This worked for me one time but then it got stuck again about a year later and I couldn't jar it loose.Ģ) Empty and remove the reservoir tank. If the problem is a stuck-bobber, then you can try to fix it in one of 3 ways:ġ) Try tapping the reservoir (near the sensor) with a hammer and/or screwdriver butt firmly to jar loose the bobber- but not so hard that you crack the reservoir tank. I don't think that there's much that can go wrong with a sensor that simply detects a magnet, but you can gamble on replacing it (and maybe return it to the store if it doesn't fix the problem). I replaced the sensor but it didn't help. But I still thought I'd try replacing the sensor. When I told my mechanic about the low coolant warning light, he immediately told me that I needed to replace the coolant reservoir- and he told me that I could easily do so myself. It is easy to remove with a needle nose pliers and cheap ($11-$14 on Amazon as of January 2015) but I think that in most cases the sensor is NOT the problem. The coolant level sensor is located on the outside of the tank. If the bobber gets stuck in a low position, then the sensor reports that the coolant level is low. That bobber has a magnet which is detected by the sensor. ![]() But more likely, the bobber on the inside of your coolant reservoir tank is stuck in its track at a low position inside the tank. In that case it could be (1) the coolant level sensor switch, which is located on the outside of coolant reservoir tank. ![]() You may constantly or frequently get a "low coolant" warning light on your dashboard cluster but when you check your coolant reservoir tank, the coolant level is always fine. I am writing this based on my 1996 Cavalier 2.4L, but I think the same (or similar) coolant sensor system is used on all Cavaliers and Sunfires of that era, and perhaps on many other vehicles or different generations.
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