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Little Megger
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49 Posts
Discussion Starter · #1 ·
Hi guys

Here is the problem.
Before two weeks I've noticed that the engine temp was raising too slow. I went to the ford's local dealer exlainig the broblem, they said ''ok we will change the thermostat''.
They changed the thermostat but after that I noticed that when the engine temp comes to normal level the radiator fan allways works in hi-speed and never stops even when I drive with 120 km/h with ambient temp 15 degrees.
[color:red]Notice that the instument cluster temp indicator is allways in normal level.[/color]
Whent I went back to the dealer they plug it with the computer. Conclusion:No idea what is it.
Engine temp they said is ok but they cannot uderstand what is the problem. Now they are going to change the thermostat again just in case of the new problematic thermostat.

Any ideas?
Where are located the sensors who send signal to the radiator fan?
Do you think that the new thermostat may be damaged?

Many thanks :L

Mk3 Mondeo 1.8lx petrol (2004 facelift)
 

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MEG Corporal
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674 Posts
edit: You've got a mk3, my information may be incorrect.

It sounds like the ecu coolant sensor is faulty, it sits on top of the thermostat and should be quite east to change There is a seperate sensor for the gauge in the dash board. This is located on the bottom of the thermostat which is more difficult to change. If you can replace both.
 

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MEG Corporal
Joined
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1,112 Posts
Haynes indicates that there's only one temp sensor on the nearside (UK) of the cylinder head, it sends a signal to the ECU. I guess that the ECU then sends a signal to the gauge.

You can check the coolant temp with the dashboard diagnostic thing (see paul young's thread)
 

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Little Megger
Joined
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49 Posts
Discussion Starter · #5 ·
They changed the thermostat again and it works the same.
The temp sensor which is located on the thermostat gives signal to the ECU for high speed as it was in the first case .
Water pump works ok.
They are afraid mulfunction of the radiator so they said that they are going to change it now. :(
I" pick the car this afternoon if I am lucky. We"ll see...
 

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MEG Corporal
Joined
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1,112 Posts
ktsortanidis said:
They changed the thermostat again and it works the same.
The temp sensor which is located on the thermostat gives signal to the ECU for high speed as it was in the first case .
Water pump works ok.
They are afraid mulfunction of the radiator so they said that they are going to change it now. :(
I" pick the car this afternoon if I am lucky. We"ll see...
I've not seen the thermostat cover on my Mk3, I'm building up to it ;) Are you sure there is a sensor fitted to the thermostat cover? There should be a connection for the electrical operation of the thermostat when instructed by the ECU (heavy load). Perhaps you could take a photo of the old thermostat cover and post it here?

A coolant fan will operate when the aircon is switched on, irrespective of coolant temp.
 

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Premium Member
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19,696 Posts
dont know if its the same kindof problem but will put it into the mix anyway.

read a few posts in the past about a fan problem ( cant remember if it was always on or never on though ) the problem turned out to be a resister/sensor pack on the radiator housing was faulty.

might not be any use at all but its another thing to look at.
 

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Little Megger
Joined
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49 Posts
Discussion Starter · #8 ·
They said to me that the thermostat carries the temp sensor which gives to the ECU the signal for temp level.
This was answered when I asked them if they have checked of mulfunction of this sensor.
A photo is very difficult to me to be taken due to the fact that the car is at the dealer's workshop.

Thanks for the reply

Mk3 Mondeo 1.8lx petrol (2004 facelift)
 

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Little Megger
Joined
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49 Posts
Discussion Starter · #9 ·
To your information the instalation of the new radiator had no effect at all. The fan works again in high speed when the temp comes to the normal level (info of the instument cluster).
As far as the radiator sensor concern I'll mention it to the supervisor of the dealer's workshop.

Thanks

Mk3 Mondeo 1.8lx petrol (2004 facelift)
 

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Little Megger
Joined
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49 Posts
Discussion Starter · #10 ·
FOrd dealer workshop wrote history yesterday.
You wont believe it. They were instaling thermostat at 74 degrees instead of 70 degrees.

They instaled the correct thermostat and the problem dissapeared. Oaou... Everything seems to be ok.

Mk3 Mondeo 1.8lx petrol (2004 facelift)
 

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Little Megger
Joined
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49 Posts
Discussion Starter · #11 ·
Ford dealer workshop wrote history yesterday.

You wont believe it. They were instaling thermostat at 74 degrees instead of 70 degrees.

They instaled the correct thermostat and the problem dissapeared. Oaou... Everything seems to be ok.

I leace the comments to you...

Mk3 Mondeo 1.8lx petrol (2004 facelift)
 

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Little Megger
Joined
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49 Posts
Discussion Starter · #12 ·
Ford dealer workshop wrote history yesterday.

You wont believe it. They were instaling thermostat at 74 degrees instead of 70 degrees.

They instaled the correct thermostat and the problem dissapeared. Oaou... Everything seems to be ok.

Feel free to make any comments...

Mk3 Mondeo 1.8lx petrol (2004 facelift)
 
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