Coolant low switch
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![Default](/forum/images/icons/icon1.gif)
Might be some air trapped in the system. You can "burp" it by hand to speed the process using the top radiator hose with the cap off the expansion tank.
If that seems to help, there is a bleeder cap on the thermostat tower to get it all out. Just be careful, the plastic can be fragile.
You can manually lift the float arm inside the expansion tank. It is over in the rear corner of the tank toward the center of the engine bay. Lift it up gently with a long screwdriver or rod to see if the light goes out. The floats go bad and the arms like to stick. Do a search, lots of threads on this problem.
There is a sensor that mounts on the bottom of the tank. Check the connection.
Lastly, or maybe first, is there enough coolant? It should be filled to just the bottom of the expansion tank opening.
If that seems to help, there is a bleeder cap on the thermostat tower to get it all out. Just be careful, the plastic can be fragile.
You can manually lift the float arm inside the expansion tank. It is over in the rear corner of the tank toward the center of the engine bay. Lift it up gently with a long screwdriver or rod to see if the light goes out. The floats go bad and the arms like to stick. Do a search, lots of threads on this problem.
There is a sensor that mounts on the bottom of the tank. Check the connection.
Lastly, or maybe first, is there enough coolant? It should be filled to just the bottom of the expansion tank opening.
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![Default](/forum/images/icons/icon1.gif)
Remove the thermostat tower cap and reservoir cap and squeeze the large upper radiator hose . . . cold . . . not running. Top up with coolant.
Some respected techs recommend clipping the 'giggle' valve off the thermostat which will more quickly allow air to escape which ends up in the reservoir.
The magnetic float fails or at least causes a lot more problems than the reed relay sensor mounted on the bottom of the tank. The sensor is also very fragile and should not be removed without removing the tank so that you can carefully pry it out. The last OEM tank purchased, of 5 on a couple cars, from Jaguar had a sealant semi permanently attaching the sensor to the tank.
Some respected techs recommend clipping the 'giggle' valve off the thermostat which will more quickly allow air to escape which ends up in the reservoir.
The magnetic float fails or at least causes a lot more problems than the reed relay sensor mounted on the bottom of the tank. The sensor is also very fragile and should not be removed without removing the tank so that you can carefully pry it out. The last OEM tank purchased, of 5 on a couple cars, from Jaguar had a sealant semi permanently attaching the sensor to the tank.
Last edited by test point; 03-13-2014 at 06:29 PM.
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