Let me start by saying my 1995 explorer was running fine. The water pump started to leak out of the weep hole, so i replaced the pump. That's where the problem started. I now have temp guage fluctuation and thumping sounds in the hoses. Have replaced the radiator hoses, thermostat and radiator cap. Have had the coolant system flushed. Took it to a mechanic yesterday and they seem to think its a cracked head or head gasket. No other signs of this though. Could i have possibly gotten the wrong or bad pump. As i said before, it was running fine before the pump replaced.
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Check air passage across radiator for blockage, also look for leaks along seam of radiator headers. Malfunction of thermostat, also look around weep holes on water pump it my be in the failure stage.
Really check for weep hole leakage of water pump.
there are two things that can be wrong here. 1-wiring or the sensor itself may be bad. 2-you have a bad head gasket(not blown all the way)but starting to go therefore the fluctuation on the gauge itself. does it go down when you give it gas? does it uses coolant with out leaking? let me know
Is antifreeze coming from "weep" hole in bottom of case under shaft nose? is it coming from the heater hose (small hose coming of side and going into firewall to heater core inside engine compartment? is it coming from bad gasket between pump and front case?
get a paper towel and dry these areas then start engine. when it starts leaking that will tell you if you need to change the water pump (gasket leak or weep hole shaftseal leak) or if you just need to replace/repair heater hose.
try the thermostat, located on the top radiator hose. top side of engine. also does it steam?? does it lose water but no leak, does the heat blow hot? if your heat isnt hot and it steams and loses water you may have a cracked head or head gasket. if you have heat, doesnt lose water and doesnt steam it may also be your water pump. most pumps will leak visibly from the weep hole when running
This is not something you would typically see. Are you purchasing a rebuilt or new pump? Buying from dealer or after market parts store?
Most major chain parts stores (Pep Boys, Auto Zone, Advance, O'Reilly's, etc. offer a 1 year warranty on they lowest cost pump, and typically a limited lifetime warranty on the higher priced units. If you only got a 90 day warranty, you might want to explore something like I've described above.
Check the belt at the water pump to make sure that everything is tight and rotating properly. Usually if a water pump goes bad it will start leaking out of the weep hole. Make sure that your fluid is full and that the mixture is correct (50/50). If fluids are good, belt is tight, your thermostat is probably stuck closed. If the temp outside is below freezing and you have too much water in the system, it may have froze up.
Need more info. Where is the coolant leak coming from? There is a "weep hole" on the water pump. Coolant will generally start escaping from that hole as the seal wears/ages.
The "stalled out" condition could be related to some other issue.
sounds more like the thermostat may be failing. generally a water pump starts leaking out of the "weep" hole in the casting before it quits. just look at the front of the water pump for a greenish streak or an obvious leak.
if you also suspect you heater core may be getting plugged now would be a good time to back flush it to get rid of some of the gunk.