LS1-450

iTrader: (33)

So........, I drain the coolant, add some radiator flush, fill the system, & start the car. Long story short, the car over heats. Air pocket in the pump doesn't allow fluid to circulate....damnit! Both head gaskets leak now as evident by the steam & milky residue in my oil fill cap & PCV lines. Am in the process of pulling the heads.

Question is, what are you guys doing to ensure the pump is filled & no air in the system? Am considering an electric water pump just so the system can be filled & purged without running the engine.

777

iTrader: (21)

Well when I fill my radiator back up after I drain it I take off the hose that goes from the little coolant pipe to the throttle body and pour in coolant until it starts to come out of that hole. I then put the hose back and keep filling the coolant. I then leave the cap off and start the car. Let the car come to full operating temperature (until coolant starts to go through and fans kick on) then I just keep filling until it's topped off. I then shut everything down and put the cap back on. I'll check it after a couple days and add as need be.

Sounds like you have more issues though. Like a blown head gasket or both of them.

Mike K.

exactly what he said if you remove that little hose that goes to teh TB you can top it off and force the air out.

blazinws6kush

http://www.installuniversity.com/ins...sity/index.htm

Go to 160 degree thermostat install. It will show you an easy way that you should have done to remove air from cooling system when refilling.

WhiteRhino

iTrader: (6)

Just to add another thing I do.I turn the heater on to have fluid moving thru the heater hoses/core as well.Which I think it always flows anyway.Not sure if it matters,but I always do that as well as whats mentioned above.

LS1-450

iTrader: (33)

The biggest problem is that the water pump is the high point in my car. That little heater hose is the high point in a conventional set up. I'm gonna have to vent the pump in order to ensure that the air has been removed.

Am breathing easier now, both heads removed & no major damage. Thanks for the comments.

John_D.

iTrader: (2)

Do you have functional steam/crossover pipes on the front of the heads? Or are all 4 blocked off?

LS1-450

iTrader: (33)

Yes, And that's a good point (similar to the TB hose). Problem is (& I didn't explain clearly above) the radiator fill is lower than the pump & the cross over pipes. For this reason, I can't use the radiator fill point to overflow the TB tubing or cross over pipes. Could either fill the remainder of the system throug those tiny ports or drill & tap the top of the pump to be absolutley sure of a full fill.

Edit:
Is there any benefit to connecting the rear head ports also? Have had a real close look @ the heads & block; both look great. Other than the blown gasket(s), there was no damage done. Actually, am glad to have had the chance to look inside. Only dissapointment was all the carbon deposits on the top of the cylinders from either the EGR or from oil introduced into the combustion chamber before the PCV mod.. Cleaned it all up & am in the process of drying out the bolt holes.

SgtB

iTrader: (3)

turn the heater on and use the "air-lift" tool.....I use it every time I drain the coolant on an fbody and have never had an issue.