Problems with start up when engine is warm

Hi,

I am owner of a Skoda Fabia 1.2 HTP, year 2006, 40 kW.

I have some problems with engine temperature and start up when the engine is warm.

It isn't problem to start up when engine is cool (also in temperature -20'C). Some faults starts when engine temperature rise till 90'C and switch off engine. Then it is hard to start up. Only when accelerator pedal is engaged the engine can start. Temperature in instrument panel is 90'C but when switch of and then start up engine again it show 50'C or less.

I have checked coolant temperature sensor but resistance in any temperature was like shown in autodata.

Can somebody give some advise?

many thanks,

Davis