With the water pump removed, you have to heat the body of the water pump. There is a O-Ring that seizes the tube into the water pump. Sometimes you can just loosen the bolt and heat the pump with it still bolted up the engine. Use some pliers to wiggle the tube while pulling the tube. When you put it back together replace the o-ring and add some rtv sealant around the o-ring too. This helps the seizing problem. Hope this helps
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Locate the top radiator hose...follow it down to the motor...the housing that the hose connects to is where the thermostat is..usually there are 2 screws to remove and then it just comes up and the thermostat is inside
in the 5.2L V8 engine the coolant sensor is located on top of the engine. Locate the coolant thick hose coming from top of the ratiator to the top of the engine. Look at the place such hose connects to the engine you wont miss the sensor it is about one inch from there.
If you have a V8 the thermostat is located under the coolant inlet tube. The tube is located on top of the engine, in the front about center. The thermostat is hard to change.Locate the upper radiator hose on your radiator and follow it to the engine block it is located on the top front part of your engine and you must lean over the front and look down onto the block to see the thermostat housing.
If you haven't changed the plugs or had the fuel system cleaned, now would be a good time to do it. The number 1 culprit for rough idles is dirty injectors or plugs. You can try an injector cleaner in a can (or bottle) for under $10 and see if it helps, and then work from there. If there isn't any improvement then if you are able to, check the plugs for any gunky buildup and if you find a bad plug, make sure you replace them all (or have them replaced) at the same time.
there should be clamps on both ends of the hose. just take off the clamps and twist the hose off and replace it. make sure car is cooled down, coolant can be very hot. like most cars, it might be very hard to get at the clamps , so be patient. good luck