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 Posted: Fri May 10, 2013 3:58 pm |
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Joined: Jul 09, 2012
Posts: 35
Trade Rating: 0
Location: Manchester
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Hi all,
Just having a small problem with my 206 at the moment.
I think i have an 82c thermostat in my engine however over the past few weeks the engine has been 90c and often hits almost 100 when under any sort of load or going up a hill however the temperature does come down slowly after the hill has passed.
It has never done this before and is normally under 90c. Is it safe at 100? I've checked the oil and water and they seem fine. I've also checked the engine fan and that comes on when I turn on the air con and I've seen it come on when the engine was idling and hit 90c or there abouts so that's working.
What are the chances of it being a broken thermostat? Is there anything else I should be checking?
Thanks for your help.
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Posted: Fri May 10, 2013 4:26 pm |
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Joined: Feb 07, 2010
Posts: 2720
Trade Rating: +6
Location: UK
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When, if ever was the coolant changed?
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Posted: Fri May 10, 2013 4:28 pm |
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Joined: May 16, 2011
Posts: 495
Trade Rating: +1
Location: huddersfield
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Could be Airlock
Pressure cap faulty
Faulty temperature sensor
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| 206 2ltr Hdi glx 53 plate | |
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Posted: Fri May 10, 2013 4:39 pm |
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Joined: Jul 09, 2012
Posts: 35
Trade Rating: 0
Location: Manchester
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I've had the car almost a year now. The people i bought it from *said* it had a service just before i got it in July 2012 however i don't know if they had changed the coolant.
It is due an MOT in june though and i was going to get a full service performed at the same time, do you think I should bump that up to now to see if that solves the problem?
How easy would it be to change the coolant myself? I dont have much experience and nothing above basic tools?
Why/how would it form an airlock if the system was closed? Again, is this something i could check myself or would the garage have to do that?
How would i check for pressure cap faults?
Is there a way to check the temperature sensor or do I just have to replace it and hope for the best?
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Posted: Sat May 11, 2013 2:20 am |
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Joined: Aug 01, 2011
Posts: 390
Trade Rating: 0
Location: Bath UK
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I think i have an 82c thermostat in my engine however over the past few weeks the engine has been 90c and often hits almost 100 when under any sort of load or going up a hill however the temperature does come down slowly after the hill has passed.
Are you sure your slow speed fan setting is working? You say the "fan is working" but I'm thinking are you just seeing/ hearing just the hi speed fan coming on in which case you will experience higher than normal gauge temps at times and the fan only working at max speed when the temp is higher. My fan slow speed setting come on around 90C. Quite common for the low speed fan resistor or relay contacts to fail as their stuck out the front but then it gets all the elements thrown at it.
Start the engine and listen very carefully or look for the fan starting up as temp goes above 90C.
Until you sort out the problem you could use your cabin heater to drag down the coolant temp which will do a similar job to the slow speed rad fan setting. Sounds like your hi speed fan setting is working though and so that will prevent overtemping
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Posted: Sat May 11, 2013 5:44 am |
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Joined: Jul 09, 2012
Posts: 35
Trade Rating: 0
Location: Manchester
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I think the low speed fan is working, I left the car idling the other day and as the temperature gauge hit 90c the fan in front of the radiator came on and it wasn't too loud so I assume it was the low speed fan? It also comes on at that speed when I put the air con on.
Would this mean that the low speed fan is working?
To use the cabin heater would I put the temperature to max heat to help drag the engine temperature down?
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Posted: Sat May 11, 2013 6:51 am |
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Joined: Aug 01, 2011
Posts: 390
Trade Rating: 0
Location: Bath UK
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I think the low speed fan is working, I left the car idling the other day and as the temperature gauge hit 90c the fan in front of the radiator came on and it wasn't too loud so I assume it was the low speed fan? It also comes on at that speed when I put the air con on.
Would this mean that the low speed fan is working?
Yes it would and that's good news. So now I would be thinking if the fan is working properly when the car is stationary, (and that's the worse of all with no natural air flow through the radiator) then why is the temp being allowed to creep up well above 90C when you're on the move? So the next time the gauge creeps up well above 90C then I'd check if the fan is working at that time. If it is then I'd be thinking about the coolant flow, so feel around, feel the radiator top hose, is it really hot? Feel the radiator ( watch your fingers as the fan might start at any time), is it hot at the top and coolish at the bottom indicating some sort of flow through the radiator.
