HI TEMP / LOW OIL LIGHT 2003 EXPEDITION 4.6

faulty stepper motors in your cluster. and its 03-06 GM vehicles that are affected. and no there isnt a glitch in all chevy cars you smoke too much u paranoid freak. you can fix this yourself for about 40 bucks. heres how i did it. click the link

http://www.naioa.com/v2/modules.php?name=Forums&file=viewtopic&t=28085&highlight=

Source: I have a 2005 chevy Impala temp gauge going crazy

This has an electric pressure gauge with a sending unit. Try this: When at idle, SLOWLY increase the engine speed. If the needle on the pressure gauge all of a sudden leaps to a pressure (like 'real quick') and acts normally with even faster engine speeds, the sending unit is bad. (It is just not reading the lower pressures.) Zero engine pressure will manifest itself in a bunch of knocky sounds and lifters that aren't pumping up and therefore "ticking" loudly. You probably don't have that since you didn't mention these problems.
Replace the sending unit after the above test and you should be fine.

Testimonial: "Thank you. you may have just saved me a lot of time and grief"

Source: oil pressure gauge drops to zero when

If your oil pressure is dropping to zero at an idle, then I would quit driving the vehicle. It is very possible that the engine is low on oil. Or that the oil pump is going bad. If you continue to drive the vehicle, you could ruin the engine. There is a oil pressure sending unit that could be bad. But if the oil pressure goes up when it is above an idle, then the sending unit is probably ok.

Source: oil pressure gauge drops to

Low oil pressure can and will destroy your engine. Check the oil level. If it's full or just a little low (1quart or little lower) then you have a serious problem already. If it is lower than a quart and a half, re-fill it and check pressure. If it's OK, then find the leak and fix it. If after filling it pressure does not return to normal then you already have a serious problem. have the actual pressure checked with a mechanical gauge and proceed from there. (likely bad bearings) If main bearings are involved, unless you remove the engine and re-grind the crankshaft and clean out the oil passages, you are wasting your $. Usually cheaper to replace the engine and more reliable as well.

Source: Oil Pressure Gauge Drops to zero when Idle and

The dealer replaced the radiator fan controller twice- said there was a second recall.

Source: overheating on a 2003 mitsu outlander

this problem sounds like a bad ground to your gauges first check your fuses with a test light take the end of light ground on battery with a long wire with alligator clip on end so you can reach around to test second thing take probe tip touch pos of battery to make sure tester lights then test all fuses first both sides most fuses have two little holes one on each side on top to put probe on fuses should light up on both sides some fuses wont light on both unless the ignition is turned to acce or for instant a headlight switch has to be on to test fuse if fuses check out okay you will have to get into the gauge instrument cluster possible if these gauges are pushed into a pin type or flat circuit board its possible loose scews and a good bump would make a bad contact in the cluster

Source: feul temp oil pressure gauge not working