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Old 01-06-18, 07:25 AM   #1
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Default Water-Temp rises 407/2006

Hi all,
On my Peugeot 407 SW of 2006, 2.2 with 220 000 km I suddenly get a warning that the temperature rises and then it says STOP! When I stop and wait about 5 min I can go on, but soon the temp rises again.
I did
- change the watertempsensor
- change the fan, witch did not work on middlespeed.
- vacumfilled the water under high pressure and tested that the pressure still was the same avter 12 hours.

After this it worked fine a couple of weeks, but then return to the fault.

First time it happened (Mars this year) the temp in the car was cold and after some stops, the heating suddenly came back again and I could drive some days.

My thoughts was that the waterpump could be the problem. It was changed at 100 000 km.

Grateful for all helps!
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Old 01-06-18, 07:21 PM   #2
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My first thoughts would be to replace the thermostat.
Make sure you bleed the cooling system correctly afterwards.
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Old 01-06-18, 07:41 PM   #3
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I thougt of this and talked with my mecanicer. He said that if the termostat was faulty, the temp would go down, not up. It opens if there is an error and then the cold water goes thru all the time. So there must be something else.
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Old 01-06-18, 07:55 PM   #4
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Your "mechanic" is wrong.
The thermostat is normally closed.
If it fails then it will not open causing over heating.
I'd suggest you use another garage.

Last edited by ashdav; 01-06-18 at 07:58 PM.
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Old 01-06-18, 08:05 PM   #5
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OK, I hope you are right.
I will send you a report after having fixed it.

My first garage said it was the head gasket, So I changed garage and hope for
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Old 01-06-18, 08:30 PM   #6
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Failed HG would use coolant wouldn't it?
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Old 03-06-18, 07:44 AM   #7
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I do not understand what you mean with
- HG
- use coolant.
Could you please explain for me. I am a Swede and am not familiar with English terms.
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Old 03-06-18, 12:49 PM   #8
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He means if the cylinder head gasket has failed, you would see the level of coolant (water plus anti-freeze) would drop in the reservoir. I presume you or your mechanic checked that?

As for the thermostat, it can fail in the open or closed position, or anywhere between. It can sometimes unstick, so it looks like the problem has gone away, and then it can start sticking again.
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Last edited by IanML; 03-06-18 at 12:54 PM.
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Old 04-06-18, 03:57 AM   #9
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Thanks for that explanation!

We have tested the pressure of the coolant over an night with. The level did not change so we excuded that reason.
After that we change the waterfan, wich did not work on medium speed. Then we thought that the problem was solved. So, after a couple of days, the problem was there again.
Now I will go back and change the thermostat.
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Old 04-06-18, 06:58 PM   #10
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Quote:
Originally Posted by IanML View Post
As for the thermostat, it can fail in the open or closed position, or anywhere between. It can sometimes unstick, so it looks like the problem has gone away, and then it can start sticking again.
As Ian says, the thermostat can stick in any position. I would certainly change it as a first option. And dont use a cheap chinese one!! Get a good make or preferably a genuine peugeot one.

And make sure you bleed the system thoroughly as any air in the system will cause issues somewhere down the line!
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