Antifreeze in reservoir is black in color what cause this?

You can open up the hood of the car and find the coolant reservoir. This can be whitish color or translucent. Loosen the cap up to a small extent, let the built-up pressure release, then remove the cap completely. Pore the antifreeze mix until it reaches the cold fill line on the vehicle's reservoir level.

You have a blown head gasket or a cracked head..more than likely just a blown head gasket..you need to have someone run a combustion gas test on the radiator..you are getting raw exhaust pushed back in to the radiator causing it to superheat

The flashing light means there is a problem with the engine serious enough to damage the catalytic converter. You should get the computer scanned for trouble codes.
If there are no external coolant leaks, the engine is probably burning the coolant thru the cylinders and out the tail pipe. Which could also be causing the flashing light.

When it is cool, take the cap off the radiator. See if you can see antifreeze. If you cannot, pour it directly into the radiator.

thermostat?

Your owners manual should have diagram of radiator and coolant reservoir. If not call your local Chevy or Daewoo dealer (Daewoo makes the Matiz for Chevy)

Check all around the intake manifold gasket for evidence of antifreeze. Also check your oil for evidence of coolant. The Dexcool antifreeze used in GM engines can cause the intake gaskets to deteriorate causing coolant leakage. Very difficult to detect.

you need to find that leak, is the leak visible? if its not from radiator or the reservoir, the only other place I could think you can lose water is the head gasket. It happens to high miles and hard driver. 100k miles would likely be a head gasket. Leaking head gasket will also cause the engine temperature to rise and run super hot. antifreeze will leak through the head gasket down to your oil pan mixing oil and water. Check your oil by pulling the dip stick and see if you have oil mix with water; it will have a slimy looking colors, oil is light color and it should never be black. if it black than change your oil and inspect it afterward when the car has been running for while. when engine really hot cause the heat to effect the starter not to engage or start or engine is too hot to run. repairing head gasket could run anywere from 500-800 bucks.

Hi, there should be a white plastic reservoir with a black lid that just pops off,just follow the smaller black hose from the radiator to it. ( i don't remember if its on the left side or the right side on that year ) there is only 2 reservoirs under the hood and one is for wiper fluid and the other is for the antifreeze. also the top of the lids will say in writing on top which is for which. ps. Also you want to add antifreeze with engine running because if the system is low,once the engine reaches normal operating temperature it will **** the coolant from reservoir to engine/radiator and you might need to add more coolant to reservoir. yz-maniac.

open the reservoir when cold refill with prestone dont drive with empty reservoir it might overheat and cause aditionnel problem hope its a fix fpr our problem and fixya for my rating thank you pierre