![]() ![]() This could be an indication that the temperature sensor itself is faulty. If the coolant light is on, you might not have a leak. What are the symptoms of a bad coolant temperature sensor? Low coolant levels can also indicate that there is a leak in a hose, a water pump, or some other part of the vehicle where the coolant flows.Ĭheck for leaks and check the sensor and the connections to the sensor and you may find the problem that is keeping the coolant light turned on. For one, the sensor itself might be bad, or the connection to the sensor may be corroded, damaged, or loose. If you notice that your coolant light remains on even after you fill up the tank, there are several reasons why this could be happening. Coolant Light Turns On When Tank Is Full FAQ Why is my coolant level low even after filling? ![]() You'll want to take your vehicle to a qualified repair location to diagnose and repair your problem if you can not easily diagnose it yourself. These are some of the possible causes of a coolant light going on when the tank is full. Check the wiring to be sure nothing is loose or corroded. Your problem also be a faulty coolant level module. Also watch below your car for any telltale drips. That may be an indication of a leak that you haven’t seen yet. While you drive, take note if you smell coolant. You may not notice the difference at first, thinking that your tank is fullĪ repair to a cracked engine block or head gasket is an expensive repair. When you get a crack in the block or the intake gasket you will leak coolant and oil, usually slowly at first. Your coolant light might be signs of a more major engine problem. If you recently had your thermostat replaced, check to see that it was replaced with the correct temperature range. Your thermostat may be stuck open and causing improper readings. You may have some sensor problems that stem from the thermostat rather than the sensor. Replacing a sensor that is starting to show extreme signs of age and wear can prevent future problems. It is not a bad idea to keep an eye on your sensor’s readings. ![]() If your car is older, the sensor has deteriorated with time and may be failing but not entirely failed. More often than not, though, you will need to take voltage and resistance readings from the sensor to see if it is functioning properly. In this case, removal and replacement is necessary. You will be able to see if it is cracked or badly corroded. Visual diagnoses can sometimes detect a problem with the sensor. Have all of your connections checked to see if this may be the source of your problem. It is likely that the problem may be a loose, corroded, or faulty connection and not a problem with the sensor itself. A bad coolant sensor may cause a decrease in fuel efficiency or it may also cause the vehicle to fail your emissions inspection. I tapped it into the wire going to rear lights.Your sensor may fail or it may simply give a bad reading. lights? I did just install a wind restrictor with a light strip. Could that be loose? Could a loose ground wire on the wind restrictor light cause the taillight issue?ģ. I tapped it into the wire going to rear lights. What is the coolant issue? I just bought it last year and previous owner said water pump was replaced by original owner, I’m 3rd owner. During this trip my wife who was following me advised the taillights (running lights, not brake lights) we’re going on and off.ġ. I turned it back on and the traction control light was off and it seemed fine. I pushed the traction control button on the dash under the radio and nothing happened. A mile into the trip my Traction control light came on and said it needed servicing. Today I was driving it to the shop to have new charge pipes and a downpipe put on. This happed again the following weekend so I topped it off again. It does not have any smoke coming out of the muffler. I checked the oil, which was just changed a few months ago, about 500 miles ago, and it loooked like good clean oil, no milky look to it. I can find no sign of leaking coolant anywhere on the ground under the car, on the motor, or under the hood. So I let it cool off and then topped it off. When I reached my destination I was about 1.5” low. I stopped and looked at the reservoir and it was about 1” lower than the middle of the tank, at the molded plastic line I usually keep it at. I always monitor my temps and they always run about 192-204. About 70 miles in I got the low coolant warning. I have a 2009 RL and a few weeks ago a took it on a 140 mile trip. ![]()
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