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This means your cooling system is not working properly. First check your coolant level, this is the most common cause of overheating. Top it up if necessary and watch it for the next few days, refilling when necessary.Take a water hose or air hose and clean out the cooling fins on your radiator, paying close attention to the lower rad. Quite often they get plugged with debris and will imair your cooling ability. Blow out from the engine side, this way you are going against the flow and it should clean easier. Next, let it heat up and watch to see if the cooling fans come on. There are a set of temp sensors to turn them on and off so this problem will likely need to be sorted out by a mechanic. It could also be that your cooling system is partially blocked, which would suggest that a flushing is in order.
ANY TIME YOU CHANGE RADIATOR ONCE YOU GET THE NEW RADIATOR IN PLACE.FILL RADIATOR WITH ANTIFREEZE CRANK VECHICLE UNTIL THERMOSTAT OPEN. WHEN YOU TOUCH THE TOP RADIATOR HOSE.IF TOP HOSE HOT THERMOSTAT OPEN.CHECK RADIATOR COOLANT LEVEL IF DROPPED ANY.ADD COOLANT UNTIL LEVEL QUIT DROPPING. WHEN COOLANT LEVEL QUIT DROPPING YOUR COOLANT LEVEL IS CORRECT. NO MORE AIR IN COOLANT SYSTEM OR AROUND COOLANT TEMPERATURE SENSOR COOLANT FAN SHOULD TURN ON ONCE ENGINE GET TO CERTAIN COOLANT TEMPERATURE.SEE IF COOLANT TOO LOW NOT ENOUGH COOLANT REACH COOLANT TEMPERATURE SENSOR. SENSOR CANT TURN ON FANS IF ITS NOT IN HOT COOLANT. WHICH DECREASE ITS RESISTANCE WHICH CLOSE OR GROUND CIRCUIT CAUSING COOLING FANS TURN ON.
You are talking about the thermo electric cooling fan, its operation
is independent of the car's electical system. It is switched on and off
by the engine temperature. When you park, the engine heat soaks upward
to heat the thermostat turning the fan on. It will run until the engine
cools down and the thermostat switches it off. Quite normal operation.
It sounds like you do need a thermostat with your heat shut off and the gauge will raise a little then the car doesn't have that heat drawn from it indicating that you most likely do need a thermostat. As far as the fans coming on immediatly that could be a different problem it is most likely the coolant temperature sensor that tells the fan's when to come on. If this sensor says the coolant is hot the fans will come on immediatly. These are seperate problems as the coolant temperature sensor does not have anything to do with the cabin heating system. You should first check the level of your coolant is full, This could also cause your cabin heating system to perform poorly, and may have adverse effects to the engine cooling system. (fans)
high pressure is usually from heat not being removed from freon in the condensor. Usually it's because the cooling fan is not sucking air through the condensor. Check your cooling fan relays (3) in the battery box in front of the battery. Also, check to see if cooling fan has failed.
Does it work ok when the engine is cold and then quit after engine warm up? That would be a clue. When pressure gets too high, there is a high pressure cut-off switch.
Other posibility is a restrcition in the system. not common though.
I agree with philip, i have not studied the electrical system. but to my best guess the electric fans are tied into the engine cooling system. when the engine is not requesting the fans to come on. then their is very little air passing threw the cooling package. When their is no cool air passing by the condenser this will not draw the heat out of the refrigerant leaving excess heat in the system and when the cab fan blows this is were the excess heat is getting dumped. then at higher speeds their is enough air passing threw the condenser and radiator to cool them both.
2000 LS cooling system is a very tough system to diagnosis. Any kind of air in system will totally stop the flow and cause it to heat.That is the reason it has 2 places to bleed the air from the system.The one at the engine where the upper hose connects and one beside the brake booster near the degas bottle(rubber tube with a screw end).
The cooling fan is also hydraulic and has it's own power steering pump. The good thing about this system is that it uses a cylinder head temp sensor that measures the metal temp and not engine coolant temp. When the PCM sees the CHT reach a certain temp it will start shutting down 4 cylinders at a time and use these cylinders as actual air pumps to help cool the engine down.If this does not work it will then shut the engine down totally until the temps come back down.
The most common problems we see are thermostats,crack degas bottle,or a leak somewhere,and of course air in the system. Have not seen a cracked head yet however did see one that pushed the plug out of the cooling port in the head but this also filled the oil with coolant.
Have also seen cooling fans that would not work until PCM demmanded high speed,caused by a weak power steering pump.