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                        and what does it do? (nissan micra probs again...)
                            
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                        It senses the coolant temperature and sends an appropriate signal to various control units..... 
 
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groups.msn.com/honestjohn - Pictures say a thousand words.....
                            
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                        It could be a level sensor.  What does the handbook say?
                            
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                        If he has a Micra problem it will be the coolant temp sensor.  There is a modified sensor wiring harness available for the Micra (cures starting probs).
                            
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