A radiator has no moving parts. It's only job is to dissipate the heat of combustion in your engine. If it doesn't do that job, it's bad. One of the most insidious faults a radiator can have is rust and corrosion build up inside the radiator. This keeps the fluid from circulating. Many times, this cannot be seen. A corroded radiator is a bad radiator. A leaky radiator is a bad radiator; it can't hold the fluid. A radiator with a majority of the cooling fins bent so that air can't pass through is a bad radiator; it can't cool the fluid. One of the tests they do on radiators is to pump them up with air and listen for whistling leaks. Sometimes, they submerge them in a bath to see if any bubbles form, and if they form, where they're coming from. If bubbles do form, it is a bad radiator.
how can you tell if you need a radiator in a 99 cadillac northstar engine
Usually the rubber will be hard and cracking
Bad seal Bad spring Bad neck on radiator
Top hose of radiator is hot and engine is still over heating usually.
Rent or aquire a temperature gun and make sure the heat off the radiator is within 15 degrees of the operating temp.
Radiator fan could be bad, fan relay bad, fuse blown. Also if your ECT (engine coolant temperature) sensor is bad the ECM (computer) won't know to tell the fan to turn on.
A bad radiator is a radiator that is leaking or clogged. If you are loosing coolant then you have a leak that should be easy to find if the leak is at the radiator. If it is clogged your engine will overheat.
Bad radiator fluid.
your radiator clogged up.cheaper to get a new radiator. nothing to do with the radiator cap.
Plug a scanner into the ALDL port, then turn the ignition to "ON". The radiator fan should come on. If it does the relay is working. If the fan does not come on it doesn't mean the relay is necessarily bad. That could mean the relay is bad, or the fuse is blown, or the fan itself has failed.
Run engine to normal operating temperature witout radiator cap Observe coolant circulation If coolant blows out of radiator - could be a stuck thermostat If no circulation could be a bad water pump
Bad thermostat, fans not working or coming on when they are supposed to, bad waterpump, bad radiator or radiator cap.