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[Drewomega]

Hi fellow oofers! I have not contributed on this forum for quite some time. However, since the temps up here have taken a dramatic downward spiral ie: -6c last night and double figures forecast over this weekend!
This morning I had to scrape windows and started the old girl up, and switched on both demist and heated rear windscreen. There was a slight noise when I turned on the HRW and it slightly made a difference to the engine revs but would not stay on.
However, this evening when the temps had gone up slightly the problem did not appear!
Any idea chaps?

Cheers

[Kevin Wood]

I guess it's possible that the climate panel disables the rear screen if the battery volts drop too low. Maybe that was it and the battery has now recovered?

[Drewomega]

Thanks Kevin! The battery is only 3 months old, a Bosch, so good quality. Is there a relay in the boot area as the noise seemed to come from that area? Of course with the temps up to 12c the demister switches on without any problems.