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I have a 1990 Lexus ls400 and barely any air is coming from the vents. The heater core lines are capped off from previous owner. The blower motor strength is good and I also cleaned out the evap core. Still barely any air. The ac/heat controls light up but if I change it to low medium or high air it doesn’t change the fan speed but it must be stuck on high because it spins fast and it’s loud. Ik the blower is moving lots of air and the core is cleared I’m not sure what could be the cause of the lack of air power out of the vents.

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Hi Cody......welcome to the Club

I would advise to check the Cabin (Pollen) Filter as if this blocked then no air will come through.

Cheap and easy to replace but may have to crawl under the dash to access it

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3 hours ago, Lexus Owners Club said:

Hi Cody......welcome to the Club

I would advise to check the Cabin (Pollen) Filter as if this blocked then no air will come through.

Cheap and easy to replace but may have to crawl under the dash to access it

 

You can check for a filter but don't be surprised if you don't find one.  The 1990 LS400 I drove from new to 14 years didn't have one.  The first model year that a filter is shown in the parts list is 1992 but I thought that 1993 was the first model year that the North American market gone one.  The Lexus organization made quite a big deal when the HEPA filtration system became standard on the LS400 in the North American market.  It was an expensive option on the Japanese market Celsior (LS400) in the early years.

Ducts in the HVAC system could be clogged with who-knows-what or electric servo motors that open and close flaps in ducts might have failed or the flaps could be stuck.  It sounds like the HVAC system is in sad shape if a previous owner capped the heater core and the fan is stuck on high.  Debugging the fan speed is further complicated by it being also controlled by the phone system.  Even if no phone was installed, corrosion of the factory phone system prewiring can cause all sorts of weird problems including putting the audio system in permanent mute. 

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