I had a Zafira A until recently, much the same.
Thermostat lasts two years before getting "tired". Warmth is restored by changing it.
The offical part is expensive as they only sell the housing, thermostat and temperature sender as a complete unit. The usual suspects will happily sell you just the thermostat part and that's all I used to change.
Regardless of the rad size, if the engine is overcooled the thermostat is not doing its job.
Last edited by: TeeCee on Wed 27 Mar 13 at 13:59
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