Why is the overheat indicator and low fuel indicator on when i have a full tank and my engine is not overheating?

My Pathfinder was overheating until I realised the automatic transmission fluid was 3 qts. low. Filled it and Pathy runs at normal temp.

if the pump is overheating then there is too much amp draw from the pump indicating there is a problem with the pump. replace the pump. you don`t say what or how you know the pump is overheating if its in the fuel tank and there is gas in the tank.

no year? who hot, does hot mean only the gauge when high?
engine overheats or passengers.?? LOL'
overheats parked, ???? or moving fast or BOTH?
where are you that needs A/C , Key West>? im clueless.
it was 72 hear yesterday, no A/C needed.??
so how warm was it? out side?
Any engine with a weak cooling system will in fact overheat
if the A/C is used, because of the heat the A/C dumps in front
of the engine cooling radiator. (a silly design but practical)
think of the straw that finally broke the camels back.
its perfect.
top reasons, lots:
coolant low? look in the RAD neck, dead cold, is the RAD FULL??
for now ignore side tank, levels, assume its not working at all , use RAD actual levels.

1: belts slipping, on water pump pulley
2: debris, in the 2 cores up front, in the front nose of car.
3: radiator tubes clogged, making RAD , weak.
4: not running 50% antifreeze, with boilover protection.
mine boils 265" (i just changed mine yesterday)
5: water pump bad, blades inside rusted thru, (bad service)
6: serious engine problems causing cooling system failure.
a: blown head gasket, forcing exhause gases to the water jackets.
B: same with cracked head, or block. (freeze protection ignored)
7: Engine RAD fan dead. (will cause parked , overheating for SURE)
8: a bad thermostat. they dont last forever. 5 years?
I have a video that shows what fails in a thermostat. very revealing.
did i cover it?

check out the 17 signs of overheat here. and 24 causes.
http://www.fixkick.com/overheating.html

Defective fuel sending unit.

Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.

To confirm the problem, the basic troubleshooting is required.

Click this link below and follow the troubleshooting:------

http://technoanswers.blogspot.in/2012/02/car-starting-issues.html

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For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.

clean the ground to the body at the battery.

l could suggest you to check your engine thermostat if is working. if it is found defective,replace. some say, yes, could be the head gasket. it causes also of overheating. but smoke you notice at the tail end, could be you have broken valve seal and eats up the oil. this another problem makes the engine's overheating. the 25 old old engine really need an overhaul.

P0455 does not have anything to do with overheating. This code is caused by a loose gas cap or busted eval system hose at fuel tank or evap cannister.

Do you have a coolant leak? No start is not usually related to overheat either. Have you tried to jump-start the car? I have a lot of troubleshooting steps to tell you, but I don't want to overwhelm...

No, you can't add too much coolant. Rather, it does not hurt anything if you do. Did you add it to the radiator, or to the overflow tank?

Let it cool, then remove the radiator cap, and if needed, add coolant to the radiator. Put the cap back on, and fill the overflow tank to the "full - cold" line. Start it and run it a few minutes and look for leaks. If you find no leaks, drive it for a day or two, then let it cool and check it again. If it is down a lot (without overheating), you have a leak somewhere. If you lose enough coolant, that will make it overheat. However, if it overheats, that can cause loss of coolant, when you stop the car, you will see steam and smell coolant, and often hear it boiling.

If it overheats again, make note of when it happens: driving on the highway, or stop-and-go around town. Overheating on the highway usually indicates a clogged radiator, while in-town overheating usually indicates a bad cooling fan (you don't need the fan above about 30 MPH). A bad fan is usually the fan relay, but it can be the fan thermostat (different from the engine thermostat), or a bad fan motor.

it is sometimes located on the engine bay or interior fuse box just check the labels.., or you can try turning your car on but dont start the engine try to check on the back portion or near the tank if you can hear the fuel pump. Failure or low pressure fuel pump will stall you engine.