Bleeding Air Pockets
 

What's the best way to bleed the air from cooling system - I don't want the water to get into the Opti-spark when bleeding - what have ya'll done to keep this from happening.
Thanks

RE: Bleeding Air Pockets
 

I believe there is a bleed screw on the throttle body on the LT1s. You can also try pumping the upper radiator hose some until it fills with water.

RE: Bleeding Air Pockets
 

There is an air bleed valve on the top of the thermostat housing. It faces the pass/side of the engine. A small brass screw can be backed off slightly to vent air from the system. Just barely open it so as not to allow coolant to drip on to your opti-spark. This is done with the engine idling. May take a couple of shots.

RE: Bleeding Air Pockets
 

I checked the raditor through shroud and appears clean - my tempature varies quite a bit. Doesn't really get hot just 195 through 210 when not in traffic. I know both upper and lower raditor hoses were replaced before I bought the car so I think there may be some air pockets. I'll try bleeding the system. Any tips for keeping water away from opti-spark?

RE: Bleeding Air Pockets
 

The few times I've changed the coolant I just barely loosened the bleed screw on the thermo to let any air escape. Did this with the engine running. After shutting down the engine I fill the overflow container to the hot line. You may have to repeat this a couple of times. Worked for me.Some prefer to remove the bleed screw & fill the system until coolant runs out. If you use this procedure make sure you cover the opti.