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A belt drives your water pump, most are the same belts that turn your altenator and air compressor. Some water pumps are turned by the timing belt. But if you can see that your belt is working the water pump, altenator and compressor, its working. If you had a water pump powered by a timing belt, you would not be able to start your car if that belt stoped.
Water pumps never stop working, they are direct shaft driven.
The only thing is they do start to leak after they get older, then need replacing.
If it cranks over but sounds like it's almost cranking too easily or fast then you may have a broken timing belt. The timing belts on these should be replaced about every 90,000 miles and will break if they get much "older" than that. The 2.2 and 2.3 are Interference type of engines, meaning that if the timing belt has broken then the valves can be [and usually are] damaged by being struck by the pistons since the camshaft can't turn without a working belt. Of course there are a whole list of other possibilites of things that could have caused it to stall but a quick inspection of the belt should confirm or eliminate it as a cause.
if you have the 2.4 engine, the water pump is external and driven by the timing belt.you need a water pump - timing belt component kit. the 2.7 has a internal water pump driven by the timing chain. here again you should install a water pump- timing kit. 2.7 is more complex and expensive to change
This engine has been identified as an interference engine in which the possibility of valve to piston damage in the event of timing belt failure is most likely to occur, when repairing I would also replace water pump, due to pump is timing belt driven. On an 2002 VW Jetta TDI 1.9L engine, VW recommends timing belt replacement every 80,000 miles.
Didn't specify what engine but if its the 4 cyl water pump is pulley driven from a belt and is easily seen and changed. If you have the 6 cylinder you will be going into the timing chains as the pump is driven by a chain. Not a do-it-yourself job.
No there no way way of knowing without replacing the timing belt, cylinder compression test at this point would not work due to valve's open at wrong time, this engine is a INTERFERENCE ENGINE, but you might get luckly where it did not damage valve's it's happen here at my repair shop, also you don't have to replace the water pump, it is not timing belt driven water pump
It is suggested by any mechcanic to perform this maintenace every 80,000 miles if you properbly maintain your vehicle. That mean going by the owners manual suggestions. Also I would highly recomend changing the water pum as well for it runs off this belt and water pumps only last as long as the belt will also. If a new belt is installed without a new water pump it may fail in no time. I seen it happen more than a dozen times in the past ten years
if this helps.. I had the 1998 model S70. the water pump was driven by the timing belt. you had to take the timing belt off just to replace the water pump. it was just a simple bolt on replacement. the only difficult issue is resetting the hydraulic tensioner on the timing belt. the hydraulic tensioner has to be completely taken off and compressed VERY SLOWLY in a vise. then insert a very hard drill bit or (special volvo tool) into a keeper hole, reinstall hydraulic tensioner onto car and reinstall timing belt.very quickly remove drill bit from keeper hole in tensioner and the tensioner snaps back out to put tension on belt. and you are done.