Originally Posted by Mr.Firemouth
4. Burping the coolant to get air out takes much longer than burping a baby! Still need to get 180F t-stat from Intense.
Congratulations on a job well done!
When you go to install the new thermostat, this procedure will minimize trapped air in the engine, and make bleeding go a lot quicker.
1. Get new seals for the thermostat.
2. If the new thermostat does not come with an air bleed, drill a small (1/16") hole in the flange - like this:
3. Drain a gallon of coolant by siphoning using a small diameter (1/4") hose long enough to be slipped to the bottom of the rad side tank with the other end placed into the bottom of a clean gallon jug sitting on the ground. If you use clear vinyl hose, you will be able to see the coolant coming as you suck the air out of the hose to start the siphon, and avoid getting coolant in your mouth. This method will also keep the coolant perfectly clean so that you can re-use it. If the siphon does not break (stop by itself) before the gallon jug fills, pull the hose up from the bottom of the radiator to stop the siphon. One gallon removed from the system will drop the coolant level enough to change the thermostat.
4. Make sure the bleeder screw will open and close properly.
5. After removing the old thermostat, clean the sealing surfaces taking care not to let debris fall into the thermostat opening.
6. Re-fill the engine with coolant at the thermostat housing until the coolant rises to the thermostat seat.
7. Then, pour coolant into the radiator slowly. You should see air bubbles coming out of the engine at the thermostat opening. Continue filling at the radiator until the coolant level at the thermostat opening begins to overflow.
8. Install the drilled thermostat with the hole at the high point in the opening.
9. Install the upper radiator hose.
10. Finish filling at the radiator, waiting for a few minutes each time coolant reaches the overflow opening in the radiator filler neck until the coolant level no longer falls.
11. Install radiator cap.
12. Fill overflow (expansion) tank to "full hot" or a couple inches above.
13. Start engine. Go for a ride to quickly bring temp up until thermostat opens (top radiator hose hot).
14. With car idling and at operating temperature, open bleeder and rev engine at throttle linkage to about 2K several times. Only coolant should come out of the bleeder.
15. Watch coolant level in expansion tank. Level should stabilize within several days.