960 coolant level sensor

[940volvoman]

Some time ago I upgraded the coolant reservoir on my 940 Celebration estate to include a level sensor from a 960. It has worked perfectly until now, alerting me on a couple of occasions that the coolant level was low.

However, now the warning light is coming on even though the coolant level remains high, so I am assuming that the sensor is faulty.

Are these a replaceable item?There are some listed on ebay but I cant see on the reservoir how it comes apart.

Any ideas please?

Shaun

[gpl1968]

Yes the reed switch that slots in the base of the coolant tank just pulls out and there should be a connector plug nearby. Could be that the magnetic float in the tank has got stuck. Remove the tank and give it a good shake. You should be able to feel/hear the float moving.

The reed switch is shown in the attached pdf (part #38).

[940volvoman]

Thanks for that,Gavin.I did try shaking the tank a while back,but it's got stuck again.

I'll take a look at part 38.Thanks again

Shaun

[940volvoman]

I still have the problem with the sensor getting stuck.

Is there a way of freeing this? Is is a serviceable item?

I'm guessing that its the sensor because the circuit works, but the light comes on without there being a drop in coolant during the summer months.....I'm also guessing that the magnet could be going rusty???

Thanks

Shaun

[J liddy]

Yes I put one on my 1995 D24 900 as my tempreture gauge stopped working years ago .I've seen the sensors for sale ebay etc. So so not a big job to replace t
hem get one and go from there you will need some joint fittings fairly simple job

[940volvoman]

Thanks for that, J Liddy.

My problem is this. How do I determine whether the magnet inside the reservoir is stuck or whether the sensor is faulty?

The lamp works, so I am assuming that the magnet is getting stuck.

Is there a way to free this permanently or is it a case of renewing the reservoir?


Thanks

[Rversteeg]

The sensor/switch clicks in from the bottom of the tank, so I assume you should be able to get it out the same way. If you move a magent along the sensor it should switch the warning lamp on and off. If it doesn't, replace the sensor/switch

[940volvoman]

That's a great tip,there Rveersteeg. Its rather obvious, too when you point it out like that....

[J liddy]

It sounds odd magnet getting stuck if you turn resovoir upside down magnet moves freely don't think it can get stuck .but not 100 %sure

[940volvoman]

Thanks,J Liddy.

It was just a thought