Charade 1.0 2004, only just warm enough

Forum: 

My 1.0 charade doesn't seem to be getting warm, it used to warm up great, but since I have had the exhaust inlet gasket replaced it just hasn't been the same. I had the thermostat replaced but its just the same. Don't get me wrong the heater isn't blowing cold air but it really isn't as hot as it used to be. Could anyone please through any light on the subject , or is anyone having the same problem.

Air lock?

Have you checked the coolant? Burped the system to see if you have an air lock? All the pipes okay, none of them being restricted? Plugged in something into the OBD-II socket that can show you the actual water temperature from the ECU? Failing that could there be a problem with the heater matrix?

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'12' Plate Mazda MX-5 2.0 litre NC 3.5 Venture Roadster 160BHP
'15' Plate SEAT LEON 184 FR TDI. 240BHP/500nm Torque.
Past: '53' Plate Yellow YRV Turbo Approx. 150BHP