PDQ-TA

iTrader: (1)

Got a small coolant leak and need to know:
1. How to do a pressure test on a LS1
2. How would I tell if it the pump or just the gaskets that are bad
Thanks

LS6427

iTrader: (2)

There's a pressure tester tool for that. Auto parts stores sell them, rent them, or sometimes let you use them.

BUT.....if you don't see anything on the exterior leaking thats obvious......make sure when you do the pressure test you REMOVE all 8 spark plugs. BECAUSE, if you happen to be loosng coolant through a leaking head gasket you will fill a cylinder(s) with coolant durig the test. Then when you go to start it you could severely damge or lose the entire engine from hydra-locking it. So do the test with the spark plugs out, if you don't see any coolant coming out of any of the spark plug holes after the test, turn the engine over for about 5-10 seconds to make sure you get any out that may be there, then put the plugs back in and fire it up.

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Kris Mangrum

Once you add pressure to the system just watch the gauge. If the needle drops your leaking somewhere. Keep pressure on it and look around until you find the leak. Be sure to check inside around the heater core.

LS6427

iTrader: (2)

Could also **** coolnt into the oil/crankcase via a cracked head or block. Check the oil dipstick for coolant if you don't see any leaks if the pressure drops.


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