Question about 1991 Lexus LS 400

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Heater core how to replace and install heater core for a lexus ls 400

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  • sundragray20 Feb 11, 2010

  • mopardurango
    mopardurango Mar 07, 2012

    Hey bro is there any way you can send me how to replace heater core on a ls 400. Mine is a 91 also and the dealer wants like 350 for the book to tell me how to do it. My email is I would really appreciateit



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Need email address so can send you directions with images to replace heater core

Posted on Feb 07, 2010

  • Brian Miller Jun 08, 2011

    Could I possibly get the same directions with images to replace the heater core on my 1991 LS400? My email is:



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SOURCE: 1990 Lexus ls 400 transmission

yes, no problem

Posted on Apr 13, 2009

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Have the heater coil flushed out to make sure it doesn't clog up. The heater only works if there is coolant flowing through it when the heater turns on. Good luck.

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Lexus heater blows cold

You could have a blocked heater core. Check for two heater hoses running into the firewall in the back of your engine. They should be together and about 5/8" in diaameter. If one is hot and the other is cooler then your heater core is blocked. Unhook both hoses and use a garden hose to back flush. Be sure to catch the coolant and dispose of it properly.

Jan 27, 2009 | 1992 Lexus Ls 400

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