Demister rear window very slow...

It's November.

If all the 'bars' are working, you could check for good supply voltage to the HRW, and more importantly a good earth to the bodywork. - Especially on a hatchback where the hinge pins form the earth conductor. In this case a secondary earth from tailgate to chassis will no doubt improve things enormously.

Tim..

one bar is not working, could this be the cause? Can it be repaired?

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One single bar or wire not working is unlikely to affect the performance of the HRW greatly- and no it cant be repaired.

Low supply volts are the more likely culprit.

Tim..

What would be a normal voltage? Can I just measure it with a voltmeter?

Thanks

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Dont top post.

As close to 12v, preferably more (with engine running obviously) as you can get.

Dont forget to measure volt drop across the earth too.

Tim..

Usually. Halfords sell a silver loaded 'paint' for this purpose - quite expensive, though.

Same as the battery - a nominal 12 volts.

Yes.

I'd also extend the test leads with a bit of wire - anything will do - and check from the battery positive to the window positive. This will show any voltage drop in the circuit. Repeat between the battery negative and window ground terminal. Adding the two together should give no more than