Personally I'd refill the coolant, run the engine with the heaters on max heat and watch for steam from the vents and water running down from the back of the dash into the passenger footwell. Obviously don't let the engine overheat though.
There may be a better way to confirm it though, someone will be along shortly if there is lol.
Edit - Which fans won't come on? The engine fans? Were you in traffic when the temp shot up then? If that's the case it seems like theres more than one issue here lol.
There may be a better way to confirm it though, someone will be along shortly if there is lol.
Edit - Which fans won't come on? The engine fans? Were you in traffic when the temp shot up then? If that's the case it seems like theres more than one issue here lol.