I once had the same trouble with a ZX.
The accidentally found fix was removing the 'switch' (not the correct name I
know ~ i forget the proper name for them) from the fuse/'switch' box, under
the bonnet IIRC.
On replacing it, everything worked fine afterwards.
Worth a try!
Had the same symptom some time ago - no radiator reconditioning
though. In my case the thermostat was stuck closed, so hot water from
the engine wasn't circulating out to the radiator and the fan kept
running with no effect. It's a pretty simple problem to fix, your
garage has probably already checked this.
Hope this helps,
Afterwards, it's like a dream. You can't remember - but it seems
to stay alive, inside your mind, and prey upon your leisure time.
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