Originally Posted by harofreak00
is there a better way to release the air other than using the valve on the thermostat? I opened it slowly at operating temp and coolant dripped out immediately. I figured I had got all the air.
Theoretically, the air will work itself out of the system as the coolant cycles through expansion and contraction cycles. When this happens, you will see the level of coolant fall in the recovery tank as it is drawn into the engine as the coolant contracts. You will then notice the temperature gauge swing less widely as the thermostat opens and closes. But, sometimes, this doesn't work all that well.
Some rev the engine to about 2k briefly a few times with the car'* front end on an incline to encourage trapped air to escape through the bleeder. Ever since I got a huge bubble trapped in a '97 SSEi, I use a complicated method of filling the engine with coolant that minimizes any air getting trapped in the first place. It is documented here: http://www.bonnevilleclub.com/forum/...=article&k=100
I think that your un-drilled thermostat will add to the problem of bleeding the system. I thought I read here recently where the newest GM thermostats include a bleeder valve. Better late than never. http://www.bonnevilleclub.com/forum/...ic.php?t=89905