As [MENTION=737]thatotherguy[/MENTION] mentioned rego authorities may need it in place for rego. It is a thermo/vac switch that (one of its functions) is to push the idle speed of the engine up if it starts getting too hot - drives the fan faster. Can't remember off the top of my head if it is ADR/emissions related or not as to if it actually needs to be there for rego. Best talk to the mob who does your inspections.
Regards,
Dave.
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