Totaly stuck with my tempname() Help?

Hello,

This is possibly the most easy'est question I have ever asked yet I cannot solve it -_-

Workspace.DetectFans:86: attempt to call global 'tempname' (a nil value) is the error message. I just want to know why it isn't working. If I remove the function tempname() it will work fine. Help? It is suppost to change the module name to the currentTemp.

Fan1Value=game.Workspace.FanValues.Fan1Value
Fan2Value=game.Workspace.FanValues.Fan2Value
Fan3Value=game.Workspace.FanValues.Fan3Value
Fan4Value=game.Workspace.FanValues.Fan4Value
Fan5Value=game.Workspace.FanValues.Fan5Value
Temperature=game.Workspace.TemperatureValue
currentTemp = game.Workspace.TemperatureValue.Value

function Fan1On()
	if Fan1Value.Value == true then
	wait(3)
	game.Workspace.TemperatureValue.Value = game.Workspace.TemperatureValue.Value  -3
end

function Fan2On()
		if Fan2Value.Value == true then
	wait(3)
	game.Workspace.TemperatureValue.Value = game.Workspace.TemperatureValue.Value  -3
end

function Fan3On()
		if Fan3Value.Value == true then
	wait(3)
	game.Workspace.TemperatureValue.Value = game.Workspace.TemperatureValue.Value  -3
end

function Fan4On()
		if Fan4Value.Value == true then
	wait(3)
	game.Workspace.TemperatureValue.Value = game.Workspace.TemperatureValue.Value  -3
end

function Fan5On()
		if Fan5Value.Value == true then
	wait(3)
	game.Workspace.TemperatureValue.Value = game.Workspace.TemperatureValue.Value  -3
		end
		
function Fan1Off()
	if Fan1Value.Value == false then
		game.Workspace.TemperatureValue.Value = game.Workspace.TemperatureValue.Value  +3
	wait(3)
end

function Fan2Off()
		if Fan2Value.Value == false then
	wait(3)
	game.Workspace.TemperatureValue.Value = game.Workspace.TemperatureValue.Value  +3
end

function Fan3Off()
		if Fan3Value.Value == false then
	wait(3)
	game.Workspace.TemperatureValue.Value = game.Workspace.TemperatureValue.Value  +3
end

function Fan4Off()
		if Fan4Value.Value == false then
	wait(3)
	game.Workspace.TemperatureValue.Value = game.Workspace.TemperatureValue.Value  +3
end

function Fan5Off()
		if Fan5Value.Value == false then
	wait(3)
	game.Workspace.TemperatureValue.Value = game.Workspace.TemperatureValue.Value  +3
		end
		
function tempname()
	wait()
	game.Workspace.wait.Name = ""..currentTemp.." C"
	end
end
end
end
end
end
end
end
end
end
end

while true do
	wait(2)
	tempname()
	Fan1On()
	Fan2On()
	Fan3On()
	Fan4On()
	Fan5On()
	Fan1Off()
	Fan2Off()
	Fan3Off()
	Fan4Off()
	Fan5Off()
end