Originally Posted by xr6t
Hmm, ok riddle me this, is it referring to the level being low by way of depth or the level being low by way of coolant content within the water. Last I checked it was just water and not much coolant but the levels were fine.
Ahh, that explains dellboys reference to the temp sensor, now I see how it works together.
Thanks again, will investigate further.
Low as in depth in the bottle.
As someone explained earlier if the float no longer 'floats' the sensor thinks the level is low.
The last couple of coolant level sensors I've pulled out of bottles have been stuck in one position.
The car owners were both bad bad boys and didn't think coolant was worth buying, they figured water is a lot cheaper.
There's a magnetic switch inside the sealed bit that inserts into the bottle (there's no direct connection to the float, just two magnets working on proximity to trigger a switch).
The magnets attract fine metal particles that are floating around in the cooling system, rust up and can jam the float.
Pull it out, clean it, and it works fine again.
That fixes the float but it's a 'resulting' problem.. you should look for the original cause.
I'd suggest if you've only got water in your cooling system and no coolant you're being bad too!
You're not pampering your car as Ford and the coolant manufacturers intended and your engine and radiator are on an accelerated destruction course.
That may be the reason your coolant level float has stuck.
Seriously, there's too many different metals in modern engines (Including steel pipes) to get away with just water nowadays.