P38 Top hose and Gearbox over heat sensor

Top hose is perished so can I just swap it and top up or should I bleed it ? if so How?
I get Gearbox overheat fault as soon as I start up so I suspect the sensor, some journeys it never goes off?
Had a look and I think I can see the wires but cant see the sensor on the little rad?
Any idea of the resistance of a new sensor so I can just short it out?

Are you talking '38 Mr winch?
Does it have a fan also?
If so, look behind your passenger head light, there is a red and a blue plug. One for the fan and one for the sensor. You can follow them down from there to your rad. It may be fixed to the outside frame of the rad close to the bumper. In fact if you have the fan there'll be two.

Mark Piercy said:

Are you talking '38 Mr winch?
Does it have a fan also?
If so, look behind your passenger head light, there is a red and a blue plug. One for the fan and one for the sensor. You can follow them down from there to your rad. It may be fixed to the outside frame of the rad close to the bumper. In fact if you have the fan there'll be two.

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He did post P38 Mark but not engine type. . Are we to assume auto?

Sorry
Its a very early P38 2.5 Diesel auto
no fan on the cooler

You don't need to read everything. Yeh know..
Try disconnecting the sensor. It may be just a thermal switch?
Check for resistance or a short.

I think I did? I think its the plug on the side of the Rad mount between the Power steering res.
Usually temp sensor controllers look for a resistance so if it goes open circuit it knows the sensor is faulty

Are there any leaks underneath and is your oil level OK ?

Yes all the oil is in the correct place, drives fine Prindle flashes but has done for the last 3 years

winchman said:

I think I did? I think its the plug on the side of the Rad mount between the Power steering res.
Usually temp sensor controllers look for a resistance so if it goes open circuit it knows the sensor is faulty

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Something new, so it's a variable sensor.

Prindle?
Like..
You have one of these on your dash... Is it an autobiography model?

I would assume the controller looks for a certain temp range from memory its a bit better than just a Thermal strip like a Kettle
But I also read it just switches it to earth but I dont think this is the case as it would stop the alarm if the wire was cut?

Mark Piercy said:

Prindle?
Like.. View attachment 223298
You have one of these on your dash... Is it an autobiography model?

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The Gear sector thingy

If cut accidently? Try and unplug it, if it continues its a resistance type if it stops it may just be a thermal switch

winchman said:

The Gear sector thingy

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Did you really want a prindle on your dash? Your not disappointed are you

Mark Piercy said:

Did you really want a prindle on your dash? Your not disappointed are you

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I will never be disappointed its the best £1000 car I have ever had

Niiiice. Boats are nice but the '38 is much better. We can off-road in confort.

Mark Piercy said:

Niiiice. Boats are nice but the '38 is much better. We can off-road in confort.

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I thought the best day of boat ownership was the day you sold it???

A bit like car ownership sometimes

Mark Piercy said:

Prindle?
Like.. View attachment 223298
You have one of these on your dash... Is it an autobiography model?

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Heard of PRNDL for park, reverse, neutral, drive lever?

Grrrrrr said:

Heard of PRNDL for park, reverse, neutral, drive lever?

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Nope, it's the boat...