Hi all, after some more of your technical expertise.

Today on my way to work I encountered some traffic and after a couple of minutes as I always do glanced at the coolant temp gauge. You can imaging my surprise to find it not at the expected 85-90 but somewhere around where 140 would be if the gauge read that far. Cue initial panic!

A few seconds of thought later and I looked at my oil temp gauge and saw it was at it's normal 90, so calmed down a bit and tried to think things through.

First thoughts were that no way should it read that high and the engine still run normally. I know my car and when it gets really hot, ie. the fans have come on 5-6 times in succession without remorse the car starts to hunt slightly and throttle response is a little wooly. There was none of this behaviour.

Also the rad fan had not kicked in to this point

Also, I believed, and this is where I may be wrong, the engine STOP light should have come on way before as a warning? Am I right in this or is the blue temp sender a 2 pin jobbie as it serves gauge and STOP light?

Anyway checked coolant, re-bled system (all 3 bleed points) etc and all fine, gauge seemed to function correctly from cold but quickly went into overdrive. Thermostat opened at indicated 90, Fans came on at indicated 110 but my feel was that the engine just was not as hot as that reading. Drove car home after work absolutely s**tting myself and stopping frequently to check everything.

Checked car again after cooling down at home and gauge reads 140 when cold.

I think, and have ordered a new blue temp sensor and expect it to solve this.

My question is - does that sound right to you? Especially my logic about the STOP light?

I plan to drive it to work tomorrow too. Obviously not ideal but I'm as sure as I can be there is nothing wrong with the engine or coolant syatem

BTW it's a non A/C Rallye

I know that's a long read but thought it best to give all the info first off


Barry

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China D Turbo HDi daily charger
Black Rallye occassional toy

Thanks for the reply mate.

Mu initial suspicion was indeed head gasket. Now I am pretty sure, or at least hopeful it isn't that.

Mine has used no water and doesn't just hit the red, it goes straight past it and out the other side, all without the fans coming on.

As I said above even when almost cold to the touch the gauge still reads well past the red, and the stop light hasn't come on. Is the stop light controlled, as I thought, by the green sensor?

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China D Turbo HDi daily charger
Black Rallye occassional toy

stop light is one pin of the blue sender, temp gauge is the other one.

green is purely ecu, brown is AC models only.


non ac model fans are controlled by three pin thermoswitch under the top hose.

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

Bring on the Trumpets.

Thanks welshy!

So could a blue 2 pin sensor over read on the temp gauge but not illuminate the STOP light as I am experiencing?

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China D Turbo HDi daily charger
Black Rallye occassional toy

also check the earths from the gearbox to the chassis and to the battery

Thanks for that, I am so glad it is possible!

It was the silly numbers that really seemed odd to me. if the car sat in the red it would have stayed where it was and got towed, but going way past just didn't add up.

Will keep fingers crossed and hope the new sensor cures it.

Had a new Bosch sensor last month and hesitation didn't happen before cambelt was replaced last week

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China D Turbo HDi daily charger
Black Rallye occassional toy

So you have a new bosch lamda sensor and it didnt hessitate. Now the cambelts been done, its hessitating m

Who did the cam belt?

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***Breaking*** Ph3 Silver GTI 6 High Boost

Suppose it could be down to the coolant senor to. Well if it was hessitating alot then i would say it could be the timing but if it seems ok after the first cough then its probably not.

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***Breaking*** Ph3 Silver GTI 6 High Boost

Ok so new sender turned up today. Just fitted it and taken car for a test drive and......

problem solved!

Gauge works properly and temps are absolutely normal, no coolant lost over the last 2 days, or ever even.

Thanks for everyones help, very much appreciated.

Barry

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China D Turbo HDi daily charger
Black Rallye occassional toy

Mine has the same symptoms.... Hasn't been used a lot and has had a lot of work on it, and on the run home from the garage temperature gauge went through the roof but the fans didn't kick in.

I have had problems with the matrix which I'm in the process of replacing but I did think I was into head gasket problems, water pumps etc... But I think I'll try changing the sensor first...

Craig

I got a replacement unit from Peugeot just to be on the safe side!