Ed Blown Vert

iTrader: (2)

Brand New Engine. But losing about a cup a week of coolant.

Before I pull my heads to check my head gaskets. Anything else it could be?

Its doesn't leak coolant and no white smoke out of the exhaust.

REDWS6ROCKET

iTrader: (4)

if there are no visible leaks has to be internal. possible heater core also?

98SS Blackattack

It is probably going into the oil. Check under your filler cap. If it has a white foamy build up thats the sign. You can tell if you drain your oil but its not easy to see. I had 2 3rd gen engines do this..Both where bad head gaskets..It doesnt alway go into the combustion chambers it sometimes finds an oil passage..

orangeapeel

iTrader: (18)

You will know for sure the moment you crack a head bolt loose. I would see if your radiator has a small drip that you would hardly notice. Chances are it is evaporating if it is on the motor itself. Could very well be a blown headgasket, or the early signs of one about to really let go on you.

Ed Blown Vert

iTrader: (2)

The oil is very clean. I'll take a look at the filler cap.

The radiator is brand new too. But will look at that too.

I run ARP Head Studs so didn't think it would be head gaskets.

But you never know.

orangeapeel

iTrader: (18)

Might be getting blow-by on your radiator cap. If only it were that easy.

ezrollin

you could always get the cooling system pressure tested. Autozone rental tool.

orangeapeel

iTrader: (18)

I am going to go with it being your satanic rear wheel horsepower.
666.0 RWHP - 734.2 RWTQ - 150 Shot

ninobrn99

iTrader: (8)

have you notice any coolant on your kmember and the tranny lines that run in front of it?

CHRISPY

you probably just pushed a head gasket a little bit. I had that happen on my 360ci combo.

Pressure test will tell you a lot

Billiumss

iTrader: (11)

Mine did the exact same thing 2 years ago, I had a small head gasket leak into the cylinder. You could see a small spot/mark on the head/gasket/block where it was leaking.

I thought I had air in my system due to adding a EWP. I was on the dyno when it let loose after the dyno pull, it sucked it out and then I got white smoke on the decell, high vacuum.

Time to tear it down....

Ed Blown Vert

iTrader: (2)

The temps are hotter than normal, so I will have to guess its the head gaskets. At least I hope thats all it is.

I will do a pressure test just in case.

dalejr8ls1

iTrader: (1)

Sound like a head gasket to me, yank them heads off. What gaskets are you running?

Ed Blown Vert

iTrader: (2)

Gm Mls 6.0

Ed Blown Vert

iTrader: (2)

I tested it with a pressure tester. Pumped it up to 18 psi. After letting it sit for 15 minutes it dropped to 17 psi and held.

Ed Blown Vert

iTrader: (2)

Tested everything one more time tonight. Everything held pressure.

So this time I capped the radiator and turned off the fans. Got the temps up to 210. What do you know, it started leaking at the cap. I guess the cap didn't like the SLP radiator

Bought a new cap from Napa. No more leaks. :yay: I am letting it cool down tonight. And I'll see if the level stays up. :xfingers:

slowpoke96z28

iTrader: (2)

if it leaked enough to suck the overflow dry and let air in the system, i'd recommend getting the system flushed and put some fresh coolant in there. there are a few things to consider, like how long have you had this problem, whether or not the car is operated in dusty climates and the age of the coolant now. the problem a flush would prevent is any trash that got sucked in the system sludging it up and causing a problem later on down the road. just having been a bad radiator cap, i think you'll be okay if you dont, but if you are the type to be specific about vehicle maintenance, do the flush to be on the safer side.

Ed Blown Vert

iTrader: (2)

The overflow never went dry. The engine would push coolant into it. And suck some of it back. My guess is it also sucked some air though the leaky cap. Which I hope that is why the level was low.

I have only had the problem for a few months. I don't drive the car that often. Usually I am just racing it.

I run distilled water and water wetter, so I think I am ok and shouldn't need to flush it.

Thanks.

strokedls1

iTrader: (1)

I would recomend a stant radiator cap. Most of the junk they sell at the auto parts store won't hold pressure brand new.

Ed Blown Vert

iTrader: (2)

Who sells Stant?

According to Napa, theirs is a stant.