C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Water pump

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Old Mar 25, 2009 | 04:31 AM
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Default Water pump

I am discovering a pool of coolant on the ground under the front when parked for a few days.
I have checked hoses etc they seem fine,Would this likely to be coming from the weep hole in the water pump?
if so, is replacing the pump the only option.
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Old Mar 25, 2009 | 05:53 AM
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Yes and Yes
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Old Mar 25, 2009 | 05:59 AM
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Or it´s the waterpump gasket that has given up.
Has it been acting up strange lately, the temp I mean?
Let it warm up and see where it comes from, at least you have an 89, so you don´t have to worry about the opti, since you don´t have it.
Maybe it´s enough with just a new gasket and some coolant.
If it´s not the gasket, then I would start to think about a leak somewhere else in the engine, like head gasket.
Check oil for water contamination like light brown sludge under the oil cap, or small water drips/beads on the oil stick.
Or the other way around, "rainbow colors" in the coolant (under the pressure cap).
How is the level in the overflow tank (in front of the right front wheel)?
Is there coolant in the system anyway?
If your "down under", it´s not uncommon that a previous owner only ran normal water or filled up with only water after a leak.
That clogges up the system eventually and causes all kinds of ....
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Old Mar 25, 2009 | 07:19 AM
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Originally Posted by vette079
Or it´s the waterpump gasket that has given up.
Has it been acting up strange lately, the temp I mean?
Let it warm up and see where it comes from, at least you have an 89, so you don´t have to worry about the opti, since you don´t have it.
Maybe it´s enough with just a new gasket and some coolant.
If it´s not the gasket, then I would start to think about a leak somewhere else in the engine, like head gasket.
Check oil for water contamination like light brown sludge under the oil cap, or small water drips/beads on the oil stick.
Or the other way around, "rainbow colors" in the coolant (under the pressure cap).
How is the level in the overflow tank (in front of the right front wheel)?
Is there coolant in the system anyway?
If your "down under", it´s not uncommon that a previous owner only ran normal water or filled up with only water after a leak.
That clogges up the system eventually and causes all kinds of ....
The overflow tank does not seem to change level at any time and I have fitted a new pressure cap(which is a different issue again).
I only have to add small amounts of coolant to keep it topped up,
No oil /coolant contamination at all,the Water pump appears original
(82,000) So im leaning in the direction that this will be the problem,
Thanks Guys
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Old Mar 25, 2009 | 08:46 AM
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Use a telescopic mirror and have a good look.
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Old Mar 25, 2009 | 08:50 AM
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Just read over my own post here, and thought "waterpump gasket", I´m pretty funny here, does the water pump have a gasket anyway?
I was thinking about the T-stat house gasket all the time and wrote water pump.
Do we even have a gasket there?
Wouldn´t sound to funny, but I´ve been wrong before.
Time to look in my FSM I guess...
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Old Mar 25, 2009 | 09:09 AM
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There is a gasket for the water pump, get under it and look for a stain from the leak you should be able to see one or wet spots behinde balancer on the pan.
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Old Mar 25, 2009 | 09:20 AM
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Check the water pump weep hole, too. Sometimes you can hear a failing pump bearing squeal or rattle while the engine is idling. You can also use a mechanic's stethoscope to hear suspect pump noises.
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Old Mar 25, 2009 | 12:01 PM
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Anyone tried washing the engine clean and then dumping dye in the coolant?
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Old Mar 27, 2009 | 11:01 AM
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Excluding the hoses there are four places that can leak coolant. The first two places are between the block and the water pump (the contact areas should have a gasket), the third place would actually be behind the water pump itself (also has a gasket), and the fourth place would be from the weep hole. It is relatively easy to clean the water pump and surrounding area, let it dry and get it up to operating temp to check for leaks. It sounds like the pump needs to be changed as the car has 88k miles on it. Not a difficult job but does take time.

If you clean the pump area you shouldn't to use any dye to see if there are any leaks.
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Old Mar 27, 2009 | 01:35 PM
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Originally Posted by 89 Bob L
If you clean the pump area you shouldn't to use any dye to see if there are any leaks.


If the coolant is changed regularly, then it should be a nice green color, and therefore easy to spot when leaking.

I changed the water pump on my 86' about 2 months ago. The driver's side pump-to-engine gasket was leaking, but since it was original, I just replaced the whole pump with a new "Flowcooler" from Summit. It came with the gaskets.

Water pump replacement, as mentioned, is not hard, but is more cumbersome than it should be, as you have to remove the A/C bracket and disconnect the fuel send/return lines to get the pump off. You should also replace the lower heater hose (I got mine from NAPA, I had to cut it to fit, but it had the correct bends) as you will "already be in there" .
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Old Mar 27, 2009 | 01:43 PM
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But , If you can't see where its leaking, dye is a good option. You can get a kit from either Corvette Central or Ecklers that includes everything you need an they do work..WW
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Old Mar 27, 2009 | 01:51 PM
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I would think they are available at Napa or many other stores of that nature.
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