I know there are threads on similar problems, but I need to explain mine, please.

1. I'v had the cylinder head skimmed.
2. the head gasket renewed
3. a new water pump
4. a new timing belt

For a week or two after everything was fine, plenty of heat, but now we are misting up, heater somtimes blowing cold,warm, then hot, but mainly just warm, also I notice the temp gauge go up to 3/4.
Can someone give me advice on what could be wrong please?

If your temp gauge is that high you shouldnt be driving it, I wouldnt

Have you checked the thermostat operates and the radiator fan engages (or fans if it's a diesel)?

not driving it, wil check if fancomes in/on, thanks

just one point though, how does the fan coming in/on effect the heater inside the car? thanks

electron said:

just one point though, how does the fan coming in/on effect the heater inside the car? thanks

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The simplest explanation is that if the radiator or thermostat gets hot enough the heater matrix can become locked off by some of the thermodynamic properties of the coolant, it's happened to me once (due to low coolant levels and the engine heating too quickly for the rad fan to have any meaningful effect on the fluid temperatures)

Check your coolant levels and your carpets are dry, maybe a leaky heater matrix?

Try bleeding the system fully, may have a moving airlock!

I suspect the steamy windows is a big clue that the heater matrix or pipes into it are leaking. Leaking coolant = steam. If there is the correct coolant in the system there wont be any doubt - it smells - like coolant.

But if there is any doubt about an air bubble in the cooling system dont drive until its sorted or you will be looking at another head gasket.

BTW, did you get the head crack tested after the original gasket failed?