Pump runs on and off intermittingly

Did you flush the system out before installing the new water pump? Scale may have loosened up and blocked some flow. Reverse flush the engine, radiator and heater core. Removing the thermostat for testing is ok, but don't plan to run it like that. It may actually run hotter without the thermostat.

That sounds like a loose connection of the main power cable from battery to system. Check where it is connected (ob battery or starter) fo looseness. If OK check connection on main fuse box.

check the air pump for the system, it may be going bad. if ok. then check for a vacuum leak. have a good day !

i would be thinking along the line that there is inadequate fuel in the line when engine is cold. there is a regulator to keep fuel pressure right at all times, that could be bad or you could have something leaking down while the engine is off. i would not suspect the pump itself as it works after you get started.

You didn't mention how many miles are on the vehicle but your symptom points to a water pump with failed seals. They don't often fail at less than 100K but they can.

There is a small hole at the bottom of the pump housing that allows coolant to leak out if the seals fail to prevent the coolant from ending up inside the engine and damaging it.

some 3.0 engines hive a head gasket leak on the rear head on the corner hear the water pump..

Oil free pumps do tend to blow the piston ring (not too expensive) available at searsparts.com. Remove covers to pump and manually turn crank until piston is at top and look at the condition of the cylinder neer top, If it looks scratched, order cylinder kit with piston ring. If it looks good and shiney, could be the valve plate in the head. There are reed valves that tend to break. Run pump however with covers removed and check with soapy water for air leaks and repair as needed (air leaks under the cover will prevent unit from filling). Good luck

go here, our team will help you

http://groups.yahoo.com/group/villagerquest/

If the pump motor runs continously it probibly is a suction side air leak, check all "O" rings, gaskets and fittings, it could also be a restricted suction screen or filter basket as well, Need more info to get more specific.

pump is going bad