To use the cabin heater would I put the temperature to max heat to help drag the engine temperature down?
Yes that's right, you're trying to draw heat out of the coolant system the same as the rad fan does
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Posted: Sat May 11, 2013 7:02 am |
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Joined: Feb 07, 2010
Posts: 2949
Trade Rating: +6
Location: Athens, Greece
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Sounds like coolant circuit / radiator would need to be flushed as a first step and take it from there.
Also, very often the heater matrix in the cabin is blocked preventing proper flow of coolant, irrespectively of heating setting.
Wax thermostat is 89 deg. C on the 206, that could be getting stuck too.
Proper refil and bleeding takes some care and effort ime.
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| 1.4i, 2001, 3-door, China Blue
Repair safely - Drive safely | |
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Posted: Sat May 11, 2013 7:15 am |
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Joined: Jul 09, 2012
Posts: 35
Trade Rating: 0
Location: Manchester
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If it is then I'd be thinking about the coolant flow, so feel around, feel the radiator top hose, is it really hot? Feel the radiator ( watch your fingers as the fan might start at any time), is it hot at the top and coolish at the bottom indicating some sort of flow through the radiator.
I've already done this based on other threads as well and the top hose was really hot and the bottom home wasnt as hot which is a good thing?
Also, very often the heater matrix in the cabin is blocked preventing proper flow of coolant, irrespectively of heating setting.
The temperature adjusts a lot based on what I set the temperature to, cold is still cold and hot is still very hot. Does this mean that the heater matrix is not blocked?
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Posted: Sat May 11, 2013 7:15 am |
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Joined: Aug 01, 2011
Posts: 390
Trade Rating: 0
Location: Bath UK
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I don't think this chap would have survived this last winter in Manchester if the heater matrix was blocked  A blocked heater matrix won't affect engine temperature as it's a parallel circuit
If you feel the top hose going to the radiator when the engine is coming up to temp from cold then if it suddenly gets really hot then the thermostat is opening and not stuck closed or open
The temperature adjusts a lot based on what I set the temperature to, cold is still cold and hot is still very hot. Does this mean that the heater matrix is not blocked?
That's right. It also indicates you have good flow at least through the cabin.
Have you had any loss of coolant issues? Boiling over? Sudden loss of fluid? Needing to top up often?
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Last edited by Deckchair5 on Sat May 11, 2013 7:21 am; edited 1 time in total
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Posted: Sat May 11, 2013 7:19 am |
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Joined: Jul 09, 2012
Posts: 35
Trade Rating: 0
Location: Manchester
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No definitively wouldn't have survived the last winter in Manchester without heaters!
I'm currently located in Bristol though so its slightly warmer (I keep telling myself)
I assume i would have to do the warm up test from engine cold?
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Posted: Sat May 11, 2013 7:24 am |
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Joined: Aug 01, 2011
Posts: 390
Trade Rating: 0
Location: Bath UK
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I assume i would have to do the warm up test from engine cold?
Yes that's right, you could sit in the cabin until it gets above 80C, then if you hold the top hose, once the engine gets near 90C, the hose should quickly get too uncomfortable to hold, that tells you the engine is up to temp and the thermostat is opening and dumping the hot coolant out to the radiator circuit for cooling
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Posted: Sat May 11, 2013 7:26 am |
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Joined: Feb 07, 2010
Posts: 2949
Trade Rating: +6
Location: Athens, Greece
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You're right it's parallel on this so wouldn't affect it anyway.
I would still flush the system though as a first step as it's always a good thing to get the crap out of there.
Water pump doing OK?
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| 1.4i, 2001, 3-door, China Blue
Repair safely - Drive safely | |
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Posted: Sat May 11, 2013 7:35 am |
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Joined: Jul 09, 2012
Posts: 35
Trade Rating: 0
Location: Manchester
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I'll check and see if it suddenly gets hot next time i take it out then.
Haven't got the tools to flush the system myself, how much do you reckon it would be at a garage?
I think the water pump is doing ok, how would i know if it wasnt?
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Posted: Sat May 11, 2013 7:39 am |
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Joined: Feb 07, 2010
Posts: 2949
Trade Rating: +6
Location: Athens, Greece
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Do you know when was it last changed (cambelt time)?
How many miles on the clock?
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| 1.4i, 2001, 3-door, China Blue
Repair safely - Drive safely | |
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