2000 Jaguar started running hot. We changed the thermostat but it still runs hot. There are no leaks around the water pump or under the car. We did notice the condenser fan would keep running, and the coolant resevoir would bubble up and run over with the cap off. Do you have any ideas?
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Re: Water pump problem?
You need to make sure you don’t have an air lock. Find the bleeder valve for the coolant system and release the air. If you can’t find the bleeder, find the highest hose for the coolant system and make sure coolant is flowing through it.
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1. Make sure you do not have an air bubble in your cooling system. Easiest way is to park facing uphill and let the car cool off. Remove the radiator cap, start the car and let run until the thermostat opens. If there are air bubbles in the cooling system the should be forced out. Top off fluid.
2. Are you sure that the cooling fan is running? When the car is getting hot, open the hood and make sure the radiator fan is actually turning.
Remove thermostat and test it by dipping it in cold water ib an open pot. Heat the water on the stove while observing the thermostat. It shold opel just before the water boils. If it does check the radiator itself for clogging. Also fluch the engine water galleries.
did you let excess air out of radiator? after filling let it run for a few minutes with out radiator cap and make sure the water does not go down and serculates after thermostat opens, refill if needed
do you notice moister under vehicle in the morning ? possibly a gasket could be leaking.
Thanks for choosing FixYa and welcome to the site. They all are right. Anyone of those parts can cause overheating. The most common issue is the thermostat though, followed by the water pump. You could have a defective coolant sensor. If you have a bad head gasket, it will cause overheating. If you change the water pump, change the valve and the impeller also. Do this. Check your coolant level first and make sure it is level. You said fans are good. Make sure the radiator is good and is getting fluid inside it. Make sure there are no leaks. Check all coolant hoses. Like I said, the most common issue is a sticking thermostat or a bad one. Next, I would say the water pump.
flush your radiator first.with the thermostat out you should see the water moving if not bad water pump.this engine needs the thermostat to function properly and either a 50/50 coolant or straight coolant so it does not boil over.also make sure your fans are coming on