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Temperature gauge on dash said HOT, engine kept losing power, not able to accelerate, turned off engine and found it to be cold.

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Bad engine coolant temp sensor a common problem

Posted on Apr 12, 2009

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Changed out water pump and thermostat and vehicle runs high temperature what could be issue?


Reasons the Temperature Gauge Reads High

If the temperature gauge reads high, it could mean your engine is overheating. Another reason your reading might be high is you could be losing coolant. A small leak or evaporation may cause your radiator to slowly lose coolant. A third reason your temperature gauge reads high could be because the thermostat is broken. If this is the case, you may need a coolant temperature switch replacement. The last reason the temperature gauge could read high is because of a water pump, or water pump gasket failure. If the water pump is malfunctioning, it may need to be replaced by a professional.

What to Do If Your Temperature Gauge is High

If your temperature gauge is reading high, it means your car is overheating. This is a very serious matter and you should never drive an overheating car. If your car starts to overheat, shut off the air conditioner and open the windows immediately. If this does not reduce the overheating, turn on the heater as high as it can go. If this still doesn't work, pull over on the side of the road, turn off the engine, open the hood carefully, and wait until the vehicle cools down. Never open the radiator cap while the engine is hot - coolant can spray and burn you. Once the vehicle has cooled, take the car to a mechanic right away so they can diagnose the problem. Cars are especially susceptible to overheating in hot climates, like what's common in cities like Los Angeles, Phoenix, Las Vegas, or Atlanta.
The temperature gauge is an important tool in your vehicle that shows the temperature of your engine's coolant. Contact YourMechanic and have your car inspected for overheating if it reads too high, as this can cause serious problems...

Reasons the Temperature Gauge Reads Cold

On most vehicles, the temperature gauge reads cold until the engine has run for a few minutes. If the temperature gauge still reads cold after the engine has warmed up, the gauge may simply be broken. Another reason the temperature gauge could read cold is if the thermostat in the vehicle stays open. With the thermostat stuck open, the engine can be overcooled, causing a low temperature reading. If this is the case, the thermostat may need to be replaced.

Oct 28, 2017 | Cars & Trucks

1 Answer

My car wont go in between the hot and cold meter


engine - Car temperature displaying below Cold or just ...

mechanics.stackexchange.com/.../car-temperature-displaying-below-cold...
Jun 25, 2012 - Today I was boiling inside my car as it was a very hot day and my ...cold, it almost never goes up to even 1/4 of the temperature gauge, the ... Where I live, it's hot enough that even with the thermostat wide open the engine won't stay at C.. ... How to Match Skin Color Between Pictures Of The Same Person In ...

What does it mean when my car's temperature gauge is halfway ...

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Aug 23, 2011 - I think my temperature gauge is usually all the way to the left, which I think is "cold" (okay). ... before steam poured from under the hood of my car and I had to pay $217 ... Why does my A/C stop blowing cold & my temperature gauge goes toHOT? ... But the battery won't keep a charge after sitting over night. my temp gauge always stays on cold. never moves.? ' Yahoo Answers
Mar 28, 2014
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Dec 01, 2015 | 2002 Acura RL 3.5

1 Answer

The temperature gauge goes up when car starts to HOT like its out of calibration. the engine is not overheating


check that the wire to the temp sender unit has not fallen off and is shorting out on the head/block. The power comes from the ignition switch through the gauge down to the sender unit and because the sender is a temperature controlled resistance unit the voltage is very low and so the gauge reads cold . as the temperature heats up , the resistance is decreased and so the voltage is increased though the gauge and the needle reads higher.. Hench if the gauge goes directly to hot on start up the wire is shorting out or the sender unit is faulty.

Mar 09, 2014 | Acura CL Cars & Trucks

1 Answer

Car accelerates itself


what year car, all are different, no year, no real help.

please do elaborate that
im doing what?
is this a problem parked, (in parking , implies you are stopping while driving?) what?
does this failure, happen, in PARK? (shift lever in park)
or is parking a verb, in that, im going to park but are attempting it.

questions.
is engine hot or cold, does it fail in hot or cold only or both.
the dash gauge shows, the engine temperature, a key fact.

are the floor mats hitting the gas pedal. like on most toyota's it seems?
are your feet, hitting the wrong pedals,
driving with snow ski boots?
if the fuel pedal is not sticking, then its a real problem.
for sure dont drive car... like this. if it is a real engine problem.

and yes, all cars can fail and do that.
just sticking throttle , and bingo.


Dec 27, 2013 | Jeep Cherokee Cars & Trucks

1 Answer

Temperature Gauge read HOT instantly


If the gauge does not go back to cold when the engine is cold, it could be the gauge on the dash. I am assuming the gas gauge drops with the key off.
You could unplug the temp sensor on the engine to see if it makes any difference.

