Why is my engine overheating?

No white smoke coming out of tailpipe

Thank you.
Is the thermostat suppose to open if you immerse it in boiling water?

Thank you!

2001 Chevy Malibu. Overheating. Replaced thermostat, water pump, heat sensor, Radiator clear now heater blows cold air and still overheating

If I put water and not anti freeze cause it is throwing it out any way when I get to my location water spills out and fans are not working what does what does that indicate?

How do I go about doing that

Ok, will it run 100% after that? So is that why my heater doesnt work?

Ok thanks we will look into it. Appreciate your help. Will go into battle with it! Thanks

Engine Cooling problem
2001 Chevy Malibu 6 cyl Front Wheel Drive Automatic

I have an '01 malibu, I've had the intake manifold gasket, thermostat and the temp. Sensor replaced but it is still getting hot and seems to be losing fluid without any signs of leaking (stains on driveway.) It has been about 3 months since a new thermostat was installed and it went up to 260+ with the red warning light coming on, I pulled the hood latch button from inside the car and continued home (about 3 blocks, ) by the time I pulled into my driveway the temp. Started dropping almost as fast as it went up. I let it sit for a couple days and attempted to drive it again (hoping it was a fluke, ) and it began to get hot again. What do I look into now? Thank you for your time.

The work was completed at a shop by certified mechanics, I can't say with 100% certainty, but I would imagine they did. The parts were replaced about 6months ago, and a second 'stat was installed about 2-3 months ago. Now it's getting hot again, I'm at a loss and the shops are crazy expensive ($275 just to replace the last 'stat.)

Before any damage is done, you might want to check the oil level and see if it is too high and/or has a chocolate milk looking oil on it. Also pull the plug where you install oil in the engine doing an oil change. Look for the same chocolate milk looking substance on the cap and look down in the valve cover where the rocker arms are for the same substance. Any signs of this indicates the coolant is leaking internally in the engine, probably due to the intake leaking internally (even though it was recently done).