You should never remove the thermostat from the engine they they are ther for a reason to regulate the water flow arond the engine and keeps it at the right temperature your heaters wont work properly either it also effects the emissions on the engine and may fail mot if you think the thermo stat is faulty buy a new one drin the cooling sysem and dont forget anti freeze and also buy a new thermo switch thats why the fan is not running.
tom, November 2009