coolant temperture sensor

I have a 89 cavalier wiht a 2.8 v 6. I located the coolant temperture sensor on the back of the engine...or atleast one of them. How do you test this? Everywhere I have looked says with a voltmeter one lead to the electrical lead on the sensor and the other on the sensor anywhere, for ground i suppose. I don't see how you test this. The main part is 6 sided bolted to the engine. On top is a wire. Does this wire just pull out? I don't want to rip it out if that isn't how it comes out. I know I'm looking for atleast a 200 ohm difference(i believe). This should tell me if the sensor is good or faulty.

Also while I'm at it. The old Car Of Rust On Last Leg Again, or 91 corolla. How do you bleed the cooling system? Upon further research if you open up the cooling system via changing the radiator(which i just did) or any other way, air gets into the cooling system and must be bled. I don't understand how you do this. Youtube has a million videos, most with the radiator cap open and then starting the engine and filling it. I tried this but felt stupid knowing antifreeze(or in this case, just regular water just to see if this is the problem) cause of course starting the engine with the cap out causes water to purge out like a fountain. I kept filling and filling but it keep bubbling and going back down. Is this something that takes some time?
Would letting the engine run for a bit and see if it overheats help in determining anything about it?

I can't offer specifics on the coolant temp sensor. This is probably another case where posting such vehicle-specific questions in the vehicle-specific forum would yield more and better answers. If you are on the correct sensor, the wire probably unclips from the single wire terminal. It's probably a spade connector. The body of the sensor is probably brass and would be grounded directly to the head of the engine. There will be a resistance table for the sensor which can vary from car to car, so again you'd want to get vehicle-specific information if you want to know if your sensor is in range. For a given sensor temperature, there will be a small range of measured resistance between the sensor body and wire terminal.

As for the Corolla and bleeding the cooling system, what is pretty typical for systems with a pressure cap on the radiator and a recovery/degas tank is to install the radiator cap to the first "detent." You may have noticed that when installing the cap you turn it about 1/4 twist then it meets some resistance. You push down on the cap again and it turns another 1/4 twist or so to a hard stop. That first point where it meets resistance is where you want to tighten to to bleed air from the system. With the cap installed to that point, start the engine and get it up to operating temperature. This position of the cap will allow coolant and air to flow out of the radiator an in to the recovery tank without gurgling out of the radiator neck. It makes for a clean bleed without wasting coolant. After several moments running at operating temp you can shut the engine off and carefully remove the radiator cap. Since the first position of the cap would not allow the cooling system to build pressure you should not need to worry about spraying coolant, but still be slow and alert. Slowly top the radiator off with coolant, watching to let the air bubble out and the level to drop, until you are at the neck of the radiator and no more air bubbles out. Then reinstall the radiator pressure cap and drive the car for a few miles (or days) and check again when the system is cool.

-Rod

I took the car for a drive after I got home from work. I just wanted to see if it would overheat, which it doesn't but there is alot of steam coming from around the engine. Either the water is boiling and turning to steam and escaping, or its getting into a cylinder and its turning to steam. Havent had a chance during day light to bleed it yet.

If you start it up, when it's cold, there shouldn't be any fountain coming out of the radiator. The symptoms you're seeing might indicate a bad head gasket.

Its really frustrating cause there wasn't bubbles in the coolant until after i took the big hose from the back of the engine to the radiator off. Is there anyway to tell if you have a cracked block?

This picture pertains to the coolant sensor in the other question I had. Should this just pull out or do I need to unbolt it out? I'm afraid of breaking the wire if i try to pull it out. I see no clip on it.
http://www.v6z24.com/mods/howto/images/locations/tempsensor.jpg