to remove it so I can see if the connectors are worn).

Anyway my reason for being on here is to find a solution to the fan that seems to run flat out every 4-5 switch offs to such an extent that it normally flattens the battery. It's been into the main dealer and had all the software updates put on it and although there were fault codes present, these are now cleared. From what little I have found about related problems using Google the issue should have been fixed with the software update. Apparently the latest software still allows the fan to blow for the same amount of time, but at significantly reduced speed thereby reducing the energy use and saving the battery.

It might be worth me mentioning that there is a very faint burning smell while the fan is running. Can anybody confirm if they experience the same thing on their vehicle? I should imagine it applies to all 1.6 HDi models 206 maybe, 207 and 307?

The battery can only have been replaced recently as the date of manufacture on it is Oct 2010.

Any help would be very much appreciated as leaving it to the main dealers to fix is not an option an our budget.

Many thanks.
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Old 26-03-11, 09:06 PM   #2
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There is a software update alright for this problem.
I'd also bet you have heater plug problems. Get a diagnostic check done.
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Old 26-03-11, 09:06 PM   #3
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seen this enough times on here...basically replace the thermostat and/or temp sensor and your good



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Old 26-03-11, 09:10 PM   #4
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seen this enough times on here...basically replace the thermostat and/or temp sensor and your good
I disagree. Do not do this. This is the result of the car trying to do a regeneration and can't because of say one or more heater plugs have failed or another problem.
Diagnostic check!
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Old 26-03-11, 09:14 PM   #5
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Originally Posted by davidireland View Post
I disagree. Do not do this. This is the result of the car trying to do a regeneration and can't because of say one or more heater plugs have failed or another problem.
Diagnostic check!
im just mentioning what ive seen posted plenty of times and it fixed the fault



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Old 26-03-11, 09:18 PM   #6
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Wow, you guys are quick at responding! Thanks!

I should have been clearer in original post - the software update has been done at main dealer yesterday. Few stop starts then no fan at all, great! Then just tonight the fan came on again after switch off and the battery went flat.

Are the sensors an easy fix? Can anyone confirm if the fan is running to cool the engine or is it this regeneration thing, whatever that is that is the reason for the fan? If we are talking engine temp sensors, all the dash temps come up at warm up as you would expect.
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Old 26-03-11, 09:20 PM   #7
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Its just a regeneration thing. Did they read the engine ecu? Any faults?
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Old 26-03-11, 09:35 PM   #8
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All they said was that there were error codes, but they were all non-permanent and they cleared them. Probably worth me getting another diagnostics done I guess at the local garage so I can stand there and have a look while he's doing it.
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Old 26-03-11, 09:38 PM   #9
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Exactly. Post up your faults here then.
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Old 28-03-11, 12:59 PM   #10
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I have a 54 reg 407SW 1.6HDi and have exactly the same problems as you. Basically the car is trying to do a regeneration but cant as you turn the ignition off so turns the fan on to cool everything down. This in turn flattens the battery which is exactly what mine does. As for the burning smell - thats the regeneration process and nothing to worry about
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