When an engine is shut down, the coolant temperature begins to drop. If the vacuum valve in the radiator cap fails, the resulting vacuum in the cooling system can cause a radiator hose to collapse
SOURCE: bottom radiator hose cold. upper radiator bulging.
The fan won't come on because the thermoswitch is in the bottom of the radiator, without coolant flow the switch never gets hot. Just because a part is new doesn't mean it is good, is the thermostat an aftermarket part ? I would take out the thermostat (leave the gasket) and see if the bottom hose gets warm. If the bottom hose does not get warm, you may have a blockage or bad water pump
SOURCE: how to repair the housing the upper radiator hose
it is not safe to repair this part, if it fails and you loose your coolant the engine is ruined very quickly from overheating, replace it.
SOURCE: how to replace a radiator on a 2002 chevy blazer?
radiator needs no special tools wrenches and ratchet i would replace all hoses connecting to the radiator and thermostat would be a good idea to ensure no overheating
SOURCE: 2002 dodge 1500 Changed radiator, thermostat, and hoses. No heat
Why was radiator replaced?Did it have heat before ? If it was plugged, the heater core may also be plugged. Try flushing it with a water hose in both directions. I dont know why the botton radiator hose would be cold, the radiator should be a uniform temp and the air coming through the radiator should be HOT, when the engine is at operating temp. What condition was the old coolant? if it was rusty, the water pump may have lower flow than normal.
SOURCE: 2002 ford focus svt, overheating,
If I understand your problem correctly if sounds as if the engine mount bolts broke which allowed the engine to drop which may have kinked your radiator hose, that caused a flow problem and the engine over heated.
If this is what you are saying it is possible the inner liner of the hose ruptured and folded in causeing a restriction in the hose, this use to be fairly common with hose's in the 50's and 60's but is pretty rare these days.
You need to check the hose for soft spots, if you do not find anything there its time for some tests, the first would be to remove the thermostat and run the engine to see if you have flow in the radiator, if your radiator has a cap at the side tank run the engine with the coolant a little low, if there is flow your will be able to see the coolant coming out of the tubes inside at the top of the core. If there is no flow you need to take a better look at the hose and possible the water pump impeller.
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