Partner 2000 model does not blow hot

Hello friends, I have a 2000 model Peugeot partner 1.9. When I turn on the boiler, it blows constantly, not blown hot. If the vehicle travels for hours and finds a 90 degree, it still does not blow hot. Where is the problem?

First of all, welcome to us. the radiator may be clogged. teacher. or the steering flap is defective. https://partsouq.com/ is available in Turkish support, where you can see the codes of the locations of the tracks from this site.