Car coolant very hot! It smells when i get out the car?

I have recently bought an 03 1.4 ford fiesta petrol. Everything was rosey until i went to the shop yesterday and when i got out all i could smell was coolant! I opened the bonnet and the coolant was bubbling and very warm to touch! Not scolding but hot! Ive checked all possible signs of a head gasket and nothing. The car its self isnt over heating its just the coolant. Thermostat in the car hardly budges. Can anyone help me out with what to check and how? Im limited to what tools i have but the garage are trying to charge a fortune!

Thanks for reading

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