* Clogged radiator. A clogged radiator can restrict the flow of coolant, which can also cause the top radiator hose to collapse.
* Faulty thermostat. A faulty thermostat can prevent the coolant from flowing properly, which can cause the top radiator hose to collapse.
* Water pump failure. A failed water pump cannot circulate coolant through the system, which can cause the top radiator hose to collapse.
* Blown head gasket. A blown head gasket can allow combustion gases to enter the cooling system, which can cause the top radiator hose to collapse.
* Faulty radiator cap. A faulty radiator cap cannot maintain the correct pressure in the cooling system, which can cause the top radiator hose to collapse.