Not sure if it will fit or not, but I'd get the tank if it's less than £60 and fit it yourself.

Less than 1mm a year? Mine loses that a mile! :lol:

 

The same black sensor was used on all of the coolant tanks, irrespective of the different part numbers.

The sensor can be swapped, it's a push fit into the base of the tank.

 

The same black sensor was used on all of the coolant tanks, irrespective of the different part numbers.

The sensor can be swapped, it's a push fit into the base of the tank.

Cheers, Technozen - I won't let them unnecessarily replace the header tank then if the sensor is available on its own!

 

The sensor has a long "stalk" that protrudes into the tank, make sure this isn't flexed or bent as it will fracture the switch inside (it's contained within a glass envelope and is fragile).

 

Another one to remember, cheers

 

Can I replace the sensor myself? Does the cooling system have to be drained to get at it?

 

Yes, you can replace it yourself.

The system does not have to be drained. Remove the two bolts securing the tank and pull it slightly forward and up to release it, there will be enough movement in the hoses to turn the tank so that you can see the sensor on it's underside.

It might be easier to leave the wiring connected as the plug will give you more grip when pulling the sensor out.

 

OK - please forgive my lack of knowledge here - removing it the old one sounds all right, but what about wiring in the new one? Is it fairly obvious/simple?

 

Click the new sensor into position and plug in the wiring connector, then refit the tank.

 

OK, cheers!

 

Before changing the sensor, try marginally overfilling the header tank by 2-3 mm only - This fixed the problem on both our R45s.

 

I take the point, but I'm also sick of that light coming on every time the coolant drops a mm! I think the old sensor is a bit flaky.

And someone had a go at me when I said 9 times out of 10 a garage will rip you off charging for work that doesnt need doing.

Exactly! That's why I didn't wanted the header tank done as well, as there's nothing wrong with it!

 

Just to wrap this up - the coolant level sensor was replaced in the end with the result that the warning light is now off. Fingers crossed it stays off!

In case this helps anyone, it turns out that the part numbers for the coolant level sensor are different:

PCJ000050 for the Rover 45 and MG ZS

PCJ000040 (for Rover 25 and MG-ZR I think).

Cheers for all your help!