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Discussion Starter · #1 ·
Just had the coolant sensor replaced, but the fans stay on after turning off engine. No fault codes or warning light though...
 

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Do the fans stay on when the engine is hot, or does it happen even when the engine is cold (ie. switch engine on, then off again)?

Might be worth checking the relays, corroded pins can cause all sorts of havoc
 

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Discussion Starter · #3 ·
Engine was at 70 when fans stayed on. What pins am I looking for? Literally had the sensor changed an hour ago so hoped it would have sorted it.
 

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probably not the relay then, check the sensor is actually plugged in properly.

I think on the 207 the adaptives might need resetting on diagbox, the ecu may be thinking that the temp is higher than it actually is.

What engine is the car?
 

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Danj,

After replacing my coolant sensor a few weeks ago my temp. gauge started going straight to max and the fans would stay on for 5 mins after engine shutdown.

After unplugging the battery for a while and also unplugging and reconnecting the ecu the problems stopped. Seems in my case the system needed to reset itself somehow.

Think i was advised this should be done by clearing codes using planet/diagbox as this removes them from both the BSI and ECU. However in my case the above did the trick.
 

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Diagbox is the diagnostics tool written for PSA vehicles, it should be specialist but it's readily available on ebay.

You could try a BSI reset, which scoey1001 kind of did. The correct procedure is as follows;

- Put the driver's window down, lift the bonnet and ensure all equipment is switched off.

- Ensure all doors are closed and remove key from the ignition.

- Wait for 3 minutes, disconnect the vehicle battery and wait 15 seconds.

- Reconnect the vehicle battery, wait a further 10 seconds (do not open doors.).

- Switch on the side lights through the driver's window.

- Switch on the ignition and check system's functionality.

- Hold lock button on key down for 10 seconds.

- Remove key open & close door test central locking system.

- Start the engine and complete the system's check.


Failure to follow this procedure could result in incorrect operation of many BSI related items.
 

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Could be a bad contact on the relay, common fault on the 307 where dirt gets on the contacts of the relay under the bonnet slam panel.

Disconnect and give a good spray with electrical contact cleaner.
 
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