2000 Jaguar XK Logo
Posted on Jul 01, 2008
Answered by a Fixya Expert

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Engine coolant low

Hi Folks,
My dashboard display is showing 'engine coolant low' intermittently despite the fact that I topped it off with water two weeks ago. When I attempt to clear the error, the red LED remains on. Temp indicator on the dash has remained at mid point over the two weeks, no problems with over heating.
Is the engine coolant water only? Also is it fed from form the pipe inlet under the hood just below the wipers only?
Am totally paranoid about it now and am reluctant to drive it in case I do damage.Would REALLY REALLY appreciate any advice you can provide
Rgds, Gavin

  • GavinDelaney Jul 01, 2008

    Hi D,



    Appreciate the prompt response. I will check the terminals on the level switch as u suggested. I am 100% sure about where the coolant goes in the cooling circuit under the hood but i just wanted to be sure that this is the only access point for it as the damn LED remains on.



    Anyhow, thanks again mate

  • Larry David Sep 13, 2008

    Hi everyone,



    It seems like I am experiencing a similar problem to you.



    I was wondering if I could get someone's advice to the problem I am now have. I own a Jaguar XK8 Coupe '03 and I switched on the engine this morning (fairly normal weather conditions) only to see "Engine Coolant Low" appearing on the dashboard. The temperature gauge on the right was as normal, in the middle and the engine sounded fine. I switched it off for ten minutes and started the engine again. This time there was no message and the gauge was normal. However, I have noticed that on the Engine Coolant temperature gauge red segment light at the top is constantly on. I have topped up the coolant with some water and hear no noises at all and smell nothing.



    Can anyone help / advise how serious this could be? In your experience, do I need to talk to my bank manager to get this fixed, or is it a relatively simple hose replacement?



    I appreciate any help and thanks in advance.



    Cheers,



    Paul



    [email protected]

×

1 Answer

Richard Raynor

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  • Expert 225 Answers
  • Posted on Jul 01, 2008
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Hi Gavin,
I'm no expert on Jaguars, but if there is a "low coolant" warning light when there isn't "low coolant" it may be that the level sensor has got poor electrical connections, possibly due to corroded or dirty terminals, or the sensor may be faulty. If there is a removable electrical connector on the container where you add coolant, that might need checking.

The cooling system should be a mixture of water and "antifreeze / summer coolant". I don't know where you live but the car manual will tell you the correct mixture to use. The stuff you add to the water contains corrosion inhibitors and other chemicals to make the engine last longer.

But there will be several different liquid containers and filling points under the hood and you mustn't get them mixed up!

Coolant expansion tank - where you top up coolant
Windscreen washer liquid tank
Engine oil filler
Brake fluid / hydraulic systems reservoir
and maybe others too.
These should all be clearly identified in the users manual - well worth a read.

If these suggestions do help you solve the problem, please give my reply a rating to help others judge my knowledge / guessing skills.
If they do not, please add a comment with more details so I can try to help you further.
Cheers, D

  • Richard Raynor Jul 01, 2008

    Thanks for your reply, and I hope you find the cause of your problem easily. D.

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1 Related Answer

Anonymous

  • 323 Answers
  • Posted on May 23, 2009

SOURCE: Engine coolant low

All autos should run a coolant mixture of 50% water, 50% anti-freeze. BMW in particular have their own formulation of anti-freeze they highly recommend you use instead of any other brand.

If your temp gauge is at mid point on a BMW it is a little high. Could be that you have too much water in the mixture and it isn't cooling properly. There is an over flow (usually plastic) which runs out of the radiator. It is here that you replentish coolant. NOT in the radiator.

At this point I'd be more concerned with where that coolant is going. I don't have to add water to my Beemer more than once a year.

Maybe you have a bad temperature sensor. Maybe a bad thermostat. At any rate, at this point I'd bite the bullet and go see the man at the BMW shop.

Better safe than sorry.

Sirwriter

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Are there 2 coolant temp sensors on a 1996 Buick Century 3.1?

No , their arn't two coolant temp. sensors . One near the thermostat housing . The Temp sensor is a input to the PCM / ECM . The PCM / ECM needs the temp info for fuel calculations . The temp gauge on the instrument cluster gets this info over class 2 serial data network Hooking up a factory or professional scan tool that can read sensor data is the easy way to diagnose ,not guessing . Looking at factory service info. an wiring diagrams too see what is what is another way . You have no clue ,take it to a qualified repair shop.

