Peugeot 307 - Coolant temperature issue | Technical matters | Back Room Forum

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Fri 31 Aug 2018 12:41

Peugeot 307 - Coolant temperature issue - PeugeotJoe

Hi all

I’ve had my Peugeot 307 1.4 (2003) for a few months now, passed its MOT with no advisories last month.

In the past week, I've started having a few issues. The main one is the coolant temperature. On the dash, after around 10 mins, the indicator flies up to max and the STOP sign beeps on the dash. It doesnt stay there permanently - it drops down below half way from time to time only to shoot back up.

I know very little about cars other than to say there doesnt feel anything wrong nor is it making any unusual sounds. Its very quiet as always and seems to be pulling well as it jas since I had it.

Perhaps unconnected, but the standard temperature on the dash is also showing permanently as 39/40/41 even when the car hasnt been running. That probably is totally unrelated, but seemed to happen at the same time.

If anyone can suggest any advice, would be much appreciated.

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Fri 31 Aug 2018 13:01

Peugeot 307 - Coolant temperature issue - Cris_on_the_gas

Check the coolant level in the header tank.

If OK when was the coolant last checked.

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Fri 31 Aug 2018 15:52

Peugeot 307 - Coolant temperature issue - PeugeotJoe

Thanks for the reply.

The coolant level seems OK, about midway between min and max. I would say i last checked it in Feb/Mar time

Edited by PeugeotJoe on 31/08/2018 at 15:53

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Fri 31 Aug 2018 16:00

Peugeot 307 - Coolant temperature issue - elekie&a/c doctor

Coolant temp sensor is the most common failure on these. Located on the stat housing. It is a push fit with an o ring and securing clip.

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Fri 31 Aug 2018 16:00

Peugeot 307 - Coolant temperature issue - hardway

Might be wrong here but I've got this thing in my head,

A faulty CTS lets coolant out through into the multi plug then up the wiring harness.

Creates a wiring short circuit hence the screwy reading on the panel/gauge.

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Fri 31 Aug 2018 17:25

Peugeot 307 - Coolant temperature issue - PeugeotJoe

Thanks all. The CTS seems to be a common theme so ill start there.

Any recommendations on where im best to buy one from? Found loads of different ones online, are they all much of a muchness or am I best to try somewhere specific? Appreciate everyone’s help with this, cheers.

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Fri 31 Aug 2018 21:27

Peugeot 307 - Coolant temperature issue - hardway

I'm afraid when it comes to sensors I always try to buy at least O/E or from one of the better name makes.

Seen to many complicate thing by poor manufacture or wonky readings,

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Tue 4 Sep 2018 13:35

Peugeot 307 - Coolant temperature issue - Gibbo_Wirral

OP - its a common fault on 307s. A replacement sensor from Euro Car Parts will sort it.

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