Water level was low thats why it blew cold ,you may have a slight leak somewhere but once the level drops below a critical amount then it will overheat so ask a local mechanic to have a good look for you as this sort of problem is often beyond the scope of a owner to locate the leak ,when running check the difference between the top and bottom rad hoses as well if bottom hose cold then it could be the thermostat .
possible ,the impeller is plastic and the drive shaft is metal and they can seperate so the impeller isnt turning as it should ,i would have expected it to the other way around though with it overheating in the city but w2ho knows with taking it apart and having a look at the impeller .
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SOURCE: Overheating
maybe 3 things....leaking intake manifold gasket(very common on this car because pontiac used plastic manifold gaskets) may also be air in the system....bleed screw is located on the top hose and is painted blue. it may have some air cavitation. you may have a leaky or bad seal on overflow cap. check your oil dip stick...if there is a milk shake type foam look to it then the gaskets are ready to fail. get a compression test done and it will confirm everything the easy way. harbor freight sells a radiator pressure test kit and it works like a champ and its cheap....good luck
SOURCE: 99 Cadillac Seville STS overheating
Check for coolant flow at the Purge line,this is a common problem on the Northstar.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With
the engine idling,pull the purge line from the tank,if there is no
coolant flow from this small hose,it is blocked and this will cause
overheating.If the hose is clear, check for blockage at the nipple on the tank.
SOURCE: 1995 nissan maxima overheating
you possibly need a thermostat or even a water pump you can fill up the coolant at the radiator cap..its a silver cap near the front ov the car you need to push down on it and turn counter clockwise
SOURCE: 1991 camaro overheating
There are two freeze out plugs at the rear of the block (V8) and many v6 engines. If coolant is coming from where you say, likely they have failed. Unfortunately, the only way to reach them is to remove engine or transmission, It's rare that they fail because they are "protected " by the bellhousing, but can still rot from the inside out. There is no sealer known to man that will fix this. It's a shame that you need to do all that work for a pair of $2.00 plugs, but that's what needs to happen.
SOURCE: 2003 Protege 5 overheating on long runs.
I just replaced the radiator and thermostat on my 03. The radiator was defective (corroded) on the lip where the cap seals. This allowed coolant to be spat out. The thermostat was also sticking closed after new radiator and this caused overheating. Replace both while in there for under $100 if doing it yourself.
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I put a thermostat on it, and a serpentine belt. But if I'm driving the highway, it'll overheat. If I'm in the city, it won't. Could that be the waterpump though. But I'm not losing any coolant anywhere.
I have a 99 Cadillac D'Elegance, that just started overheating. It didn't lose anti freeze/coolant until after it overheated. I turned the heat up to the highest temp. and it blew out cool air. What could be the problem???
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