The engine coolant temperature sensor is a thermistor (a resistor which changes value based on temperature) mounted in the engine coolant stream. Low coolant temperature produces a high resistance (100,000 ohms at -40°C/-40°F) while high temperature causes low resistance (70 ohms at 130°C/266°F).
The PCM supplies a 5 volt signal to the engine coolant temperature sensor through a resistor in the PCM and measures the voltage. The voltage will be high when the engine is cold, and low when the engine is hot. By measuring the voltage, the PCM calculates the engine coolant temperature. Engine coolant temperature affects most systems the PCM controls.
The scan tool displays engine coolant temperature in degrees. After engine startup, the temperature should rise steadily to about 90°C (194°F) then stabilize when thermostat opens. If the engine has not been run for several hours (overnight), the engine coolant temperature and intake air temperature displays should be close to each other. A hard fault in the engine coolant sensor circuit should set DTC P0117 or DTC P0118; an intermittent fault should set a DTC P1114 or P1115. The DTC Diagnostic Aids also contains a chart to check for sensor resistance values relative to temperature.
The ECT sensor also contains another circuit which is used to operate the engine coolant temperature gauge located in the instrument panel.
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No DTC definition code found p1114

Hi there:
DTC P1114 - Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage/IAT - B Circuit Low Input



The engine coolant temperature sensor is a thermistor (a resistor which changes value based on temperature) mounted in the engine coolant passage. Low coolant temperature produces a high resistance 100,000 ohms at -40 oC (-40 oF) while high temperature causes low resistance 70 ohms at 130 oC (266 oF).

OPERATION
The VCM supplies a 5 volt signal to the engine coolant temperature sensor through a resistor in the VCM and measures the voltage. The voltage will be high when the engine is cold. The voltage will be low when the engine is hot. By measuring the voltage, the VCM calculates the engine coolant temperature. Engine coolant temperature affects most systems the VCM controls.

The scan tool displays engine coolant temperature in degrees. After engine start-up, the temperature should rise steadily to about 9O oC (194 oF) then stabilize when thermostat opens. If the engine has not been run for several hours (overnight), the engine coolant temperature and intake air temperature displays should be close to each other. When the VCM detects a malfunction in the Engine Coolant Temperature (ECT) sensor circuit, the following Diagnostic Trouble Code (DTC) s will set.



Hope this helps.
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1996LINCOLN MACH III LOW COOLANT MESSAGE AND OVER HEAT x2

Sounds like sticking thermostat. Replace thermostat if you see no leaks anywhere else.
You need to drain out any bad coolant or water when you replace thermostat and refill with concentrated antifreeze until you have at least 50% antifreeze water ratio.
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Intermittent heat

Hi BSM,

Intermittent heat is usually the result of a low coolant state. What happens is the heater core isn't getting the circulation necessary to keep the air warm. The irony is that your engine will run hotter when this happens.

To fix this, start with a cold engine and open the radiator fill cap.
Start the engine and top off the coolant.
Let the engine keep running and warm up.
When it begins to cycle the coolant check the level again. Top it off again.
Turn the heater on full blast
Keep topping after each cycle until it stops needing fluid.

At that time the heater should be blowing hot air consistently.

Best regards
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Engine coolant low

All autos should run a coolant mixture of 50% water, 50% anti-freeze. BMW in particular have their own formulation of anti-freeze they highly recommend you use instead of any other brand.

If your temp gauge is at mid point on a BMW it is a little high. Could be that you have too much water in the mixture and it isn't cooling properly. There is an over flow (usually plastic) which runs out of the radiator. It is here that you replentish coolant. NOT in the radiator.

At this point I'd be more concerned with where that coolant is going. I don't have to add water to my Beemer more than once a year.

Maybe you have a bad temperature sensor. Maybe a bad thermostat. At any rate, at this point I'd bite the bullet and go see the man at the BMW shop.

Better safe than sorry.

Sirwriter
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Thermostat?

It actually sounds to me like you're low on coolant. My Jeep leaks coolant and whenever it gets low the temp gauge will go real high and then drop, and the heater doesn't work well. This is because the cooling system of your car is supposed to be a closed system, full of coolant and no air. When coolant leaks out, the space it used to occupy is now occupied by air, which does not transfer heat well. When 'air' is passing through your cooling system, no heat can be transferred from your engine to the heater and radiator, resulting in a hot engine and no heat at the heater. Then when a pocket of water passes through the system, the temperature gauge quickly falls as the water absorbs the heat from the engine. The hot water that cools the engine is where the heater gets it's heat from as well, so when water passes through the heater core, the heater works, but when it's filled with air, it doesn't.

Hot water runs through the heater core regardless of whether or not your thermostat is open or closed. That's why your heater works in the winter even before the engine is at normal operating temperature. The fact that the heater stops working is a good sign that the thermostat is probably not the culprit.

As for the water pump. If the water pump was bad, your temp gauge would go into the red and stay there. Water pumps generally don't work intermittently. Either it's good and ot works, or it's bad and it doesn't.

However, if you are in fact low on water, as I suspect, it means you probably have a leak somewhere. The leak could be in the water pump housing gasket, so depending on where you take it for repairs, they may try to sell you a new water pump anyhow. So just beware of that.
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Flashing graphic on dashboard

If it shows flashing water spout, it's got to be the coolant, check for low coolant, or if it's over heating'
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