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Overheating & part number question
#21
Hi Griff what I mean to say is that ( given that the engine fan " switch " has been tested and found good )

The switching on of the in cab heater making the temperature of the engine return back to a more normal level would indicate that the main radiator isn't working as it should. The use of the cab heater should have no obvious influence on engine cooling in any normal circumstance.
Often when the main radiator is getting old and less efficient at cooling the engine then the in cab heater often gives the impression of working really well and puts out a load of heat as the engine coolant is being cooled by the cab heater rather than the main radiator.
To illustrate, when I last replaced a radiator the change in the heat output of the cab heater was so dramatically less (the main radiator was back to working normally ) that I thought the heater wasn't working and needed bleeding ! All in fact was " ok ".

Geoff.
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#22
(04-01-2013, 08:49 PM)geoff Wrote:  Hi Griff what I mean to say is that ( given that the engine fan " switch " has been tested and found good )

The switching on of the in cab heater making the temperature of the engine return back to a more normal level would indicate that the main radiator isn't working as it should. The use of the cab heater should have no obvious influence on engine cooling in any normal circumstance.
Often when the main radiator is getting old and less efficient at cooling the engine then the in cab heater often gives the impression of working really well and puts out a load of heat as the engine coolant is being cooled by the cab heater rather than the main radiator.
To illustrate, when I last replaced a radiator the change in the heat output of the cab heater was so dramatically less (the main radiator was back to working normally ) that I thought the heater wasn't working and needed bleeding ! All in fact was " ok ".

Geoff.

Hi Geoff,
Yes that does make sense. The funny thing is that the temp gauge goes straight from normal halfway position to red. I would have expected it to climb up smoothly over a period of time even if quite quickly.
Looks like a new rad then!
Many thanks,
Griff :wave:
Landmark
Ex 1.4 Berlingo Multispace
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#23
Sounds like an electrical problem to me. So if the wiring/connectors are OK I would fit a new sensor (think they are about a tenner) before I did a radiator change.

Tony
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#24
The temperature sender has already been replaced

[/quote]
The funny thing is that the temp gauge goes straight from normal halfway position to red. I would have expected it to climb up smoothly over a period of time even if quite quickly.
[/quote]

This piece of information ^^^ could add a new perspective to things ?
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#25
(05-01-2013, 02:51 PM)tc_1 Wrote:  Sounds like an electrical problem to me. So if the wiring/connectors are OK I would fit a new sensor (think they are about a tenner) before I did a radiator change.

Tony
Hi Tony,
Is there a way of testing the sensor in situ? I do have a digital multimeter. Do you happen to know what the cold & hot readings should be?
Cheers,
Griff
Landmark
Ex 1.4 Berlingo Multispace
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#26
Would it be a good idea to test the water temp independently to see if it is giving a true reading? If it isnt and the coolant is at a normal level when the temp guage goes to red, that would definitely imply an electrical fault, no? Like wise if it is possible run new temporary cables from the sender to the BSI, if there is a break in one of the originals inside the casing that is sometimes losing contact (Rustscrat has said I think that if the contact is broken or removed it has the effect you are describing?) that would eliminate or confirm that option.
Just thinking around it. Confusedcratch:
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#27
The issue with testing the unit is if the fault is intermittent the chances are it will test OK. Which is why replacing the unit can be the easiest option.

Tony
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#28
(05-01-2013, 10:58 PM)tc_1 Wrote:  The issue with testing the unit is if the fault is intermittent the chances are it will test OK. Which is why replacing the unit can be the easiest option.

Tony

Fair coment. Also following Rustscrat's advice on disconecting sensor plug, the fans worked (even on a cold engine) so I'm assuming the loom wiring is ok.
Regards,
Griff
Landmark
Ex 1.4 Berlingo Multispace
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#29
Hi Folks,
Due to another fault I had the vehicle put on the Citroen diagnostics and it showed up a fault on the "High speed fan". I was not aware that there were 2 fan speeds. So when the fans were running ok (apparently on low speed) I thought everything was ok. It appears there was a break in the wiring on this high speed cuircuit and this caused it to overheat when hot and satationary!
We live and learn,
Griff
Landmark
Ex 1.4 Berlingo Multispace
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#30
hi just quick note am trying to find the fan switch sensor as the fans are not kicking in I know as when crawling in slow traffic its creeping in temp I have sensor to fit if its this but upon looking at one of the fans I got 2 one of them sticking when I try to spin it other ok its free would it be that or senor I need inlimante one of them before I go down the road for set of fans sods law it be the fans there something clicking coming from the fuse box on right of engine
thanks kev
its a citroen belingo 1.9 diesel 2000
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