how do i change the water pump on my 2006 ls? on 2000 Lincoln LS

when my car heats up the heater dont work. makes me think the pump is not working or the thermostat is stuck. (the thermostat is 500 miles old). i have intermitant overheating. between 242 and 214 normally then the guage will suddenlly peg out every couple 3 days

Asked by for the 2000 Lincoln LS
Maybe first have a chemical test known as a "block test" done, it looks for the presence of carbon monoxide in the cooling system which would only be present if the head gasket was blown or mildly blown. The Jaguar 4.0L engine similar to your engine did have water pump impeller failure. Call the Ford parts department ask them do they sell many water pumps for that year/model.
There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate