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coolant leak?

 
Old 06-27-2019, 10:16 AM
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ZED-R1
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Default coolant leak?

hi friends

noticed a green puddle under my car today. I'm new to ownership of anything that isn't under warranty! Any recommendations on what to check first would be really appreciated.
Ran the car last night (very light use to a nearby car meet up). Haven't noticed any issues temp or otherwise.

Here are a couple pics - thanks in advance



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Old 06-27-2019, 11:37 AM
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Yup green Fluid is antifreeze. Looks like it’s on the driver side. Check the hoses first. Other than the radiator there’s not much else cooling system wise on that side of the car.
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Old 06-27-2019, 11:44 AM
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You may also want to check the weep hole on the water pump.
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Old 06-27-2019, 12:15 PM
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Check the bolts on the water pump as well. The water pump on the LT5 are rather large and have multiple bolts in multiple sizes. As these are made of aluminum as it the block just make sure they are all tightened. They can become loose over time and that maybe what is going on here. Hopefully. GC
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Old 06-27-2019, 08:45 PM
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on further inspection it looks like it is dripping from almost exactly the center of the car but further back than the radiator..... but in the engine bay can't see anything wet. worried it is the pump itself - which at Canadian vendors appears to be about $720!!

Seems like it's pretty tough to get access or even see the pump without removal of intake, lines, pulley etc...
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Old 06-27-2019, 10:29 PM
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That's a pretty good size leak you have going on there.
With an extension mirror and flashlight you can see the water pump bolts and housing. It is not unusual for bolts on these engines to to get loose over time. Remember, they are 25-going on 30 years old and go into aluminum.
I would try to identify the origin of the leak first. If it is leaking between the water pump housing and engine block, try tightening the mounting bolts. If it is leaking out of the "weep" hole or around the shaft you will need to remove the water pump and repair/replace. I believe Marc Haibeck is still overhauling the pumps.
Of course, it could be a hose. That would be the easiest fix.
Keep us posted as to what you find.
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Old 06-28-2019, 08:40 AM
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Paul Workman
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Originally Posted by ZED-R1 View Post
on further inspection it looks like it is dripping from almost exactly the center of the car but further back than the radiator..... but in the engine bay can't see anything wet. worried it is the pump itself - which at Canadian vendors appears to be about $720!!

Seems like it's pretty tough to get access or even see the pump without removal of intake, lines, pulley etc...
Mysterious coolant leaks: I bought a cooling system tester (air pump with a pressure gauge and various adapters in the kit) which was the key to finding a "pin-hole" leak.

That said, Haibeck Automotive rebuilds the water pumps - essentially bearings and seals are the issue. I'd give Marc an email. (IIRC, I spent under $150 USD (exchange) for mine.)
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Old 06-28-2019, 08:42 AM
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The water pump on an LT5 is not that hard to change. If you look in the sticky at the top Dynomite has some great tech write-ups. You can also find lots of information on the http://zr1.net/forum/showthread.php?t=14475 forum.
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Old 06-28-2019, 01:54 PM
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Trying to fiddle with a mirror and flashlight and can't find anything wet other than a cross member under all the pulleys............ can anyone give me an idea of where exactly the weep hole is located relative to other components so that I can get a little more precise?

Mechanic around the corner is closing early for the long weekend (July 1st holiday in Canada ), and said I can bring the car around on Tues.

Fun fact - the jack that I bought years back won't lift my Jeep and won't fit under my Corvette!! haha - time for new tools!

Thanks again fellas. Going to read through the sticky posts as well.
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Old 06-28-2019, 08:54 PM
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Originally Posted by Paul Workman View Post
Mysterious coolant leaks: I bought a cooling system tester (air pump with a pressure gauge and various adapters in the kit) which was the key to finding a "pin-hole" leak.

