![]() If it DOES, your Switch is NOT the issue. 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. 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. Increased engine noise: When the engine doesn’t have enough coolant, it can make a rattling or grinding noise due to increased friction and wear. 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. 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. If your coolant level is low, with no obvious leak, and your car has a turbocharger, there might be a failure in the seal between the compressor and the engine. If this is the case, you will need to take your car in for service. In some cases, a clogged coolant flow meter can cause the light to come on. There can be many reasons why the Vw Atlas coolant warning light may come on. ![]() 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. This fuel/air mixture imbalance makes it slightly more likely to throw a check engine light. Causes of a Vw Atlas Coolant Warning Light on Causes of a Vw Atlas Coolant Warning Light on. You have a Coolant Level SWITCH (NOT Sensor -) in the Coolant Reservoir. 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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