Jan 31, 2013 | 2001 Ford Escort ZX2

2 Answers

Heat gauge goes way up,then by reeving motor it will go down.blows cold air


Check out related help links with solutions to troubleshoot the problem:---
Click the link below:---
2004 Toyota Tundra: Oil Gauge and Temp Gauge Not Working?


http://howtobyme.blogspot.in/2012/05/2004-toyota-tundra-oil-gauge-and-temp.html

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Toyota 4Runner: Temperature Gauge Sensor http://technoanswers.blogspot.in/2012/04/toyota-4runner-temperature-gauge-sensor.html

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Temperature gauge sits over half way mark? http://schematicsdiagram.blogspot.in/2012/04/temperature-gauge-sits-over-half-way.html
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Heater blows intermittently and temp gauge goes erratic?


http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html
------------- No heat on Oldsmobile Silhouette? http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html
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Temperature gauge does not move and no heat when heater is ON? http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html
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Temperature gauge keeps fluctuating up and down close to red? http://technoanswers.blogspot.com/2012/01/temperature-gauge-keeps-fluctuating-up.html
----------- Temperature gauge on the dash quit working on Pontiac Grand Prix? http://technoanswers.blogspot.com/2012/01/temperature-gauge-on-dash-quit-working.html
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Dodge neon gauges not working? http://technoanswers.blogspot.in/2012/02/dodge-neon-gauges-not-working.html

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Heater blows cold? http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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Heat blows cold on drivers side and hot on passenger side? http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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1992 Lexus LS400: Engine overheats, Antifreeze out of reservoir and heater Blows Cold Air? http://whatisbyme.blogspot.in/2012/05/1992-lexus-ls400-engine-overheats.html

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These details will help.
Thanks.

Nov 22, 2012 | 1997 Ford Taurus

1 Answer

2000 malibu runs hot if not warmed up


How do you know it gets hot? Are you going by the temperature gauge on the dash? Or have you checked under the hood and found out the engine really is running hot? ...Reason I ask is, something just doesn't sound right in your description. After just 5 minutes from starting and driving away, the engine would not yet be at normal operating temperature. That would explain the heater not yet warm. But the temp. gauge says hot?
If so, I would replace the temperature sending unit on the engine. the one for the dash gauge, and see if that was the problem-not reading the temp. accurately.
Couple of other things: Are you sure you got all the air out of the coolant system? Start the car with the radiator cap off and let it run until the engine is warmed up fully, then shut it off and install the cap. Does your reservoir tank stay about half full where it should be, between the full-hot and full-cold marks?
If your problem persists. I would have the coolant system pressure tested, and see if you could get a true temperature reading of the coolant when it seems to be running hot.
Good luck.

Mar 05, 2012 | Cars & Trucks

1 Answer

2002 Ford F250 Super Duty miss firing when cold


Check your intake gaskets by spraying a water mist from an old spray bottle on them when the engine is running. Sometimes heat will expand the gaskets and seal them. When you find the leak, the engine RPM will change or the engine will stall.

Sparkplugs will do this when they are going bad. So will glowplugs on Diesel engines.

Also have your Battery checked. If the battery is weak, you will start at a low voltage and then as the Alternator catches up, the engine will get smoother when electric power is restored. The controls on your engine work off of Voltage readings so some controls will automatically set up controls bercause of the wrong Voltage for the condition.

Cold start circuit. Your engine will step up the idle and enrichen the fuel mix when a temperature sensor tells the controls that the engine is cold. There can be 2 temperature sensors and you want to check the sensor that operates the engine, not the dash gauge. You can tell which is the dash gauge by unplugging the sensor after the engine has warmed up(Running). When you lose your dash gauge, then you know that the other sensor is the one you want.

Jan 27, 2012 | 2002 Ford F250 Super Duty SuperCab

1 Answer

Went to autozone cause my check engine light came on. got a code of p0117 changed out the temperature sensor. engine light went off. an hour later the light came back on. noise kept coming from under the...


Check the connectors at the PCM or ECU; lose ones could cause this problem. Something else to consider is to get the sensor from the dealership; many of these sensors are very sensitive and aftermarket ones tend to not be calibrated correctly.

Jul 25, 2011 | Pontiac Vibe Cars & Trucks

1 Answer

Fluctuating engine temp a/c sends out cold air intermittently


Here's the thing. The ECU will shut down AC if the engine temperature is too hot. If the coolant temperature sensor is malfunctioning (lying to the ECU) telling it that the temperature is hotter than it actually is, the computer will turn the AC OFF.

Sep 11, 2009 | Hyundai Motor 2003 Elantra

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