Daihatsu Charade 92 Recaliente

Hello friends, I have a slightly strange overheating problem, at least for me.
Being the vehicle in progress parked with the engine in idle the temperature is normal, the electrventilator normally starts and the temperature is maintained in normal margins.
But walking the temperature rises exaggeratedly, even normally started the fan.
Already replace the bulb, it does not have the thermostat installed and apparently the water pump works well.
If someone can help me, I will thank you.

Hi hate normalnete the thermostat cannot be completely eliminated since the pressure of water in high regimenes of a new thermostat or at least the ring of the old man falls too much, then it can be the palettes of the spent water pump that does not believe you so much water thrust or the radiator that has the dough or the hive covered, check it and make me know.

Thank you Alfredo for your answer, I will replace the thermostat, I had not occurred to the water pressure, it is already very elaborate for my knowledge and apparently also for that of my mechanic.
With respect to the pump, it is allegedly changed about a year and always use specific liquid for radiators, I do not think the palettes are spent, and if the radiator uncovered and accelerated \ "it seems \" that drives water abundantly.
I am raised that I do not rehend to idle, parked.
I'm going to clean the radiator as I suggest and then comment on the results.
Thanks again.
Greetings, Oscar.

That it will seem something strange but I spend with an MB C180 in idle or in traffic nothing happened but when the vehicle run the temperature exaggeratedly.
I recommend paying attention to the head of cylinders and the board of the same

Well friends the overheating was solved \ "apparently \", clean the radiator, change coolant and lid (it was defeated).
He is no longer overheating but I am in doubt if it was a real or temporary solution since the ambient temperature is here under 15 degrees centigrados and coincided with my last tests.
I will have to wait to get out of doubt.
Thanks for your help.
Oscar.