![]() ![]() 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. The car however idles very rough (Sometimes stalling) in slow moving Traffic. The Coolant warning keeps coming on in the odometer panel, even though the car is not running hot or showing any signs of temperature issues. These sensor are notorious for going bad. 2005 Saturn Ion 4 cyl Front Wheel Drive Automatic. 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. My low coolant light was intermittent for a week or so and then it was stuck on. 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. This should yield a reading of at least 12VDC. If you don't get anything, try probing the pink/black stripe and a good ground to bypass the BCM. You should get a reading at or above 12VDC (closer to 14VDC with the engine running). - classifieds - forums - webmail : Forums > Models > Saturn Ion > Ion Tech: Coolant light User Name: Remember Me Password: Register: FAQ: Social Groups: Calendar: Search: Todays Posts: Mark Forums Read: Advanced Forum. 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. Replace the 15-amp 10 emissions fuse in the UHJB (Under Hood Junction Box). 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. 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 low coolant sensor uses the coolant to close the circuit, if the coolant if full you could have a problem in the wiring. 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. DATE: NOVEMBER 2003 SLIGHT LOSS OF COOLANT OR LOW COOLANT LIGHT COMING ON WITH NO SIGNS OF EXTERNAL LEAKS 200304 Saturn VUE and ION 2004. 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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