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How long does the coolant take to warm up? What are ambient temperatures like at the moment?
The VW PD diesel engines are very slow to warm up, so the grill block provides thermal benefits and not just aero. I'd check the thermostat too if you're not reading dead-centre on the coolant temp, VW thermostats are easy enough to replace but known to go.
Have you got a full undertray under the engine bay? If not you may be able to get one off a Bluemotion model and there could be minimal work required to get it to fit.
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