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 Posted: Wed Nov 07, 2012 4:03 pm |
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Joined: Sep 06, 2012
Posts: 5
Trade Rating: 0
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Hi,
Wonder if anyone can help with this problem:
My 12 year old Peugeot 206 has got a very intermittent overheat problem. Whenever I take it to the garage, they can't get the fault to reproduce. I drive the thing every day and it probably happens once or twice a week, always in traffic.
I have recorded what I see and have uploaded it:
www.youtube.com/watch?...Cbnokn_CF4
Looks like an electrical or sensor problem as I can't believe the engine actually gets so hot that quickly. Always happens in traffic. Temperature creeps up to 95C, it hovers there for a while then shoots up to maximum (0:38). Putting the AC fan on (0:45), I sometimes feel a little 'kick' in the electrics and the problem is gone.
Can anyone diagnose this from the video?
My apologies for the 'soundtrack'!
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Last edited by cam1210 on Wed Nov 07, 2012 5:23 pm; edited 1 time in total
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Posted: Wed Nov 07, 2012 4:22 pm |
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Joined: Sep 07, 2012
Posts: 46
Trade Rating: 0
Location: Devon
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I can't help with the problem, but your video doesn't exist apparently
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Posted: Wed Nov 07, 2012 5:24 pm |
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Joined: Sep 06, 2012
Posts: 5
Trade Rating: 0
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Thanks for pointing that out. Think I've fixed the link now!
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Posted: Wed Nov 07, 2012 5:27 pm |
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Joined: Feb 08, 2010
Posts: 10151
Trade Rating: +12
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check the coolant sensor, check the thermostat, check the fan relay and fan, check coolant level and check if there is air-lock in the coolant system.
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Posted: Wed Nov 07, 2012 5:29 pm |
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Joined: Jan 21, 2012
Posts: 345
Trade Rating: +2
Location: Earl Shilton UK
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I would say faulty sensor, for it to jump like that.
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Posted: Wed Nov 07, 2012 5:38 pm |
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Joined: Sep 06, 2012
Posts: 5
Trade Rating: 0
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Posted: Thu Nov 08, 2012 6:00 am |
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Joined: Aug 19, 2011
Posts: 619
Trade Rating: +2
Location: Wiltshire
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Does the fan kick in or not? That would be useful information. If it does, then thermostat, or temp sensor.. If fan doesn't work, change both the relays as they are prone to corrosion.
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Posted: Thu Nov 08, 2012 9:43 am |
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Joined: Sep 06, 2012
Posts: 5
Trade Rating: 0
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Thanks all. I think the fan is kicking in sometimes, but not every time it should.
I can't believe the engine is actually properly overheating like that.
Best explanation I have had so far is that the fan controller is faulty. Car is getting hot (>95C), sensor works but the fan controller is at fault...the car then puts the engine temp indication through the roof so that you stop the car to cool it.
I agree...relay could be the problem too.
Putting the cabin heater on full blast sometimes kick-starts the radiator fan into life.
Does this sound reasonable?
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Posted: Thu Nov 08, 2012 10:53 am |
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Joined: Jun 28, 2011
Posts: 167
Trade Rating: 0
Location: York
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This probably wont help but mine does the exact same thing except it makes a very loud fan noise at the same time and again only happens when the car is stood still or in traffic for a couple of mins. i posted this problem on here before but never got a definite answer. does yours make a loud noise too???
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Posted: Thu Nov 08, 2012 7:40 pm |
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Joined: Apr 19, 2012
Posts: 529
Trade Rating: 0
Location: darlington
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Do you have any anti-freeze/coolant in the water system or is it mostly water?adding anti-freeze should lower the temperature a bit.And whacking the heater on full should help it when it gets too hot.
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Posted: Fri Nov 09, 2012 6:15 am |
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Joined: Oct 05, 2012
Posts: 23
Trade Rating: 0
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My car used to fling into the red when I didn't have a thermostat in it. The temp gauage would stay very low and after about 30 minutes of driving, I think the ECU decides that there is a problem and that the car should not be so "cold" and flings it into the red to alert the driver. The car is not aware if it is overheating or not if the temp sensors etc are not marrying up.
I replaced (or actually added one) and the problem went away.
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Posted: Sat Nov 10, 2012 6:20 am |
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Joined: Sep 06, 2012
Posts: 5
Trade Rating: 0
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Yes, now that I understand the car purposely whacks the temperature through the roof as an alert to get you to stop I understand my problem a bit better.
I think my fan is sometimes not coming on, and I'm going to look at the relays and fan control.
Can anyone tell me - does putting the internal cabin heater fan on affect the main radiator fan? Are the two linked?
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Posted: Sat Nov 10, 2012 7:10 am |
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Joined: Feb 07, 2010
Posts: 2949
Trade Rating: +6
Location: Athens, Greece
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NO.
There is an additional temp sensor which is actualy a switch (on/off) on the block, and when that 'trips' (120 C) it shorts the temp gauge sensor line to tell the cluster it's overheating and light the STOP on the dash.
When this happens (jump of pointer like that) it means the water in the block is not circulating (therefore not getting to the ECU/gauge sensor) and is usually caused by either:
1) Air in the coolant system
2) Faulty said temp switch
3) Water pump going or gone
You can see the switch mounted quite low on the side of the engine block, on the right looking from the front.
Shιte tune BTW. 
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