hi all,

i already did a search and didn't find a really well explained method for burping the system. i just did the block weld procedure and i did everything by the number. i didn't burp my cooling system though, i have bubbles floating to the top of my filler neck now and then. i also hear gurgling in the heater core.

when i start her up i get two types of bubbles, one is single bubbles that are fairly large, the other is a stream of tiny microscopic bubbles that only are apparent sometimes.

i have no ast so i was wondering what an effective way for burping the system would be without involving the ast?
also, how would i know when the process has been completed?
could trapped air bubbles be tiny microscopic streams of bubbles that only become apparent sometimes in the system?

thanks.

 

can I ask why you removed the AST? Just curious.

 

I am hoping that you bypassed the radiator, turbo coolant lines, and TB passages before installing the block weld, otherwise that stuff will clog up those small passages in no time and render them useless.

Remove the throttle body coolant hose close to the firewall, and continue filling coolant into the filler neck until you see coolant leaking out of the TB coolant hose. Reconnect the hose, squeeze the large coolant hose leading to the left side of the radiator a few times, start the car up and run it for a while to get it warm, then let it cool off, and recheck the filler neck coolant level.

After you've driven for a while and you still see the small champagne bubbles rising into the filler neck, you've got a problem...

 

i don't have an open air intake system, i can't easily access the upper radiator hose. is it ok to remove the airbox while running the car and squeezing the hose?

 

Don't try to do it while the engine is running; do it with the engine off. You should be able to reach down between the stock airbox and behind the stock IC (if that's what you have) and squeeze it a few times. The most important area is the TB coolant line, however, since it's the highest point in the system.

 

uh oh. i just fired her up about 5 minutes ago and *pop* a loud popping sound. no smoke, no nothing. so i took her around the block a few times, everything seemed normal. scared the hell out of me, what could it have been?