3/13/2024 0 Comments Coolant light![]() No significant moisture under the car after being parked overnight. When I start the car, the light is off, but after driving it starts going on and off again. When I spoke to the dealer prior to topping off coolant, he said that with the two repairs, there may be air bubbles confusing the sensors. On the 10 mile commute to work this morning (mostly highway), the light lit up then went off 3 or 4 times, on for 30 sec to a few minutes at a time.Įngine temp is normal. Now, the coolant light is being very sporadic. You check the level when cold and it is normal, then drive it for 5-10 minutes and the low coolant light comes on (when the thermostat opens). Expansion tank was replaced, drove it home.Ĭoolant light came on again, I topped off the coolant with 50/50 OEM/water (on 6/21). The intermittant low coolant light is very common, especially when you have recently worked on the cooling system and lost some coolant, then refilled. Drove it off the lot, and started loosing coolant, took it back and what a surprise, the expansion tank had to be replaced. ![]() Went to the dealer (on 6/19) and they replaced the thermostat. A week ago the "Service Engine Soon" light lit up. If it DOES, your Switch is NOT the issue.Here's the situation, I drive a 2002 330Ci, 135k miles. Most likely area or wiring issue is at the connector.Īlternatively, you could drive with the Connector X112 DIS-connected, as long as you are SURE you have normal coolant level and no leaks, and see if warning light intermittently lights. Blue light from the coolant indicator shows that the coolant levels are low due to leaks or extended usage, while blue light from the high beam indicator shows that the high beam headlights are on. The Coolant Level Switch is difficult to get to, at the Bottom-Rear of the reservoir, and protected from Exhaust Manifold heat by a shield, so use care (perhaps removal of shield - 3 nuts) in removing. Presumably NO warning light is "At Rest" or Normal position. Note that the three switches shown in schematic (coolant level, washer fluid level, and Handbrake) are ALL shown in "Open Contacts" position. I recently did some cooling system repairs and had a constant Low Coolant Light. If the light comes on, then either the switch is failing or the level of the coolant has dropped enough that the switch sees the low level and reports it. The coolant, also known as antifreeze, plays a crucial role in maintaining the engine's temperature and preventing it from overheating. As the coolant level drips, the float sinks and the reed switch reacts by turning the light on. The above is based solely on interpretation of the TIS wiring diagram, and the "convention" that switches are shown in "at rest" or usual positions. When the coolant warning light is on in your car, it typically indicates that the engine's coolant level is low or there may be an issue with the cooling system. ![]() You could test the wiring by disconnecting the connector and noting if the Warning Light comes on when: (a) the wiring harness is gently manipulated or moved, (b) the two sockets of the connector are "bridged" or connected with a test wire, or (c) light flashes when harness moved with sockets bridged, ALL with Ignition ON so JBE Function is Active to process the Ground signal. Here are the Installation Location and Connector View for that Connector, X112: That means EITHER:ġ) the switch is intermittently connecting the BROWN/BLACK ground wire, connected to Chassis Ground Point X1108, to the Brown/White wire, ORĢ) there is a wiring fault in the Brown/White wire between the Reservoir Connector (X112) and the JBE (under the glovebox) ANY false ground in that Brown/White wire between the Switch and the JBE will cause the light to come on.įrom your description, it appears that YOU/Your shop have determined that the ACTUAL coolant level in the Reservoir is NOT an issue. The way it is SUPPOSED to work is to provide a Ground Signal to Pin #54 of Connector X14271 at the JBE (Junction Box Electronics) Module IF the coolant level is low, and THAT ground signal causes the Warning Light on the Instrument Cluster to come on. You have a Coolant Level SWITCH (NOT Sensor -) in the Coolant Reservoir. The amber light means your coolant level is low, while the red light means your car is overheating or that the coolant is below the minimum level that it should be. It stays on and within 4-6 seconds, it disappears. ![]() For the last 2-3 months, the coolant light on the dashboard has surfaced intermittently. ![]()
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