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Hello all! I had anti freeze leaking from my 1998 Dakota Sport. I replaced the water pump, problem solved. However, I now have a water leak near the same area, but I can't pin point it, plus, it only happens when the engine been running for about an hour. I think it might be the A/C but I haven't been using it. Any suggests will be greatly appreciated.
 

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It possibly could be water condisated from the a/c system if you happen to use a defrost at all other than if it isnt green or the same color as your antifreeze then i would not worry to much just try to take that hour when you see it happen and trace it back to the initial source.
 

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Hello all! I had anti freeze leaking from my 1998 Dakota Sport. I replaced the water pump, problem solved. However, I now have a water leak near the same area, but I can't pin point it, plus, it only happens when the engine been running for about an hour. I think it might be the A/C but I haven't been using it. Any suggests will be greatly appreciated.
First of all, let's clarify "water leak" here. It is COOLANT in your engine block,
rad, and waterpump, hoses, heater core...and NOT WATER.

It is typically a mixture of 50% water and 50% ethylene glycol (antifreeze)
and should have some colour and "taste" to it. Antifreeze on the tip of
the tongue tastes sweet..water will not.

Ok..so you had some sort of water pump issue and you replaced it?

Q: When was the pump replaced and WHEN did the leak start AFTER
the pump was replaced?

Q: Does it ever leak when the coolant pump IS NOT running..ie: engine
cooled down over night?

You can verify that by placing a piece of card board in the leak area, after the initial leak period, overnight.
The cooling system once cooled down sufficiently, will have the pressure released normally, and that is why you can open the rad cap on a cold engine..but if you try that on a hot engine (even not running), coolant will gush out everywhere at approximately 15 psi pressure!

So, it could be coolant..so here are some facts about your Dakota
cooling system.

1.It operates under 15psi rad cap pressure, so once the pump
is running and the engine gets up to normal operating temp, the
entire cooling system will be pressurized to "squeeze coolant"
out of any tiny gasket area/seal/rad hose "pin hole" or around any
rad hose clamp that is not sufficiently tight enough.

2. Water pumps (actually should be called a coolant pump) has what
they call a "weeping" hole that allows coolant leaks around the bearing
and packing to drip down the engine block.

Some possibities for you to investigate:

1.WAS the proper coolant pump gasket used on the new coolant pump?
2.WAS the pump NEW or re-manufactured?
3. Did the lower rad hose get replaced (the inlet hose to the pump),
if not..how old is the hose?
4. What type of clamps on the lower rad hose? New (gear type) or
the oem supplied wire style with a nut and bolt fastner mechanism
to tighten it up?
5.Was the cooling system pressure tested to at least 15psi to verify
no leaks in the rad itself, the hoses or the pump after the
pump was replaced?

Check these points out and report back to me. :D
 
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