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Coolant light what needs to be done if the coolant light comes on

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Denis Aube

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First check the coolant expansion tank and radiator for correct level. The radiator should be full (take the cap off when the engine is cold, doing this on a hot engine will cause hot coolant to spray out and possibly cause major burns). The expansion tank should be marked level-wise, either min-max, or min only, or max only. If the levels are right, your level sensor is probably bad. This sensor is located somewhere in the expansion tank.

Posted on Aug 17, 2008


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1998 Pontiac Sunfire has a low coolant light on I changed the sensor thermostat and flushed the system including bleeding the light is still on and has no leaks and the reservoir tank is full what's...

low coolant sensors work by the fact that they need to be completely covered by water. There is current to the sender that earths out through the coolant to the engine and back to the battery earth wire.. This circuit hols a relay open so that no lights come on. When the circuit is broken ( low water --broken wire) the relay clicks in and the lights come on to let you know that there is no coolant in the system before there is damage done to the engine. So check that there is coolant. in the radiator right up to the cap ( not some in the radiator) and check that the wire is not broken at the sensor.. You may not have bled all the air out of the system (air lock) and this is affecting the sensor because there is not always water around it.

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Coolant light comes on what is the danger

The danger of ignoring the coolant light is a wrecked motor from over heating. To eliminate all the possibilities. Check coolant level at the radiator --not the reservoir. Have a coolant system pressure test done to determine leaks. Have a compression test done to check for head gasket or cracked head. Check correct operation of cooling fans . All these checks will not cost much but will save big money in the long run

Sep 23, 2013 | Cars & Trucks

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2000 Pontiac Sunfire GT 2.4L Low coolant light on, even with coolant reservoir full, car is overheating.

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If the engine stops running hot, try a 180 degree instead of the 195.
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I have a warning light that came on today, looks like an engine but is lit solid not flashing, I checked the fuel cap and it is fine, should I stop driving it?

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'service engine soon' light comes on one day, then is off the next--no pattern-- no intake or liquid leaks found by mechanics?? Also, 'low coolant' light comes on now and then, no leaks found; not even...

The low coolant light could be caused by trapped air in the cooling system. If the mechanic didn't doa diagnostic scan, that needs to be done. Even though the service eng. light didn't stay on continuously, there could be stored codes in the computer.

Jan 11, 2011 | GMC Yukon Cars & Trucks

1 Answer

Coolant light comes on

Ouch. Been down that road.

Sounds to me like a head gasket problem.

Pull your oil dipstick.

Is your oil watery?

Does your dipstick smell like coolant?

Does your coolant have an oily film on it?

You can have a dye leak test done to confirm it.

Should you be able just to have the head gaskets changed and not the engine, again..insist on thenewest, brand name, top of the line gaskets

Best of luck.

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1 Answer

Low coolant light

When that happens it is usually because the coolant level membrane sensor is faulty.

Repair is not expensive, but must be done by a qualified mechanic.


May 20, 2009 | 2002 Mercury Sable

1 Answer

Coolant light on an AUDI TT 2000

It sounds like it is low on coolant. Coolant expands when it warms up so if it is just low enough to trip the switch when it is cold it will shut the light off when it warms up. You should be ok to just top it off but be sure that what you put in is compatible with what is in it. There must also be a leak somewhere in the system for you to have lost some to begin with. Depending on how many miles you have on the car it wouldn't hurt to have the cooling system flushed if it's never been done before. If you do get it flushed take it to the dealer to have it done. Explain to them the low coolant and have them check the system for leaks at the same time. Hope this helps

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1 Answer

Engine light is on.

When the check engine light comes on the dash, the computer stores a trouble code(DTC). The computer would need to be scanned to get the code. This code will indicate what system is having a problem. Many of the large parts store chains will do this for free.

A coolant leak can be from any nunmber of sources. A pressure test would need to be done.

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Flashing Coolant light + 1

Draining coolant is very very easy...........first you're going to want to let the car cool down for a few are going to need a plastic drain pan, pliers, flat head screw driver, probably some rags also.....and obviously coolant. First take off the coolant resevoir cap....There are two bolts that your going to want to loosen bolt is on the bottom end of the block and the other is on the bottom passenger side of the radiator. For the bolt on the radiator you way need pliers to loosen the wing nut...when you remove this it is going to come out pretty fast...slide the drain pan underneath the radiator and block and wait till it is done draining. Then put the bolt back on the block......get a garden hose and let it run water through your radiator until the water coming out of the bottom is clear.... after that put the bolt back in on the radiator and fill the system up with a 50/50 mix of coolant and water..... if this is still confusing go to your local auto parts store......and purchase a haynes will walk you through step by step..........since the coolant is milky i would be led to believe that the coolant wasnt changed after replacing the head gasket......or the head gasket wasnt really changed......a good way to tell is if you notice white smoke even after the engine is hot coming from the far as the light it could be that you are low on coolant and i have seen that sensors also went bad......but definately change the coolant.....also check your oil to make sure there is no coolant in the oil ......hope this helps

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