Coolant light comes on but there is no leak but coolant is gone

The red coolant light coming on and the vehicle going into limp mode is typically an indication of a problem with the engine's coolant system. This could be caused by a number of things, such as a low coolant level, a malfunctioning coolant sensor, a leaking radiator, a faulty water pump, or a problem with the vehicle's engine control system. It's also possible that the problem could be caused by a malfunctioning sensor, such as a coolant temperature sensor, that is not being picked up by the diagnostic tool. It's best to have a mechanic diagnose the issue to determine the cause and make any necessary repairs.

Might be the water pump! Take it back and tell them they need to do it right.

There is a compression tester for the radiator. It is a special cap that fits on and you pump it up. This will allow you to look for the leak with the engine cold and not running.

Probably the water pump. You should see coolant coming from the vent hole on the pump--usually on the bottom.

There is a leak in your cooling system. Take it to the dealer or mechanic; it needs to be replaced.


Adding coolant would probably prevent it from overheating, since it sounds like you could be leaking coolant. But you will want to get it fixed immediately. Wouldn't want to be stuck in traffic while you have a cooling system leak, only for the engine to overheat and having to buy another engine.

You could possibly have a leaky or blown head gasket. Do you notice any smoke or steam coming from the exhaust? Also check your oil and make sure its clean or black. If its milky brown then the coolant could be going into the engine.

you never want the temperature guage at the red, at this time usually something major becomes damaged. Check your coolant level, if low inspect hoses, radiator, waterpump for leaks.

Easy way to tell if the intake is leaking internally would be to check the oil level because typically if it is leaking it runs through the engine and down into the oil pan.If the oil level is higher then normal then the intake gaskets leaking is a good possibilty. Another suggestion is checking the color of the exhaust coming out the tail pipe.Normal exhaust is white/grayish color and not normally thick and coolant escaping out the exhaust is typically a heavy white smoke.In addition that kind of exhaust would indicate a head gasket leaking. If you don't see thick white exhaust but the oil level is high the intake is probably leaking again.

could be the unit in the header tank that has gone open circuit,try a new one they arent expensive

thermostat gone bad