Burping

[mrnickleye]

Ihatehacks Quote: And I really think this crazy "burping" method is a crock, no disrespect to suprra girl or anyone else.

You were lucky with yours. Probably because air did not enter the heater core during the BHG repair.

I've been lucky on mine a couple of times during coolant drains (like radiator swap).

Most are NOT so lucky.

The problem with the MKIII Supra is that the top of the heater core is located higher than the radiator cap.

So, whenever the coolant has been drained, air gets trapped in the top of the heater core. The gurgle sound is the coolant and air bubbling around in the core. This is VERY BAD for the core, as it will cause it to corrode and leak.

To remove ALL the air, you must get the top of the heater core lower than the radiator cap to allow the trapped air out of the system.

MANY cars have places in the cooling system that are higher than the radiator cap, and have to be burped. MANY also have 'air-bleed' screws/valves on the high spot, to let out the air. Usually on the highest place on the engine that has coolant flowing thru.

I usually give mine a few revs (1500rpms) during the process to speed the coolant up a bit, and force the air on thru the plumbing.

NOTE: If you rev too much, it will 'whale spout' when you let back off.

I found that if you stick a piece of folded matchbook in the throttle stop (on the throttlebody), and set the idle to 1000rpm, it works best. This is because the water pump does not move very much coolant at 6-800rpm.