I just replaced my coolant reservoir with a newer used one that didn't have a coolant level sensor. It appears to be not available on the 95 and later cars. Mine is a 93 and was leaking, so this is why I replaced it. I thought I could easily disconnect the coolant level sensor and just short the connector and bypass it, but the indicator light came on anyway.
Investigation of the coolant sensor indicates a resistance reading of 8M ohm. If I invert the sensor, I get 9M ohm, so there is a 1M ohm difference between when its sensing whether there is coolant in the reservoir or not. Since I didn't readily have a 9M ohm resistor, I reconnected the sensor and inverted it and placed it in the engine compartment for the time being. I have yet to test this as its late in the evening….
I don't like the jury rig solution to defeat the low coolant light. Anybody done this in a more professional manner?
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I'm not sure how they differ visually -- didn't know they differ at all -- but can you modify the newer one to accept the older one's sensor?
The reason we dont really like the reserviors with the sensors, (92-94) is because they crack easily right beside the sensor. It's just a crack point. Guess where a crack is on my 92 SC? Beside the sensor.
Also I don't think one can simply drop the sensor in to the 95-up reservior.The mold that covers the hole is apart of the container.
1992 Lexus SC400,1995 Lexus SC400, 1996 Ford Explorer, 1971 Oldsmobile Cutlass SOLD, 1992 Ford Explorer SOLD
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Well, for right now, I hooked the sensor back up in the inverted position and secured it next to the coolant reservoir. At least the idiot light is no longer on until I can find a more permanent solution.
I was under the impression that zero ohms equals happy sensor. Ie. unplug it and the car will think its full. Mine is currently cracked all around the sensor so I took a plastic bag (the kind I work with is really thick like a triple thick garbage bag maybe) and covered the res with weekly refills. This is to gimp along till I can afford a new res. if I am wrong please correct me as Id like it to run right
My plan is to use a howe expansion tank instead as it's aluminum and won't crack later down the road (and cheaper too) the RX7 swaps use this with the ls1. Lol if I can find where I bought it last time I'd already have fixed it.
Anyway good luck. I currently have my sensor in the res but not connected, no lights in the dash. Although I am still chasing a hesitation problem I thought was caused by the coolant spraying my whole bay. Could be tps or maf at this point (no codes either)