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check the heater rheostat under the scuttle pannel(wiper area)they burn out
There is a solution to this on the vauxhall owners network website.
depending on the year if its astra f 91-98 its underneath the wiper skuttle panel and if its astra g 98-04 its behind the glove box (couple of screws) then its located behind a rectangular cover on the side of the heater box held on by two 5.5mm screws
19 and a 20 inch on the front. 16 inch for the rear.
The wiper relay is located in the fuse box (driver side foot well)
bacon
Remove the plastic caps on the Astra wiper arm. There is a nut under the cap, remove it. The arm will now slide off of the splined shaft.
The size of the wear wiper blade on a Vauxhall Corsa Comfort depends on the year. On a 2001, the size is 16 inches.
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18" blades.