2000 Chevy Impala - Temperature gauge goes into the red quickly. I had cooling fan assembly replaced 2 months ago because car temperature gauge used to go into the red and sometimes stall.

ALL tHAT IS NORMAL
AND 200F STAT THE FAN KICKS IN AT 225F AND BOILS AT 265f
THE DASH GAUGE IS ONLY TOY, BUT ONCE USED TO IT ,IT HAS MERIT.

ONLY a SCAN TOOL USING PID SCANS TO THE ECT TELLS THE TRUTH. OR LACKING AN IR THERMO GUN, TOOL.

MUST BE YOUR FIRST CAR AND CLUSTER WITH CHEAP GAUGES.
NOTHING NEW THERE,

top cause of overheating, is THE THERMOSTAT
NEVER LASTED 22 YEARS EVER.
I'D NEVER RISK ANY GOOD ENGINE WITH SOME OLD STAT.

mark ask your dad if that gauge looks odd.
even on hills the fans come on, 100% normal
HOT DAYS, YES
FOR SURE AT STOP SIGNALS , CAR STOPPED, SO FAN GOES ON.
A/C ON yES
UP HILLS YES.
PULLING LOADS (TRAILER) OR TRUNK FULL OF BRICKS, YES.
THE GAUGE MUST NOT MAX OUT AND PEG,
OR CAUSE:
ENGINE POWER TO DROP OR HEAR PING.
OR CAUSE STEAM UNDER THE HOOD
NOR COOLANT TO THE GROUND
ASK DAD AGAIN,

Engine Temperature Issue - Please Help! - Mazda 6 Forums : Mazda 6 ...

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Sep 12, 2011 - Join Date: Mar 2006 ... to the gauge) and then after being shut off for 5 minutes, show COLD. ... I'll also confirm, with my AP, that my ECT is around 200 like it normally is. .... VSS, and ECT signals and calculate radiator's heat the radiation ... I noticed my engine temp needle was dipping down and then came ... CEL - Throwing code P0126 (Insufficient Coolant Temperature ...
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It could be the thermostat but you need to check the fluid level and for any leaks (these could even be pin hole) first. If you have one of those infra-red temperature gauges you can check the temperature of the cooling system in the engine bay to double check. Generally the engine temperature should not go much about 90 deg C - this is when the electric cooling fans kick in - are these turning on?

fans came late on those car,like 212 and second fan comes on at 224,you reprogram it to come a lot sooner,,other thing is there might be gunk inside the block,and coolant has hard time to pass through,and staying longer than enough in block temp goes high,even tough the radiator is doing it's job,it is just coming out block lot hotter than it suppose to be,and gauge read the block not the radiator

Check your coolant levels. If the temperature isn't much higher than normal, you may be fine, or you may have a Coolant Temperature Sensor going bad, and reporting the incorrect temperature. Even though the thermostat was replaced 8 months ago, it is possible it is already going bad again. I believe this is more of a Coolant Temp. Sensor fault though. The cooling fans are On when the AC is on. With the AC off, the cooling fans come on when the engine reaches a certain temperature, and cut off once the temperature is back in range. The Coolant Temperature sensor shouldn't cost much, and is easy to replace. I would start with that, top it off with coolant, and then maybe change the thermostat.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

You probably need to bleed the cooling system properly.

Open the cooling system bleeder screws.

Slowly fill the cooling system with a 50/50 coolant mixture until coolant runs freely out of bleeder screws.
Close the cooling system bleeder screws
Install the coolant pressure cap
Start the engine.
Run the engine at 2,000 - 2,500 RPM until the engine reaches normal operating temperature. (midway on gauge)
Allow the engine to idle for 3 minutes.
Shut the engine off.
Allow the engine to completely cool.
Top off the coolant as necessary.
Run engine again at 2000 - 2500 RPM until the engine reaches normal operating temperature.
Allow engine to idle until cooling fans come on. It should come on with the gauge about 3/4 of the way to red. - if it gets to where is touches the red, shut down immediately.
When the fan comes on, put your hand behind the fan and observe the temperature of the air coming from the fan. It should feel hot. If it is blowing cold air, the coolant is not circulating through the radiator like it should. This could be caused by lots of things including an improper/defective thermostat, corroded water pump impeller, or a blown head gasket.

get your temperature censor(s) replaced. this will cause the fan to not come on if it is not functioning properly. usually the temp censor is somewhere that it can have coolant running on it so it can read the temperature on your car. your car will have one for the gauge and another one to turn the fan on and send signals to your ECM i suggest you replace both.

Check the rad fan relay i have seen that failure common on that car

This link has a diagram showing the location of the relay: http://autorepair.about.com/library/faqs/bl581g.htm

The Pulse Width Modulated (PWM) radiator cooling fan relay is located behind the front bumper fascia below the right head lamp.

Have you check rad fan operation?