Changing a radiator in a 1997 Pontiac Grand Am can be a difficult task. To remove the radiator, all of the radiator hoses will need to be disconnected from the radiator. The transmission lines will also need to be removed. After all of the hoses are disconnected, remove all of the clips that are holding the radiator in place. Lift the radiator up and place with a new one. All the hoses and clips will need to be put back in place with the new radiator.
Before changing the radiator on a 2001 Pontiac Montana the coolant must first be drained. After the drain remove the radiator mounts, fans, and hoses. Pull the radiator upwards.
Pull both hoses from the radiator and see if you can run water through at a high rate from your hose. It's possible that flushing the radiator did not remove some of the blockage. You may need to have the radiator professionally cleaned/rodded. If that isn't it, yea, it's probably the water pump. sometimes when a water pump is bad, you can hear a sqealing noise, not always though. it is possible for this to be the prob, but you might also check to see if a temperature sensor may be bad.
Low coolant? Radiator probably needs flushing and/or replacing after 40 years. Bad thermostat? System airbound? Water pump not circulating coolant? Hoses collapsing? Bad radiator cap?
If by "bleed" you mean drain, disconnect the lower of the two hoses (do not confuse with the pipes from the AC evaporator) and drain the coolant into a bucket. If you are flushing the system (which you should if you are changing the coolant anyway), dont bother draining it, most of the coolant will flow out anyway, just do the coolant flush and fill from the radiator.
By doing a full tuneup; changing sparks, wires, distributor cap/rotor, changing the air filter, the oil, flushing the transmission and the radiator. From there you should repair any engine leaks, replace any old vacuum hose (all of the vacuum hoses), and put a fuel system cleaner in your gas tank. I recommend Gumout with Regane as a good cleaner.
2 radiator hoses / the top radiator hose comes from the engine thermostat / and the bottom radiator hose returns to the engine water pump
Lower radiator hoses in water cooled engines are return lines. The upper radiator hoses are feed lines of hot engine water to the radiator. The reason that lower hoses are cooler is that the radiator has allowed much of the water's heat to dissipate into the air. Thus, a lower radiator hose contains cooler water than other radiator and heater hose lines.
Radiator cap
Hard water, and calcium can build up insite the hoses and get released in chungs during the flush process. These pieces can get caught in the thermostat and cause it to fail. You can try removing the thermostat or just replace it as it is an in-expensive part. You might consider re-flushing the radiator as more calcium might hit the thermostat after replacing it.
the hoses leading to and from your radiator might be clogged. If you had a rusty radiator, the rust may have clogged the hoses that carry the coolant. you should check all your hoses and even flush them out.
Radiator hoses? Heater hoses? Vacuum hoses? EVAP hoses? Need more info to help you.