2006 saturn ion coolant light3/9/2024 ![]() It must be filled up to or just above the big seam in the middle of the reservoir to for the coolant level sensor to close. Obviously, make sure enough coolant is in the reservoir. Repair the coolant sensor problem and the A/C problem should go away. Some cars will cut power to the A/C if the coolant is low, the A/C system add heat to the system. The coolant level sensor is closed (0 resistance) when the coolant reservoir is sufficiently filled and open (infinite resistance) when the coolant level is low. The low coolant sensor uses the coolant to close the circuit, if the coolant if full you could have a problem in the wiring. You could also perform a resistance test on the coolant level sensor. Likewise, you should also see 12VDC if you probe the yellow/black stripe wire and a +12V source such as the jump start post on the UHFB with the engine running. Going by 05 wiring for the coolant level indicator, the sensor is a normally open switch held closed by full coolant to keep the low coolant light off. This should yield a reading of at least 12VDC. Re: 2006 Ion 2 Coolant / Gas Cap / Check Engine Issues. The passage air bag light stay on and some time I hear a noise do the light suppose to stay on Do you. If you don't get anything, try probing the pink/black stripe and a good ground to bypass the BCM. For the next week, check your coolant level frequently (with a cold engine), to be sure that there is no ongoing leak that requires regular. Use a 50/50 coolant-and-water mix, as specified in your owner’s manual. Simply top up your coolant to the Max or Full level when the engine is cold. If it does, try tapping on the reservoir with a rubber mallet or your hand to see if this will unstick the float in the reservoir. Solution: This is potentially an easy fix. Try unplugging the sensor to see if the light goes out. You should get a reading at or above 12VDC (closer to 14VDC with the engine running). The coolant level sensor is likely shorted. How are you measuring the voltage? Are you just probing the two wires at the coolant level sensor? If so, first make sure the key is in the RUN position and try again. It is only hot when the POWERTRAIN relay (slot 29 in UHFB) is closed which should occur whenever the key is in the RUN position. The 15A EMISS fuse is #10 in the underhood fuse block and also provides power to the oxygen sensor both heaters, MAF sensor, and canister purge solenoid. Shorting the connector sends 12v to the bcm to leave the coolant light off, an open circuit turns on the indicator or lack of 12v sent to the bcm. The body control module uses sensors before turning on indicators. I'm going by '05 wiring and presume the low coolant sensor circuit remains the same with the following remarks the pink/black stripe wire has 12 volts from a 15 amp EMISS fuse with the yellow/black stripe wire returning to the bcm (ground).
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