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Temperature

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Symptoms of a Bad or Failing Evaporator Temperature Sensor (Switch)
Common signs include lack of cold air coming from AC, temperature fluctuations, and the AC compressor not activating.
Is it Safe to Drive With a Fever?
A fever is considered a higher than normal body temperature. A fever can be caused by viruses, bacteria, drugs, toxins, or fungi. Normally a fever comes with other symptoms depending on the type...
How to Replace an Air Cleaner Temperature Sensor
The air cleaner temperature sensor allows the computer to adjust engine timing and air/fuel ratio. A rough idle or "engine lag" are signs of failure.
P0495 OBD-II Trouble Code: Fan Speed High
Diagnostic Trouble Code (DTC): P0495 P0495 code definition The P0495 code is stored when the PCM has detected a voltage reading that is too high from the electric cooling fan control...
How to Replace a Cylinder Head Coolant Temperature Sensor
Signs of coolant temperature sensor failures include sluggish acceleration, hard starting, and a Check Engine or Service Engine Soon Light.
How to Replace an Ambient Temperature Sensor
The ambient temperature sensor monitors the car's temperature inside and out. This sensor allows the AC to maintain comfortable cabin temperatures.
P0516 OBD-II Trouble Code: Battery Temperature Sensor Circuit Low
Diagnostic Trouble Code (DTC): P0516 P0516 code definition The PCM stores the P0516 code when the battery temperature sensor circuit has reported a temperature reading that is lower than the preset...
How to Replace an Evaporator Temperature Sensor (Switch)
The air conditioning system has an evaporator temperature sensor that fails when there is no cold air or the air conditioning is inconsistent.
What Does the Coolant Temperature Warning Light Mean?
The coolant temperature warning light turns on when your engine is sensed to be too hot and is at risk of damage from overheating.
Symptoms of a Bad or Failing Battery Temperature Sensor
Common signs include engine surging, low battery voltage, and an illuminated Battery Light.
How to Diagnose a Cooling System Problem
You may be driving down the road or sitting at a stop light when...
How to Replace a Coolant Temperature Sensor
The coolant temperature sensor switch is not working if the engine emits black smoke. The switch may have failed if the car gets poor fuel economy.
How to Replace a Manifold Temperature Sensor
Signs of a failing manifold temperature sensor include rough idling and a rough running engine, and may result in a failed emissions test.
How to Replace a Car Battery Temperature Sensor
The battery has a battery temperature sensor that can fail if the Check Engine Light comes on, the battery voltage is low, or the RPM curve surges.
How to Replace an Exhaust Gas Recirculation (EGR) Temperature Sensor
Exhaust gas recirculation (EGR) temperature sensors monitor the EGR cooler's operation. One is on the exhaust manifold and one is near the EGR valve.
How to Replace the Oil Temperature Sensor on Most Cars
Oil, as well as the oil temperature sensor, is crucial to the engine lubrication system. A bad sensor can lead to leaks and poor vehicle performance.
3 Essential Things to Know About Your Car’s Temperature Gauge
A car temperature gauge shows how hot the engine is. If the temperature gauge reads high, your car could be leaking coolant or have a bad water pump.

