temperature warning light comes on, cooling fan not running.

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My Name: Hijjama

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Posts: 3
Joined: Mon Sep 14, 2020 6:59 pm
Model: C3 2002-2005, Original shape model
Year: 2005 (05)
Engine Size: 1.1
Fuel Type: Petrol
Mileage: 130000
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: LHD (Europe)

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Hi, it is good to be here. I am the owner of C3 1.1 2005 Citroen.
Recently, when it is hot outside, my temperature warning light comes on. Now I have antifreeze with water mix in bowl, I'm not loosing it. My fan is spinning when A/C is on. :shock: That same fan, when I turn of engine, doesn't cool of the same engine. What's going on?
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My Name: C3CAR

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Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
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Gearbox: Manual 5 speed
DPF: No
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Hijjama wrote: Mon Sep 14, 2020 7:52 pm Now I have antifreeze with water mix in bowl, I'm loosing it.

Hi


You are loosing coolant (water and antifreeze mix)?

You have a leak and there is not enough coolant in the system to keep the engine cool?

Fix the leak,

top up the system can not run the fan to cool the coolant - antifreeze and water mix that is used to cool the engine.


The fan does not keep the a/c cold or even keep the engine cold, it cools the coolant (water and antifreeze mix).
My Name: Hijjama

Member
Posts: 3
Joined: Mon Sep 14, 2020 6:59 pm
Model: C3 2002-2005, Original shape model
Year: 2005 (05)
Engine Size: 1.1
Fuel Type: Petrol
Mileage: 130000
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: LHD (Europe)

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My bad, I misspelled it. I meant to say not looseing it!
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My Name: C3driver52

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Model: C3 2002-2005, Original shape model
Year: 2003 (03)
Engine Size: 1.4 i
Fuel Type: Petrol
Mileage: 79984
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: TU3 (75 PS)
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Some of the petrols have 2 sensors.

Haynes says one is for the warning and the other tells the ECU to switch on the fan.

So you may have a faulty temperature sensor, but no the one that is for the 'over temperature warning'
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My Name: Ozvtr

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Model: C3 2002-2005, Original shape model
Year: 2003 (53)
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Hijjama wrote: Mon Sep 14, 2020 7:52 pm Recently, when it is hot outside, my temperature warning light comes on.
If the light is coming on when the day is hot then the probability is that there is something wrong with your cooling system. If it came on randomly then I would suspect a temp sensor. Usual suspects are the water pump, radiator and the thermostat. The thermostat can be inspected easily. The water pump requires removal of the timing belt and the radiator needs to be volume/flow tested. The thermostat can stick closed, the fins on the water pump can disintegrate and the radiator can gunk up with calcium.
Hijjama wrote: Mon Sep 14, 2020 7:52 pm That same fan, when I turn of engine, doesn't cool of the same engine. What's going on?
Hmm not sure what you mean there. Do you mean the fan doesn't run on when you turn the ignition off? It's not supposed to.
My Name: Hijjama

Member
Posts: 3
Joined: Mon Sep 14, 2020 6:59 pm
Model: C3 2002-2005, Original shape model
Year: 2005 (05)
Engine Size: 1.1
Fuel Type: Petrol
Mileage: 130000
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: LHD (Europe)

Post


Hmm not sure what you mean there. Do you mean the fan doesn't run on when you turn the ignition off? It's not supposed to.
Isnt fans job when motor gets hot to cool it,along with cooliant?
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My Name: Ozvtr

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Joined: Wed Jul 10, 2019 3:31 am
Model: C3 2002-2005, Original shape model
Year: 2003 (53)
Engine Size: 1.4 (8v)
Fuel Type: Petrol
Mileage: 80000
Trim Level: Other
Gearbox: Automatic PRND
DPF: No
LHD or RHD: RHD
Engine name: TU3 (75 PS)
Location: Brisbane, Australia.
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Hijjama wrote: Thu Sep 17, 2020 4:58 pm Isnt fans job when motor gets hot to cool it,along with cooliant?
Yes, but the fan will not run with the ignition OFF. Is that what you mean!? I don't understand what you mean by "turn of engine". Do you mean turn off engine, or what?
Your phraseology is unclear, if not confusing.

If there is a problem with the cooling system, like a blockage, then your coolant and cooling fan wont work successfully to cool the engine, irrespective of how good they are. I have explained some of the failure modes, above.

Your engine light is coming on when the day is hot, YES? The radiator fan runs when light comes on, YES? Therefor the cooling system is not coping. The engine light is ACTUALLY doing its job of warning you that there is a problem. If the light came on at RANDOM times, hot, cold, whatever, then it might be the coolant sensor, but it's not random, only when the day is hot. YES?
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