Lexus Radiator

Vehicle is not equipped with bleeder bolts. Use the radiator cap to bleed. Remove cap with cold egine and top up as necessary.

Close radiator cap and start engine and allow to idle for 5 minutes. Allow engine to cool before opening radiator cap to recheck level. Repeat process if necessary. Check for leaks if coolant is depleting.

If the thermostat is working correctly, the temperature gauge would be constant and does not fluctuate with A/C operating or not.

If you have coolant in system, the thermostat is less likely to require replacement as the coolant is a form of lubricant and protectant for the thermostat.

If the coolant level is very low, top up coolant and start engine, if coolant level drops, top up as necessary. DO NOT run for more than 5 minutes with radiator cap off as the coolant can come shooting out when the thermostat is not open yet while the coolant in engine has heated up. The thermostat requires the system to be under pressure to work correctly.