Related questions

Question
Why would my truck run better without the coolant temp sensor plugged in? 1990 Chevrolet K1500
Hello - coolant temperature sensors are variable resistor devices - the colder the coolant temperature, the greater the electrical resistance value reported to the engine computer. (The warmer the temperature, the less resistance.) An "open" condition, as in an incomplete...
Question
My JEEP GC is coolant temp is high and I changed the themorstat
Hello, thank you for writing in. While that is a little higher than we would like to see, it is not overwhelmingly hot for the engine. Once it hits 260, you must cut off power to the vehicle. Anything over...
Question
Where is the ambient air temperature sensor located on a 2016 impala LTZ?
There is more than one ambient temperature sensor on your vehicle. The engine air intake system has an ambient temperature sensor located in the air duct after the air filter. That sensor is part of the mass airflow sensor assembly....
Question
hard to back up when van gets hot okay when it's cold
Hello, thank you for writing in. The vehicle is likely having issues with the transmission fluid. If you have not had the transmission serviced, it is time to check the level and condition of the fluid and replace the filter....
Question
My Cadillac CTS displayed a message saying trans hot engine idle what could the cause of that be?
Check the transmission fluid and see if its low or too high. Low or too high transmission fluid will cause the transmission to overheat. The transmission temperature sensor will pick up this condition and keep the vehicle from going into...
Question
Temp going up and down and jerking while driving.
The issue seems to be the head gasket is burned on your vehicle. The coolant is getting into the cylinders and the combustion gases are getting into the cooling system. This would explain why the engine would jerk when driving...
Question
Temperature gauge problem on a 2005 Mercedes Benz S500
Hello - I would first check for problem codes, whether the Check Engine light is illuminated or not. And, if the engine is not really overheating, the problem is most likely the engine temperature sensor (the sensor for the gauge,...
Question
Coolant temperature gauge does not move at all. 1998 Ford Ranger
Hi there - most likely the coolant temperature sensor (for the gauge, not the coolant sensor that drives the fuel injection - there are usually two) is toast. This can be checked with an ohm meter. A reading of 2K...
Question
Cooling fan not coming on
The electric radiator cooling fans are powered through relays, a fuse, and a temperature switch. The fan motors themselves should be tested (the fan motors can be independently powered, on or off the car, to see if they work properly)...
Question
Problem with the coolant temperature gauge.
Hi there. The temperature gauge is not grounding out to the vehicle chassis. Try putting an additional wire on the housing of the temperature gauge and grounding it to the chassis. If this has no effect, then the gauge is...
Question
Van stalls when it gets warm, i wait a little while 15min to 20min it starts up, until it gets to warm and stalls again.
Check the ignition coil on your engine. If the coil in new with the distributor, then the problem could be the computer or module of the vehicle. An ECM or PCM will cause the ignition system to shut down if...
Question
My car misfires when it's cold al so idling rough
Hello, thank you for writing in. The vehicle may be having one of several issues including clogged fuel injectors, poor compression (metal expands when hot), any of your air intake sensors, or a vacuum leak. The valves and lifters can...
Question
My 2008 murano runs smooth, but shuts off after the temperature gauge reaches close to half
Hello, thank you for writing in. If the vehicle is not actually overheating, then the coolant temperature sensor may be failing. The car may be prematurely entering into a safety mode meant to keep your engine from destroying itself. Overheating...
Question
I rebuilt my 95 chevy 350. It has all new sensors, water pump, radiator, clutch fan assembly, and thermostat. The top hose is cold
First check to see that the cooling system is full of coolant. If the radiator is full, then check your thermostat to see if its installed upside down. If a thermostat is installed upside down, the coolant temperature will not...
Question
Fuel problem?? 1993 Chevrolet S10
Hi there - I'm thinking there are a couple of possibilities since you have identified what is clearly a ["running too rich"](https://www.yourmechanic.com/question/fuel-rich-smell-from-car situation. Leaking fuel injectors could cause this problem, high fuel pressure, or a faulty coolant temperature sensor signal...
Question
Transmission temperature sensor is acting up. Can it be changed?
Your vehicle should have an AODE / 4R70W transmission and the transmission temperature sensor is located on the Valve Body (brain) in the oil pan. Remove the transmission oil pan and drain out the oil. Remove the oil filter and...
Question
stalling engine
Hello there. Usually this type of issue is caused simply by clogged or dirty fuel injectors or the throttle body being dirty. When an engine gets warm it is more dependent upon the efficient flow of vaporized gasoline. When the...
Question
Why does my thermostat not read anything on dash board 1994 Dodge Ram
Hello. If the gauge does not move at all even when the vehicle is turned off and on then the gauge is bad. If the gauge cycles but then does not move when the vehicle is turned off and on...
Question
Where is my coolant going? My car keeps overheating and blowing cold air. The temperature rises when stopped and drops when accelerating.
Look everywhere around the engine and see if there is a split hose or loose hose clamp. If the hoses and clamps are in good shape and tight, then check the core plugs (freeze plugs) and see if there is...
Question
My temperature gauge does not work
You can take the temperature sender unit on the engine connector off and turn on the key to see if gauge moves up and down when wire is grounded on the engine block. If the gauge moves then you need...

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