After you drain the coolant from your automobile and replace it with new coolant, you must purge your coolant system of air coolant bubbles that could collect near the thermostat. This could cause the thermostat to regulate incorrectly and cause engine warping. Each vehicle has a coolant-bleeding valve for purging air, but over time they tend to corrode and become almost impossible to open. If you want to avoid the hassles of replacing the bleed valve, you can race an engine to bleed out coolant bubbles.
Instructions
- 1
Remove the radiator cap from the top of your radiator. If your radiator does not have a cap, remove the cap from the radiator expansion tank located next to the radiator.
2Inspect the fluid level inside the radiator to ensure the level is within one inch from the top of the filler spout. If not, add fluid until it is.
3Start the engine and race (rev) it to a steady 4,000 rpms until the radiator fan kicks on.
4Turn off the vehicle and inspect the fluid levels in the radiator. Expect a lower fluid levels due to air purging from the coolant system.
5Top of the radiator with coolant and race the engine again after you allow the engine to cool off for a period of 10 minutes. Complete this process until the fluid level in the radiator stops dropping.
6Place the cap back onto the radiator or close the lid on the radiator expansion tank.
