Question about 2005 Lexus LS400
My Lexus LS400 heater only blows out warm air when the car is moving. If stopped at a light or anything, the air is cold no matter what the temp is set on.
Add coolant to it then check it should solve it
Posted on Apr 30, 2012
Check your coolant level sounds like it might be low.
Posted on Nov 29, 2008
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Heater cold when at idle: Try stopping on a steep incline--does the heater stay warm? If yes, what you have is an air bubble that hangs at the heater hose until pressure from the water pump blows thru it as the engine speeds up. Park on an incline, open the radiator cap, run the engine until the thermostat is open, and fill the radiator to the neck. Wait until the level stops dropping and make sure bubbles don't continue to come up. If they do, you may have a blown head gasket that will keep forming these bubbles until you change the gasket. Please let me know if you have questions.
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