how many coolant temp sensors are their on a 99 L67? I got a warning light for engine coolant is low, but it isnt. The original seller said his mechanic said there was 3, and no way to check which one.

As far as my knowledge goes, there is only 1, and its on the lower right side of the LIM. is there one in the radiator also?

Coolant temperature, or coolant level sensor? The level sensor is on the radiator, generally the passenger side, maybe 1/3 of the way down the tank. A small square, or rectangular box, with an electrical lead running to it. They can get crudded up, and just wiping it clean with a rag (after removing it) will often take care of the problem. Or, you can just disconnect the wire.

thanks for clearing that brain fart up. I'll take a look at the LEVEL sensor

The level sensors are known to crud up in the older cars. Maybe the dex is sluding you a bit.

this car is dex free. the last owner converted it, nice green coolant in there.