>> If the thermostat is working why do you need to blank the radiator?
In the case of the Astra-G, one radiator fitted all engines. Some of the engines were overcooled because of it. Only way to get any heat was to block off the lower part of the radiator in winter - even with a correctly operating thermostat. If the thermostat was goosed though it made matters even worse. To change the thermostat on some engines involved removing the cambelt. Not cheap, and a right PITA. The lino trick was far simpler and cheaper.
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