My 1999 Chevy Monte Carlo is overheating to near hot?

Sounds like a head gasket leaking into the cooling system

Hi Shan, If it's leaking out the overflow I'd replace the radiator cap, Hope this helps.....CHEERS..

if it has a viscous fan hub ( not electric fans ) then replace the hub

This area is usually a head gasket but you should have it checked out.It could just be a heater hose.You will need to get it pressure tested.Hope this helps good luck.

THEN THE HEAD GASKET IS BAD IF LEAKING ABOVE THE WATER PUMP.

There a heater control valves behind the dash which is either broken or have gotten stuck. The valve behind the dash act as on and off switch as as you would turn your faucet on and off. they tend to get stuck due to heat. The valve basically allowed hot antifreeze water to flow though the heater core giving you heat. when the valve broken or stuck open, the hot antifreeze will continuous flow to the heater core, therefore is the reason why you get constant heat. It a nightmare to fix, you will have to take the dash apart to get to it. the part run somewhere in 40 bucks. if your not mechanical incline, my suggestion would be the next time you get oil change from your local chevy dealership is to ask around those GM mechanic (Do not ask the Manager) and see who does side work; negoiate with him this way you will save big buck on dealership shop hours. Have only authorize GM to do the repair, not your local repairshop. Tearing into any automotive dashboard its every mechanics nightmare. Good luck!!!

if you have a bad sensor the check engine light would come on sounds like a leaking head gasket

It's a 99% chance of water pump leak or the housing at the timing chain that the water pump sits on.
Water pumps can and do leak one minute then seal themselves.
A cheap fix most use is go to a 7 lb pressure cap on the rad.

Thermostat is probably stuck closed... Run the car with the cap of the bottle or radiator and see if it starts to circulate when it gets hot... Be careful though because it can over heat and have no coolant flowing.. And also watch for spewing fluid if it get hot at the place you took the cap off.... The low coolant could also mean the radiator is not full but the bottle is... Check for a restriction from the bottle to the radiator.. If you see a sensor on the bottle it could be bad... But That won't cause it to over heat. It'll just say low coolant because the switch is stuck.
Also does the fan come on while it's getting hot?
If not that could be the reason for the overheating.. And the coolant level sensor could be bad telling you it's low
Cap off look for circulation of antifreeze.
At the same time before it over heats make sure fan is coming on. No fan on? Fan fuse or relay could be bad... Also maybe a wire.
No circulation? Thermostate stuck or restriction in coolant hose...Line... Radiator..... And worse case scenario the water pump might be bad.
The low level I wouldn't worry about. Find out why it's over heating first.

yes it the fuel pump . the float is getting stuck