Changed coolant earlier and when I ran car up to "what I have to guess" right temp as my temp gauge not working, fans don't kick in. With little bit of throttle to make sure it's hot enough fans just ent kicking in. Do they take longer then other engines to kick in or am I being stupid here. Plugged green plugs in and fans do come on so that's not the problem ? Could it be thermostat gone ? Bit worried bout using the car as I don't want a full meltdown here