Thermostat replacement - engine wont warm up?

Yep, it sounds like you have a stuck open cooling system thermostat. Here is how to change it out and its location. Before replacing it, I recommend checking the coolant temperature with a scan tool and comparing it with an infrared thermometer reading at the thermostat housing. If the radiator hose begins warming gradually from a cold start, rather than remaining relatively cool until the thermostat opens, that supports a thermostat that is leaking coolant past its valve. It looks like the water pump needs to be removed to change out the thermostat housing and the thermostat itself. Let me know if you need anything else.

Thank you for the response! Unfortunately, the manual you sent doesn't match my vehicle. My car has a 1.6L H7 engine. Could you please provide the location and replacement guide for this specific engine?

Sorry, I have a 1.6 (LH7)

The diagrams looks like it is for the 1.6 liter?