quakerj Posted June 9, 2020 Report Share Posted June 9, 2020 I have a 96 Grand Prix and last time I changed the oil, just for grins I turned the ignition on (engine off) and didn't see a low oil level indicator light anywhere on the dash despite there being no oil in the sump. I've read about / seen the sensor in the oil pan. How does the level sender work, is it only when the engine is running, or should I expect to see it when I have the engine off? Also the low coolant light on my dash comes on and off periodically despite there being ample coolant in the system and overflow tank level is where it should be. Is this likely just a failed sensor, and how hard is this to replace? Quote Link to comment Share on other sites More sharing options...
digitaloutsider Posted June 9, 2020 Report Share Posted June 9, 2020 I would imagine there is some delay for the oil level sensor (to accommodate situations where the car might be parked on incline or something). I don't know this for sure, but it makes sense to me. As for the coolant level sensor, it's on the side of the radiator and they are notoriously flaky. I've had them unplugged on every W car. jiggity76 1 Quote Link to comment Share on other sites More sharing options...
jiggity76 Posted June 9, 2020 Report Share Posted June 9, 2020 (edited) 10 hours ago, digitaloutsider said: I would imagine there is some delay for the oil level sensor (to accommodate situations where the car might be parked on incline or something). I don't know this for sure, but it makes sense to me. As for the coolant level sensor, it's on the side of the radiator and they are notoriously flaky. I've had them unplugged on every W car. Is this what the coolant level sensor plug looks like? It was just hanging between the rad support and header panel on the STE. I think it's the connector. Edited June 9, 2020 by jiggity76 Quote Link to comment Share on other sites More sharing options...
55trucker Posted June 9, 2020 Report Share Posted June 9, 2020 That looks like the *Hood Ajar* sensor, the STE's have a sensor that displays on the DIC screen when the hood is open. You found that on the forward side of the rad header? jiggity76 1 Quote Link to comment Share on other sites More sharing options...
jiggity76 Posted June 9, 2020 Report Share Posted June 9, 2020 Ah, ok. Thank you. It was hanging down in front of the radiator towards the light bar side if that makes sense. Quote Link to comment Share on other sites More sharing options...
jiggity76 Posted June 9, 2020 Report Share Posted June 9, 2020 I'll take better pics tomorrow. Quote Link to comment Share on other sites More sharing options...
rich_e777 Posted June 10, 2020 Report Share Posted June 10, 2020 (edited) Coolant level sensors are usually on the radiator on the side not far from the fill neck. Has a funny sort of clip that attaches to the radiator instead of bolts or screws. Both my Supremes have a similar sensor in your pic around that same location and I was thinking it was for the airbag for some reason. Neither have a DIC, and are both female, so would that sensor still be on a non DIC car? No "Hood Ajar" lights on the instrument cluster either. Edited June 10, 2020 by rich_e777 jiggity76 1 Quote Link to comment Share on other sites More sharing options...
jiggity76 Posted June 10, 2020 Report Share Posted June 10, 2020 (edited) 6 hours ago, rich_e777 said: Coolant level sensors are usually on the radiator on the side not far from the fill neck. Has a funny sort of clip that attaches to the radiator instead of bolts or screws. Both my Supremes have a similar sensor in your pic around that same location and I was thinking it was for the airbag for some reason. Neither have a DIC, and are both female, so would that sensor still be on a non DIC car? No "Hood Ajar" lights on the instrument cluster either. My Cutlass doesn't have this feature. There is a sensor on the hood latch of the STE, I'll take pics of it today. Like what 55trucker said, I bet this harness is suppose to be connected to it. Edited June 10, 2020 by jiggity76 Quote Link to comment Share on other sites More sharing options...
jiggity76 Posted June 10, 2020 Report Share Posted June 10, 2020 Thanks to 55trucker! Yup, that's what it is. The underhood light and hood ajar sensor. My 91 CS does'nt have this feature. Cleaned it up and reconnected it. Still won't work though. A previous hack job has cut the wires going to the sensors harness. Yet another thing I have yet to fix due to someone else's laziness or whatever. I ordered a new sensor just in case this one won't work when powered up. Quote Link to comment Share on other sites More sharing options...
55trucker Posted June 10, 2020 Report Share Posted June 10, 2020 Nice little addition, nuisance when one continually sees *hood ajar*, *hood ajar*, *hood ajar*. Personally I can see if the hood isn't latched from the driver's seat. jiggity76 1 Quote Link to comment Share on other sites More sharing options...
jiggity76 Posted June 10, 2020 Report Share Posted June 10, 2020 (edited) 23 minutes ago, 55trucker said: Nice little addition, nuisance when one continually sees *hood ajar*, *hood ajar*, *hood ajar*. Personally I can see if the hood isn't latched from the driver's seat. LOL, I'm hoping it will work correctly. If not, I'll see if my new one will. I hope so. I'm guessing the owners unhooked it because of that exact reason. Hopefully this is the same reason why my underhood lamp isn't working. Edited June 10, 2020 by jiggity76 Quote Link to comment Share on other sites More sharing options...
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