Question about 2003 Volkswagen Jetta TDI

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Coolant problems 2000 vw jetta

My car started overheating. I checked the top radiator hose and it was hot, the bottom radiator hose was closed. I assumed that the thermostat was stuck so I changed it. After changing it I took it for a test drive, it started over heating again, when I pulled in my driveway, the radiator blew coolant out from the middle.I checked both the hoses and they were both hot. I just changed my water pump 6 months ago. what is the problem/

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  • danny2019 Mar 29, 2009

    I have changed all hoses and thermostat and the car is still over heating. the radiator cap blew off and i changed it. now the car does not even turn on.

  • helpyou May 11, 2010

    One test you can do to see if the system is circulating is on the radiator resevoir tank remove the little upper hose. (This is the one with the blue cap. Remove the hose and remove the cap. Hold the hose over the bowl so any cooant can return into it. Have a second preson start the car and hold the gas at about 2500 rpm in park or neutral. Coolant should flow out with a decent pressure. If little or no coolant flows chances are you have a blown water pump or a block in the system. I know you just replaced the water pump. But do not put that aside as a cause just yet.



    If your radiator blew out in the middle chances are you have too much pressure it sounds like. A blocked system or a head gasket could be the cause. Did you bleed the system after replacing the thermostat.



    Usually a thermostat stuck closed will cause the upper hose to get hot and the bottom to stay cold and the engine will overheat. But numerous other things as well. Including circulation, blocked radiator, or fans that will not come on.



    Let me know after trying the test to see if the coolant flows as I mentionned.

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Normal operation is that the engine starts the thermostat is closed , engine block heats up and opens water starts to circulate around the block

So to check that you need to fill the radiator with cold water run it for a few minutes check the bottom hose it should be cold

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the thermostat can be difficult to get at because the AC and power steering pump are all bolted on top of the water pump,

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