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Help! coolant leak

Rod1945

New member
Joined
Mar 29, 2019
Messages
2
Location
1907 priscilla st. las vegas.n
Corvette
2008ZO6
I have a 2008ZO6,it has a coolant leak which seems internal.I have had everything checked,coolant tank and cap have good pressure,new water pump,heater core dry,new intake gaskets,spark plugs clean,oil clean.Still losing a gallon of coolant every two weeks.Car runs great,except for the leak.Any ideas?
 

thatguy

New member
Joined
Mar 29, 2019
Messages
3
Location
Tampa
Corvette
1995 flame Red Coupe
Gulp... Any smoke out of the rear end, especially after initial start up? Open the coolant res while the car is running and look for bubbles. Could be a blown head gasket and coolant is leaking into your cylinder head(s). If you see bubbles in the res, while running that is a confirmation.
Did you overheat recently or around the time of coolant disappearing?
 

LLC5

Well-known member
Joined
Sep 28, 2004
Messages
2,299
Location
Wa.
Corvette
98 black 6spd convert.
I have a 2008ZO6,it has a coolant leak which seems internal.I have had everything checked,coolant tank and cap have good pressure,new water pump,heater core dry,new intake gaskets,spark plugs clean,oil clean.Still losing a gallon of coolant every two weeks.Car runs great,except for the leak.Any ideas?


How many miles in those 2 weeks? That is a lot of coolant to lose.

No coolant on the ground or on the engine? If it hasn't been on a hoist, do it and inspect closely. If you see anything, follow it to the top of the fluid leak.

If you think it is internal, have a cylinder leak down performed with the radiator cap off and water to the top of the neck and look for any bubbles on each cylinder.
 

Hib Halverson

Technical Writer for Internet & Print Media
Joined
Jan 10, 2001
Messages
13,453
Location
CenCoast CA
Corvette
71 04 12 19
OMG
A gallon of coolant every two weeks is a freakin' ton of coolant.

If there are no signs of combustion gases in the coolant and there are no external leaks, if there are no symptoms of a head gasket leak from cooling system to a cylinder than you likely have a cracked or porous head.

Pull the spark plugs, if you have one which looks much cleaner than the others, that might be a leaking cylinder. As "LLC5" suggests a leakage test or even an ordinary compression test might help the diagnostic process.
 

Joetejada18

New member
Joined
Jul 14, 2020
Messages
1
Location
8740 comanche ave
Hey did you end up find out what happened & get it fixed? Im on the same boat right now i just bought a 09z06 2 mo ago with 34k miles now @38k & its been saying low coolant so took it in to a local vette shop and they couldnt find any leaks so the guy told me its leaking into the heads but im taking it this weeknds to American heritage they worked on the heads before paid by the prev owner so im wondering if they made a mistake when redoing the heads ?
 

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