That said, Haibeck Automotive rebuilds the water pumps - essentially bearings and seals are the issue. I'd give Marc an email. (IIRC, I spent under $150 USD (exchange) for mine.)
What Paul said... go to your local Autozone (not sure what they’re called in Canada) and rent a cooling system tester. Pump it up to 15psi or so and watch for the leak. Sure sounds like a water pump. Pumps are out there. There are several on eBay right now. Still, for the money I’d send it to Haibeck and have it rebuilt.
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Old 06-29-2019, 09:22 AM
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any chance this is actually a new part? price $269 is way lower than what i've seen elsewhere. not familiar with the vendor.

https://www.zip-corvette.com/90-95-lt5-water-pump.html
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Old 06-29-2019, 01:04 PM
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Don't know about the pump. Have been happy with vendor.
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Old 06-29-2019, 07:31 PM
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Jerry's Gasket has a new one. Jerry is a stand up guy. https://www.jerrysgaskets.com/coolin...eatured&page=2
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Old 07-01-2019, 06:12 AM
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Originally Posted by ZED-R1 View Post
any chance this is actually a new part? price $269 is way lower than what i've seen elsewhere. not familiar with the vendor.

https://www.zip-corvette.com/90-95-lt5-water-pump.html
some people were asking big dollars for lt5 pump but they are available and can also be rebuilt by Marc at ZR-1 specialist

see if you have some ZR-1 bretheren near by. could just be a loose hose clamp

root cause analysis is the key right now!!
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Old 07-03-2019, 06:26 PM
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ok so I brought it to the mechanic nearby who is quite sure it's the pump since the leak is directly under the shaft. this is after he called me to tell me he couldn't figure out the parking brake. then said he doesn't handle coolant issues. real confidence inspiring.

The local GM dealer wants $1110 CAD just for the part!! (really just called out of curiosity)

place about 25 mins away that claims to be a corvette specialist said they "don't touch engines and that one is a Lotus".

~sigh~

I ordered a new pump and thermostat from rock auto at a very competitive price and will keep looking for an installer
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Old 07-03-2019, 08:23 PM
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Originally Posted by ZED-R1 View Post
ok so I brought it to the mechanic nearby who is quite sure it's the pump since the leak is directly under the shaft. this is after he called me to tell me he couldn't figure out the parking brake. then said he doesn't handle coolant issues. real confidence inspiring.

The local GM dealer wants $1110 CAD just for the part!! (really just called out of curiosity)

place about 25 mins away that claims to be a corvette specialist said they "don't touch engines and that one is a Lotus".

~sigh~

I ordered a new pump and thermostat from rock auto at a very competitive price and will keep looking for an installer
Man! This is terrible! LT5 water pump is not that difficult to find and it's about 4-5 hours to install. I know a few ZR-1 owners in Toronto who might help with where to go. But, Montreal? I have no idea.
Maybe, if you can find an eager mechanic, I can go over how to do this over a phone?
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Old 07-05-2019, 01:06 PM
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Closer to Toronto but we have gotten good reports from Z owners...
CANADA
Stevenson Specialty Cars, 35 Brook St. Unit 1, Port Perry, ON, L9L 1B5
905-982-0826, StevensonSpecialtyCars.ca [email protected]

H
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Old 07-05-2019, 01:47 PM
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5hr drive from Montreal unfortunately. Canada is a big place!

I'm playing phone tag with this place Durnin Corvette in Valleyfield, which is about half hour away. http://durnincorvette.com/

Looks like they do full restorations so this shouldn't be a massive challenge.
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Old 07-05-2019, 04:32 PM
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Last time my car needed a water pump I changed it in a parking lot on a cold night in Pennsylvania.
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Old 07-05-2019, 06:02 PM
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Originally Posted by phrogs View Post
Last time my car needed a water pump I changed it in a parking lot on a cold night in Pennsylvania.
That's been a long time ago Johnny! Next time it will be snowing a blizzard.
How have you been? Where are you now?
Semper fi
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