Quote:
Originally Posted by bilsan330
Thanks where would I get the sensor from and is it easy to fit..What would I ask for if i ordered one.
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The important clue is the temperature gauge falling to the Off position. That's from the loss of signal from the sensor. Because it doesn't 'know' the engine temperature, the ECU responds by tripping on emergency high speed cooling.
In nine cases out of ten, the push-on connector needs cleaning. They become coated in oily grit which gets vibrated into the plug. Get a can of electrical contact spray (eBay, Halfords) and give the connector plug and the sensor pins a good sousing. Check that the plug feels nice and solid when pushed home. If that doesn't fix it, trace the wiring back from the plug to the main harness. There may be an intermittant failure in the wiring from vibration fatigue. Some owners have had to tease apart the harness a few inches to get to sound wiring. However, I'd say that's much less common than connector/plug issues. You'll notice that the fan will run at high speed if the sensor plug is disconnected and you start the engine. Reconnect the sensor and it should be back to normal.
As to the low speed resistor for the radiator fan, check whether the one fitted is the original thin(15mm acress, 10cm long) aluminium one or the much larger gold coloured uprated alternative. You need the gold one. It's located behind the fan blades at the 2 o'clock position. You have to look through the front grill and maybe require a good torch to see it. Use a thin stick to turn the fan blades if necesssary. An uprated 'gold' resistor can be obtained from electronics outlets like Farnell, RS Components, or from forum traders and from eBay. Fitting information is easily located. It requires you to remove the front bumper panel. Again, this is well documented with HowTos on the forums and YouTube videos.
In the unlikely event that the sensor itself is faulty, you can get these from Rimmer Brothers and most of the major spares outlets online. The part is called the coolant temperature sensor. The MGR part number is
MEK000030 and there are many equivalent alternatives so prices vary widely.
Click this.
To fit one, you have to drain some coolant off and collect it if you want to reuse it. The sensor screws into the cylinder head at the right hand end as you look at it. Refer photo above.
Top up with the collected or fresh coolant and bleed as necessary. You should also buy a
Haynes Manual
TC