Low Coolant Light
Thread Starter
Drifting
Joined: Oct 2003
Posts: 1,349
Likes: 18
From: Dallas Texas
Low Coolant Light
HI
changed out my water pump and refilled the system - the low coolant light will not go out - it appears that it is full naturally - is there a way to reset this light ?
Thanks
changed out my water pump and refilled the system - the low coolant light will not go out - it appears that it is full naturally - is there a way to reset this light ?
Thanks
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
With the engine off, if you fill your cooling system to the neck of the filler, it will not be full and your low coolant light will come on when the engine gets to the opening temperature of the thermostat. C4's have the radiator higher than the engine block which traps air in the block. You need to, "burp", your cooling system. Here's how: starting from a cold engine, loosen the radiator cap to its stop point, start the engine and let it warm to the opening temperature of your thermostat. By pulling on the throttle cable, race the engine slightly and push in and turn to remove the radiator cap and observe that the coolant is flowing out of the upper hose due to the open thermostat. If there is air in your cooling system your coolant level will drop dramatically when your race the engine. While still holding the throttle open slightly, pour your antifreeze mix into the filler until it comes up to the neck of the filler and replace the radiator cap and then let the engine back down to idle. Sometimes you have to burp it more than once to get all the air out. REMEMBER, do not open the radiator cap if the engine is hot, always start cold so the coolant doesn't boil when the pressure is released and shoot out of the filler and scald you!!!!!
Race Director
Joined: Jul 2004
Posts: 16,795
Likes: 62
From: Lake Havasu City, AZ
If the above procedures don't work, then consider that the low coolant sensor located just below the rad fill cap on the engine side of the rad, may be gunked up or shot.
If it has been a long time since the coolant was changed and it lost its anti-oxidant properites, the sesnor surface can get oxidized and erroneously signal low coolant. If that is the case it neds to be replaced.
If it has been a long time since the coolant was changed and it lost its anti-oxidant properites, the sesnor surface can get oxidized and erroneously signal low coolant. If that is the case it neds to be replaced.
