Hi s. Mulliniks,
When the coolant is drained and thermostat installed, the thermostat would be dry without any coolant to heat up allowng the thermostat to operate correctly.
To burp the air, you need to turn off the engine to allow the coolant to settle in. After that you need to close the radiator cap to for whatever air trapped in system to the radiator cap. Run engine for a short whhile and allow to cool down before opening the radiator cap. Top up coolant and repeat steps a few time to ensure air is completely purged.
If any air is trapped in system, the thermostat would not work correctly.
Sunday, July 4th, 2010 AT 4:46 AM