if there are no signs of leaks on the ground, gm is known for leaky head gaskets. i have the problem on my 03 grand am gt. look around the plenum or intake manifold and you should see signs of antifreeze burn-off or small accumulation puddles in the crevices of the block or cylinder heads. or check your oil and see if it looks like a "strawberry shake" color, if yes then it's leaking into your oil passages...not good!!!! your engine may stall due to lack of lubrication meaning EXPENSIVE REPAIR! hope this helps or gives you ideas of what to look for.
in the radiator reservoir
Regular antifreeze such as, green, or red!
green
antifreeze coming from back of intake on 1993 gmc sierra
My 08 sierra had this same message. It wasn't hot and the antifreeze reservoir was full. The thermostat wasn't reading correctly. We had that replaced and so far so good.
One common cause is when you need antifreeze fluid for your radiator. Often times, the liquid becomes completely used and that is when your engine heats up, which could further result in a cracked radiator.
after removing the reservoir gently pry out the old pump and lube the o-ring for the new one with lite oil
in some cases the antifreeze will change consistency, it would turn into a "muddy" like substance. As long as the antifreeze you are using is ethylene glycol based, as most are,(Prestone, Peak, Zerex, private label brands) EXCEPT the Sierra brand, they are totally compatible. If your cooling system has any darkness to it that indicates it is time for a cooling system flush.
I use Sierra at 50-50%. It's environmentally friendly, i.e: non-toxic.
Landforms are: * Escambray Mountains * Sierra Maestra ~ Pico Turquino 6,560 ft * Sierra Cristal * Sierra del Rosario * Sierra de Trinidad * Sierra de los Organos Bodies of water are * Cauto River * Laguna de Leche * Zapata Swamp * Zaza Reservoir * Atlantic Ocean * Caribbean Sea * Gulf of Mexico
Dex cool, they make some that you can use in either but GM is supposed to use the orange Dex cool
These 2003 new fangled contraptions. Radiator caps are a thing of the past. Now we have radiator reservoir caps. Neat...