Why would the hoses connected to the radiator collapse? and what would the fix for this be? The engine did not seem to be overheating and it does not seem to be leaking.

overheating is caused by:
1. Coolant mixture is wrong has to be 50/50
2. Thermostat
3. Radiator cap
4. Obstructed radiator INSIDE the coils
5. Obstructed radiator outside
6. Bad water pump
7. radiator hose collapse

Air pocket stuck near cooling fan switch. Look for a brass flat headed screw near the upper radiator hose. Crack it open slightly while the engine is running and at operating temperature. It'll bubble a bit. Close it when only coolant streams out of the hole (gently, it's brass so it can break easily).

Connie, Were the radiator,water pump and thermostat replaced to try and fix the over heat issue or as maintenance. Engine overheating can be caused by a lot of things, Leak in cooling system, air in system, bad rad. cap, slipping belt, faulty thermostat or installed upside down, faulty water pump, plugged radiator (inside/outside), collapsing rad hose, faulty cooling fan, leaking head gasket, sludge plugging engine water passages, poorly tuned engine, etc..
Take into a good shop for diagnoses and estimate for repair. Check the attached links,instruction and guides, Good luck
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How to Troubleshoot an Overheating Engine
Steve Litt Overheating Guide
Diagnose Engine Overheating Auto Repair Help
How to Troubleshoot an Overheating Engine DoItYourself com

Steve, there's many causes of overheating. You say you have a new water pump and thermostat, so it's obviously not those at fault.

Just a question ... you say your car is not cooling, but is it actually overheating? A faulty temperature sender unit (it screws into the engine block, usually..) can give an incorrect reading on your gauge.

If it is overheating - steam/you can feel the excess heat - is your radiator fan kicking in? Is your car overheating as soon as you drive it? Or overheating when stuck in traffic .. and the fan isn't kicking in..?

Other things that cause overheating which spring to mind include a blocked radiator and/or a collapsed radiator hose.

Hot coolant enters your radiator via the TOP hose and cools as it goes down the radiator, then back into the engine via the bottom hose. Check both top and bottom hose after the engine has warmed - sometimes a hose can become 'flat' and blocked.

Another thing that causes overheating is a burnt head gasket/cylinder head problem.

Switch the engine on and look at your coolant bottle - a continuous 'bubbling' indicates that exhaust gases are finding their way (via a burnt head gasket) into the cooling system.

Any oil in the coolant bottle also indicates cylinder head problems. Also check the oil dipstick. If coolant (because of a defective head gasket/head) has found its way into the oil system the oil on your dipstick may appear a creamy/greyish sludge.

The radiator is most likely plugged. Flushing is the least expensive way to try to fix the problem. It may not clear a severely plugged radiator. Watch the lower radiator hose with the engine running. Accelerate the engine. If the hose tries to collapse, then the radiator is definitely plugged.

How many miles on system. One item that most people never check and it has burned up too many motors to mention is the bottom radiator hose. The hose gets soft with age and it will look normal when you are looking at it, but once the engine is warm and the motor starts running at a faster speed, the volume of water moving through the system creates a suction that collapses the lower radiator hose and the engine gets hot because there is not enough circulation. If you have higher miles or years and haven't changed the upper and lower radiator hose, do so any way.

collapsing bottom radiator hose indicates blocked radiator cores
would be time for a new radiator after you again flush out the cooling system completely
have the radiator shop fitting the new radiator do the flush as they know how to do it properly

With the engine cold remove the radiator cap. Start the engine. Watch the coolant. If you see bubbles constantly perkulating out of the coolant than you most likely have a head gasket that has failed. If you don't see a constant perkulation of air bubbles it probably wouldn't hurt to replace the upper hose and see if the problem is resolved.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

change lower hose as it is on suction side. it could be collapsing.

Heres a couple of things you can check. Start your car and remove the radiator cap,(before it gets hot mind you) when it reaches norm operating temp, look inside radiator to see if water is circulating. If its not moving, its a bad water pump. Also, youre hoses should never collapse, if they collapse when they get hot maybe you need new hoses? Finally, if those dont work, flush out your radiator. Open the bottom cockpit and use a garden hose and let it flush out the system while the car is running, about 10 mins should do the trick. If the radiator looks clean inside then it doesnt need flushed.