Is This Normal?
Thread Starter
Melting Slicks
Joined: Sep 2007
Posts: 2,387
Likes: 123
From: CA.
Is This Normal?
after driving my 72 bb i parked in garage and there was a puddle of anti freeze that came out the overflow tank hose. never did it before and i didnt add lately. didnt do it when i was driving it dont think because my driveway was dry. temp. was in normal range.
Safety Car
Joined: Sep 2005
Posts: 4,203
Likes: 643
From: Orange County Ca
Sometimes they just puke out a little. Maybe ran a little hotter, fan belt is slipping on the water pump, etc. Check out everything. If it is just a small amount, keep a eye on it, and it may be OK. Worse case senerio, head gasket.
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Race Director
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Most common reasons for puking after shutdown
1) the system is over filled and is seeking it's own level
2) weak radiator cap that cannot hold the peak pressure in the system after shutdown.
Thread Starter
Melting Slicks
Joined: Sep 2007
Posts: 2,387
Likes: 123
From: CA.
Corvettes prior to '73 did not have 'overflow' tanks. If you are referring to an aluminum tank separate from your radiator but with a radiator pressure cap on top, that's an expansion tank. Very different animal than an overflow tank.
Most common reasons for puking after shutdown
1) the system is over filled and is seeking it's own level
2) weak radiator cap that cannot hold the peak pressure in the system after shutdown.
Most common reasons for puking after shutdown
1) the system is over filled and is seeking it's own level
2) weak radiator cap that cannot hold the peak pressure in the system after shutdown.
Last edited by nutsy; Apr 13, 2008 at 09:59 AM.
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The expansion tanks should be kept at 1/2 full or they will puke after shutdown.
Thread Starter
Melting Slicks
Joined: Sep 2007
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From: CA.
Race Director
Joined: Jul 2001
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Filling the tank any higher than recommended is fruitless. It does not help the car cool any better and only serves to reduce the amount of airspace required to absorb the pressure increase after shut down. Most people don't realise that the cooling system reaches it's highest pressure AFTER shut down due to soak back heat from the engine.
Instructor
Joined: Feb 2008
Posts: 237
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From: Roseville CA
The rubber seat of the cap holds a tight seal on the seat of the radiator neck until the internal tank pressure exceed that of the caps rating. If the seal is torn or gouged, some seapage will occur even though the pressure does not exceed the caps pressure. Chevy dealership here in CA did not have a direct OEM replacement. I purchased a new one from ZIP. Their web site is listed to the left.
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From: Cape Cod, Mass.
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2019 C1 of Year Winner (performance mods)
2017 Corvette of the Year Finalist
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2015 C3 of Year Finalist
Instructor
Joined: Feb 2008
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From: Roseville CA
Not a great replacement from ZIP. If you're looking for original, the orginal seams to be a pressed part (cap housing with pressed lettering). The replacement fron ZIP was engraved/etched. Looks ok but, I can spot the difference with bad eye sight at 20 feet. We'll see if it holds this weekend. At least the lead from in it from China should not hurt the system. I guess it is better than the local auto parts store.
Any beeter matched out there guys?
Any beeter matched out there guys?