Head gasket changed

Had my head gadget changed on my 95 300 tdi disco , The temperature would get up to the red . After the gasket change there is no problem at all except my heaters are not as warm as they were.
I've filled up the coolant through the bung and bled it many times , Could it be the thermostat?

Cheers

could be, does it lose coolant,

jamesmartin said:

could be, does it lose coolant,

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No James , I've got a thermostat here so thought I might as well change it.

start there , have you driven far since head gasket change

jamesmartin said:

start there , have you driven far since head gasket change

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Yes mate ,The gasket was changed about 3 months ago. But it's getting a bit chillier now. Cheers anyway ,I'll change it in the morning (weather permitting)