Ive been monitoring the float level in the expansion tank and it remains at the same position, so, there is no need to add more fluid. Never appears when the car is first started. So all I can recommend is check the radiator for a sensor with an electrical connector. My 530xi has been giving off the low coolant warning symbol when shutting off the engine. The factory manual indicates the sensor is on the radiator in one part of the trouble shooting instructions and on the surge tank later on in the instructions :confuzeld. If no open circuit is found, replace the module.If an open circuit is found, repair it.Check for an open circuit between the sensor and If the lamp remains illuminated, connect the.If the lamp does not illuminate, replace the sensor.Sensor on the surge tank and use a jumper wire Disconnect the electrical lead at the coolant level If the lamp remains illuminated, go to step 2.The module for a short circuit to ground. If the lamp fails to illuminate, check the wiringīetween the coolant level sensor connector and.Turn the ignition switch to the "ON" position andĭisconnect the electrical lead at the coolant level Module connector, as well as the connector on theĢ. Socket, and wiring between the socket and the If the lamp does not illuminate, check the bulb,.If the lamp illuminates, the lamp is OK and theĬonnector is properly installed on the module.Turn the ignition switch to the "ON" position. Chevrolet has issued a service bulletin saying that this is a pr read more. Ive driven the car for quite awhile before this developed. I have a 2001 chevy impala with a low coolant light that will not go out. The coolant level indicator circuit is shown in figure 7.ġ. Engine temperature doesnt change and coolant reservoir remains full. (Unfortunately we do not have a 1993 manual in the FAQs): Where else could the coolant level sensor be located? Or am I totally missing something?Ĭlick to expand.This is from the 1994 C/K Truck Manual regarding the Coolant Level Indicator. NOTE: I did not see anything resembling a sensor ON or IN the reservoir - it was just plastic - no wires or anything else other than the cap itself. Hopefully, that was the issue and now the problem is solved. I disconnected the line from the radiator, sprayed it out, cleaned up the reservoir, reattached it, and no warning light so far. Then I noticed that the line I disconnected had quite a bit of copper build-up in it, to the point where it looked clogged, or at least mostly clogged. It appears someone tried to plug holes in the system using copper at some point and it was caked all over the reservoir. I disconnected the hose from the reservoir and emptied the nasty coolant into a bucket. We recommend allowing your mechanic to replace the sensor as it could require removing the coolant tank. This may seem like a DIY job, but it is actually a very complex repair to tackle. So I disconnected the 2 bolts and it had a plastic "fin" on the back of it that slid out of a metal holder attached to the firewall. When the low coolant sensor goes bad you could have a perfectly operable tank and no leaks, just a bad sensor or light that will illuminate due to a bad reading. It also had about twice the coolant in it than it should have. If you have fixed this problem already, let me know what/how you did it.OK - so I inspected the reservoir and it looked nasty inside. There may be an electrical issue with the sensor causing it to trigger the warning message. You must first inspect the coolant level sensor if your BMW has one. It is possible to get a Coolant Level too Low warning even if you add coolant. When the magnetic float works properly, it should float to the coolant level in which case you should not see the low coolant warning light on.Īt any rate, I am about to purchase a new expansion tank, since the magnetic float is shut in my expansion tank. The coolant level is full, but I still get a low coolant warning light. So, my sensor thinks that my coolant level is low. In my case, this magnetic float no longer floats any more and currently sits on the bottom of the expansion tank. The coolant level is fine and im not loosing any coolant. If the sensor probe is brittle and damaged, you will most likely need a new sensor.Ģ) Inside the expansion tank, there is a magnetic float that works with your sensor unit to send a signal if you have enough coolant in the expansion tank. Ive replaced the coolant reservoir w/ new sensor twice now but my low coolant light is still on. Lift up expansion tank to expose the sensor units (one on the left side is coolant level sensor) and remove the sensor for close inspection. Thininking that I had a defective coolant level sensor, bought a brand-new one, replaced it, but I still have the low coolant light on.īased on what I've learned so far, I have 2 advices for you:ġ) You might have a defective coolant level sensor. I have exactly the same problem with my 1996 850 Turbo.
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