My 1995 ls400 is running hot after driving less than half a mile after it warms up, I replaced the thermostat after I noticed the temp would go up after I would idle in the drive through but the temp would go down after I would drive off, what should I look at next I also drain the radiator and filled it up.

May be its low on coolant or radiator hoses clogged or its thermostat issue,its remaining closed or it can be issue with coolant leaking from somewhere.Or cooling fan not running when when engine gets warm.
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There are many other possibilities causing these issues.:----
To troubleshoot the issue yourself,i provide you few very helpful links with solutions:-----
Click the link below:----

Dodge Dakota stalls, stumbles at idle. Has low fuel flow and runs hot?

http://schematicsdiagram.blogspot.in/2012/03/dodge-dakota-stallsstumbles-at-idlehas.html

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1991 Toyota Trecel: Engine Starts fine but dies when gets Warm?

http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html

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1995 Lexus LS400: Running Hot?

http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html

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Multiple problems on car: Car runs hot, A/C blows hot and car starts surging?
http://schematicsdiagram.blogspot.in/2012/04/multiple-problems-on-car-car-runs-hotac.html


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There are many possibilities for car overheating.

Faulty thermostat clogged radiator/plugged radiator, radiator hose worn out. Coolant running low. Low coolant pressure. Faulty temperate sensor.

I suggest you to go through the troubleshooting details mentioned in the link below:-----

All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html

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These will help.

Thanks.

How do you know it gets hot? Are you going by the temperature gauge on the dash? Or have you checked under the hood and found out the engine really is running hot? ...Reason I ask is, something just doesn't sound right in your description. After just 5 minutes from starting and driving away, the engine would not yet be at normal operating temperature. That would explain the heater not yet warm. But the temp. gauge says hot?
If so, I would replace the temperature sending unit on the engine. the one for the dash gauge, and see if that was the problem-not reading the temp. accurately.
Couple of other things: Are you sure you got all the air out of the coolant system? Start the car with the radiator cap off and let it run until the engine is warmed up fully, then shut it off and install the cap. Does your reservoir tank stay about half full where it should be, between the full-hot and full-cold marks?
If your problem persists. I would have the coolant system pressure tested, and see if you could get a true temperature reading of the coolant when it seems to be running hot.
Good luck.

Sounds Like A Problem With your thermostat. Good Luck

Your coolant is low, and you may have a leak in the system.

depending on what temp your thermostat is,sometimes some engines run warmer,make sure it doesn'r run hot,and keep flushed with new antifreeze every 12,000 miles.










TIM...

Make sure coolant level is good and no leaks. Check that belts are there and tight( when you push down on belts with finger it should only move about half to one inch). Also check temp. with hand held thermometer at ends of rad. hoses at the motor. Temp reading should concur with car gauge ( if not gauge maybe faulty) If all is good consider thermostat replacement ASAP

the thermostst is most likly stuck in the open position letting the coolant flow freely through the engine and keep recuirculating not giving it a chance to stay in the engine block to warm up. i would replace the thermostat

During the winter time the engine may not produce enough heat to go half way. You can modify this by installing a hotter thermostat. But I would not go more that 20 degrees F though, or you could create issues for summer driving.

oddly enough it sounds like a transmission problem, get a transmission shop to assess the problem, but first try replacing the thermostat. be sure to turn on the heater when adding antifreeze. I have had this problem with my windstar.