Engine Temp Needle Down, Engine Running Cool?

[Guest MATT]

Hi all, got a problem with the engine temp needle.

 

You will be going along, engine temp at 90C, then it will just drop to the 50C position (as if its switched off) then it could do any of the following...

 

Spring back to 90C - and stay there a while, then goes back down.

Go up to any other temp, ie, 60, 70, 80, stay there, move between them, or go back Down to 50.

Stay on 50C for a long period.

 

Or it can just move between 90C and 70C over and over.

 

It does it with or without aircon on.

 

The problem got worse in spain/france, but has continued in Briton.

 

Any ideas folks?

 

MATT

[Steveenduro]

Almost certainly the engine coolant temp. sensor.

Exactly the same happened to mine. You may also occasionally get high revs on start-up when engine is luke warm as the sender will sometimes tell ecu that engine is cold when it's not.

Look for threads on changing. Quite easy to do, especially if you have ever worked as a gynacologist.

[Guest MATT jr]

You may also occasionally get high revs on start-up when engine is luke warm as the sender will sometimes tell ecu that engine is cold when it's not.

 

sounds exactly right - as one day it reved up when i started it - just thought of it as a "one off"

 

Thanks,

 

MJR & MATT

[anadin]

You may also occasionally get high revs on start-up when engine is luke warm as the sender will sometimes tell ecu that engine is cold when it's not.

 

sounds exactly right - as one day it reved up when i started it - just thought of it as a "one off"

 

Thanks,

 

MJR & MATT

 

have a good play with the sensor wiring first and check all the connections in that area , you never know :)

[Guest MATT jr]

thanks for info, we will have a play today if the weather holds up.

 

thanks again,

 

MJR & MATT

[gazza007]

same here

 

Sensor

 

wow doesn't time fly

[Guest MATT jr]

after reading all the info, deffo seems like engine temp sensor - only problem is its raining!

 

i read somewhere there

[peasey]

after reading all the info, deffo seems like engine temp sensor - only problem is its raining!

 

i read somewhere there

[Guest MATT jr]

thanks for the info - is it the same brand/sensor?

 

regarding removing the temp sensor,

do i need to drain the coolent before removing it?

anyone got a photo of the sensor in the engine bay? - iv seen seat kids pic from the tis, but the tis has no ino on how to remove the sensor.

 

MJR

[anadin]

thanks for the info - is it the same brand/sensor?

 

regarding removing the temp sensor,

do i need to drain the coolent before removing it?

anyone got a photo of the sensor in the engine bay? - iv seen seat kids pic from the tis, but the tis has no ino on how to remove the sensor.

 

MJR

 

if you havn't already done it , yes you need to partially drain the sytem, on the mk1 dsl, its located on the coolant outlet pipe near the head right hand side , has a circlip through the whole assembly holding it in , prise this clip with screwdriver or pull it with pliers, dont drop it ! :lol: :27: , ease out the switch :lol:

[Guest MATT jr]

ok - i will study the situation today (assuming weather holds up) and do it tomorrow (ford parts closed today, open tomorrow)

 

thanks all

 

MJR

[Guest MATT jr]

....had a look today, and i got a problem.

 

1) theres a pipe, that im guessing comes from the turbo to the engine, i need to remove part of this pipe, in order to gain good access to what i think is the sensor below.

 

i can remove the circlips, but the rubber pipe seems impossible to pull off the solid plastic pipe.

 

anyone got any tips?

 

thanks,

 

MJR

[NikpV]

anyone got a photo of the sensor in the engine bay?

 

 

any help?

[Guest MATT jr]

lol - thanks nikpv - but i meant a real, actual photo of the sensor.

 

my problem is that pipe tho, i was thinking of heating the rubber part to make it more flexible and expand, so it will come off easier?

 

MJR

[anadin]

:lol: muscles ;) try lifting the lip with small screwdriver spray inside with wd40 you should get the straw in ,