98 oldmobile regency won't start up and check

Fit or have it fitted a new radiator and look for a broken sender wire in the loom from the fuel tank.

Lisle Combustion Leak Detector This sound like a head gasket. I have included a link to the tester and a utube video showing its use.

I'm guessing you mean transmission fluid poured out? That would certainly explain why it won't move. The most common leak point for older automatic transmission cars are the transmission cooler lines. They run from the radiator to the transmission (the cooler is built into the radiator) and they are made of steel so they are prone to rust. I would start looking there. The other leak points would be the lower pan, axle seals, and where the case bolts together. Take a look at the radiator and you should see some small steel lines bolted to the radiator. Follow them and look for heavy rust that is wet with fluid.

There's a product called "Barr's Stop Leak" that provides a temporary fix...but when you have a radiator leak, its best to either get it fixed at a radiator shop or depending on model...get a replacement.
By just patching a leak...you are putting your engine at risk.

Look at the side of the engine block above the oil pan just in front of fire wall.

Hi!!
The cooling Fan Pressure Switch is located on the side of the Radiator, usually below the upper hose. It is available at AutoZone or similar auto parts store for about $20. Here is a pic. of the Switch to help you identify it.

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water pump is leaking.Change it as soon as possible.

Was the cap on correctly when you opened up to refill it? To verify a leak clean up any residue that is on the engine etc and let it sit...then check for anything on the ground, chassis and at any hose connections. Check for leaks cold and hot. When hot there is pressure in the system and may reveal leak, however, many water pumps leak better cold with the cap removed (pressure actually will push the seal against the shaft and stop it from leaking) " It's leaking and I don't know where" isn't a statement I'd ever permit to pass me by...My next question would be, show me where. That does nothing to instill confidence in that shop.
One note: if it does turn out to be a pinhole in the radiator, believe it or not, a tablespoon of black pepper actually works. Just don't use more than two.

Make sure the electric fans are operating as they should.
Check for a blocked radiator core,
Check water pump drive OK,
Get a radiator shop to do 'coolant gas check' for a blown head gasket (looks for combustion gas bubbles in the water system).

Pressure test the system and check for leaks, use a radiator pressure testing tool kit. Sounds like the radiator may have been damaged by the parts breaking and flying about.