What are sighns of a bad water pump - 2000 Jeep Grand Cherokee

sounds like blown head gasket

Assuming that this is a non-interference engine and that it wouldn't be damaged from being a tooth off, it would either idle fine but make very little high-rpm horsepower, or idle very badly but runs great the higher it revs (generally speaking). This is not adjustable, it has to be taken apart and fixed properly.
This would be very dramatically noticeable, by the way.
Replacing the belt will mean that the ignition timing would have to be checked (if it has a distributor that runs off of a camshaft). This could solve your pinging problem.

Try replacing thermostat. That's where I'd start.

I have a 96 2wd chevy Blazer runs fine till i get about a mile or so up the road and then shuts down when i brake at stop sighns please help

this sounds like the power supply has been disconnected at some stage and may need the computer reset

not sure if i understand everything, the ac,will drain condensation water under the car,that a sure sighn that its working properly,the air conditioning system has almost nothing to do with the engine and the coolant system,directly,it runs off a belt powered by the engine,if you overheated your engine ,bad enough,meaning that the second you noticed the car was hot you didnt immeaditly pull over and shut it down,or even if you did.it may not have been soon enough,remove the oil fill cap look at the bottom of it for sighns of antifreeze or water,brown milky substance looks like choclate milk,

Most likely the bearings went bad in the water pump and caused the lock up situation .So i would have your water pump looked at.

Check your fuel pump.

Good luck.

could be a bad gasket or a bad water pump.If the gasket isn't sealed properly you with spray out water.It is possible to get a bad water pump,but not likely.Check the gasket first.