This answer really applies to any vehicle. The A/C puts an incredible load on the engine. If you have a problem with your cooling system, it has a hard time recooperating when the A/C is on. Your A/C clutch turns on and off several times while you are driving, it does this by using a sensor on the low side (and in some cases the high side), typically it is called a pressure cycling switch. It does this automatically (assuming it's working ok, which it sounds like yours is). When your compressor comes on, your engine receives a load, and also with the condensor (usually right in front of the radiator, it looks like a radiator) on the front of the car trying to expell heat, it is harder for the cooling system to keep the engine cool, so it heats up. When your pressure drops on the low side of your A/C (this is normal) and your compressor clutch disengages (shuts off) there is less load on the engine, and as such is easier to cool. That explains the normal fluctuations you might see in temperature. If you are seeing rapid or extreme changes, which it sounds like you are, I would recommend delving into your cooling system. Start with your electric fans behind the radiator, the way they function, is that they should come on when your car is warmed up, to regulate temperature (obviously), however, they should also come on anytime your A/C is turned on, regardless of engine temperature. This is to anticipate the increased load and heat from the engine, and to immediately get air moving across the condensor, which is a vital part to the A/C system anyway. What I'm saying, is turn your A/C on, check your fan(s) If you have two and only one is spinning, I would suspect the non-functioning fan, as typically they both will spin when the A/C is on, you might be able to jumper wires to test the non-functioning fan. If the fans aren't working, then that is probably your problem, check your fans, relays, fuses, etc. If the fan(s) are functioning properly with the A/C on, turn your car off, let it cool, and check your coolant level in your radiator, if that is ok, you may have a sticking thermostat, or other restriction in your cooling system. A faulty water pump could also create a problem. If you only see overheating (or near overheating for that matter) when your A/C is on, It is, in my opinion, most likely an issue with your fan(s). Good Luck, Scott C. The Shade Tree Technician LLC / Wichita, KS
The gauge on the far right side of the gauge cluster is your engine temperature gauge. The normal operating temperature is at the half-way mark. If the needle raises above the 3/4 mark then the car is overheating. A light will come on also if it begins to overheat.
Air bubbles remaining in the system
Fault temp gauge.
Yup, it has one!
If there is no temperature gauge on a motorcycle, the way to tell if the motorcycle is overheating is by smell or feel. If the bike smells like radiator hot water, it might be overheating. If the legs of the operator start to become so warm that it is uncomfortable to ride, it might be overheating.
if the temperature goes up on ur gauge but it is not overheating means ur thermostat is no good
Engine is overheating, faulty gauge, faulty temp sensor......
Commonly check the temp gauge on the dash.
Is it overheating? If it is check the coolant level, waterpump, fan, etc. If not overheating check the wiring, temp sesnor, pcm, etc.
First off its a gauge not Gage and second the engine overheating would be the culprit their, genius.
A faulty thermostat might cause the temp gauge on the 2000 Nissan Altima to raise to hot when the car is not overheating. A faulty thermostat can cause the gauge to move up and down and might even turn the fan on.
you could have abad temp sensor
Because the gauge is broken.
Get a new gage cluster panel.
Replace sending unit
The temperature sensor is malfunctioning
It means the engine may be overheating.
If the engine is not overheating and the temp gauge reads normal, the thermostat is doing its job. If the engine is overheating, the thermostat may be stuck and in need of replacement.
AnswerIs the system overfull?, Is your gauge working?I had the same problem and I had to replace the head gaskets.
If it is not overheating then the temp gage or the sending unit are bad.
that is not a question
Is vehicle actually overheating? Could be a bad temperature sending unit or gauge Check temperature with a thermometer If thermostat does not open vehicle will overheat
the gas light is the light right under the gas gauge. it is a yellow light that comes on, just a circle!
The gauge reading has nothing to do with the overheating problem. Misleading and irritating yes, but not involved in causing it.See "Related Questions" below for discussion on replacing the temperature sending unit, and also a comprehensive diagnostic guide for overheating problems.