My cadillac is not giving me any hot air ,ive replaced the radiator, changed the thermostat, has a new water pump, where do istart to look.

A worn water pump is the most likely. If the coolant is going down, the water is going somewhere.

The most common reasons an Oldsmobile Alero is overheating are a coolant leak (water pump, radiator, hose etc.), the radiator fan, or a failed thermostat. Coolant leak (water pump, radiator, hose etc.)

Oldsmobile Alero Overheating - RepairPal

Videos on overheating. You probably have air in the system from when you replaced the thermostat. The coolant system needs 'burping' of air.

https://www.google.com/search?q=2000+Oldsmobile+Alero+running+ho

Burping

https://www.google.com/search?q=burping+coolant+system

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Check for air lock,radiator is good and water pump.check coolant level.

is the electric fan turning on driving at high speeds gives it air flow that the fan would give when not driving fast

occasional sticking of the thermostat may be the culprit if it has not been replaced or may be seizing up

i didn't see you last posting about your water pump but theres is a tiny radiator called a heater core. it has the same hot water running through it as your big radiator and engine have.so when you turn your thermostat to hot and kick on the fan the fan blows through the heater core and wallaa you have heat you probably need a thermostat.if you have no heat and it is overheating hear and there that's probably what you need.make sure you see if you filled the radiator up all the way when you changed the water pump.

If you are doing them all at the same time, do the water pump first. I like to do the toughest part first and then move on the the easier parts. Then the thermostat and then the radiator. Once you drain the radiator most of the engine coolant will come out making the waterpump easier to clean up. If you are doing them in different day's, alway's replace the waterpump and thermostat in pairs. If you can do the radiator at the same time, I would suggest that. Sometimes when thermostats get out of fluid, they sometimes will lock up and cause and overheat. Then you are replacing all the fluid and thermostat on a hot engine.

Well there could be a couple of problems if you live in a hot place you should change the thermostat to a lower tempatured one so the water will circulate sooner that will help it run cooler if that doesn't do it it might need the radiator flushed.

do the best you can to look through the radiator with a flash light. if you can not see any light from top to bottom replace the radiator. get an aluminum one. ive had this problem myself. i changed everything before tackeling the radiator also. with no luck until i changed my radiator. remember if light wont pass neither will air.

hi it mite be that the water pumps impeller is made of plastic on these models an they break up after time (very common on audis an vw same engines)and dont pump the water effectivley the car constantley over heat.the solution is to but a pump wid a metal impeller ive had the same problem on my audi a3 turbo..also changing the thermostat is an option...hope this helps

My retired uncle has a 97 cadillac deville sts that runs well but after a short distance or time idling begins to overheat. He has replaced the water pump, thermostat and had the radiator and head gasket checked. Unfortunately he lives in a rural area and there is no local cadillac dealership for diagnostic repairs.