Question about 2005 Lexus LS400

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Lexus LS400 1996 heater not warm

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.

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  • Anonymous Mar 18, 2014

    steroe light not working lexus ls400

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Add coolant to it then check it should solve it

Posted on Apr 30, 2012

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Check your coolant level sounds like it might be low.

Posted on Nov 29, 2008

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My heater is blowing cold air when the vehicle is stopped, still blows warm air when car is in motion.


hi there it sounds like the matrix has gone it is at the back of the centre panel at the bottom when the engine is hot touch the matrix to see if its warm

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My 2005 chevy avalanche only blows cold air until i drive then when I stop cold air Agian


One of two things has happened. Either your coolant has gotten really low (easy enough to check) or you heater core is starting to plug up.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

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1995 lexus sc400 heater works while driving. cool air when stopped. help


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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1 Answer

Heater blows cold 91 lexus ls400


Sounds like a thermostat problem replace it

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LS400,1996,replace rear window brake light bulb(s).


THREW THE TRUNK RIGHT UNDER WHERE THE LIGHT IS MOUNTED THERE SHOULD BE 2 WIRES GRAB AND TURN THE PLUG AT THE END OF THE WIRE THE PLUG WITH THE BULB SHOULD POP OUT

Mar 30, 2009 | 1996 Lexus LS 400

1 Answer

Heater blows cold air


With the car warmed up,feel the heater hoses,are they both warm/hot near the firewall in the engine compartment?If they are both warm/hot,then the heater core should have circulation through it and it may be a "blend door" issue in the heater a/c assembly.If they are not warm/hot then the heater core could be dirty and plugged up and needs to be flushed.
If the above does not help,a drain and vacuum of the cooling system and vacuum refill will remove any trapped air.
Sometimes,clamping off the top rad hose and holding the engine rpm at 2000 rpm will force trapped air out of the heater core.(Watch temp gauge when trying this)
Lastly,a NEW thermostat doesn't mean its working correctly.

May 18, 2017 | 2005 Lexus SC300

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