Question about Lexus RX 300

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I have a 91 lexus rx 300 and the heat is set to hot and its blowing cold. why?

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Check antifreeze level when car is cold, if good it might be a heater control valve, thermostat, or a blown head gasket.

Posted on Apr 18, 2013

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Lexus rx300 1999 not blowing air a/c

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I am having a problem with heat in my 99 RX300. When I turn it on, it blows cold air. I can't seem to get the heat to come on...

Check coolant level, if that is acceptable,, then the problem may be a thermostat or the deflector mechanism inside the heater which should be checked by a qualified mechanic.

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Possible air bubble trapped in the HVAC unit so the heat from the engine is not getting to the heat exchanger

Apr 16, 2010 | 1999 Lexus RX 300

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Heating and AC problem.

I had the same thing on the same model car. Sounded like I had a gerbil living (running around in a little wheel) in my dashboard. I think the replacement part is called an accuator (it is relatively inexpensive) but the whole dashboard has to be removed to put it in. It controls the opening and closing of the vents. Apparently even taking the dashboard off is not as difficult as dealers often indicate - but they bill for a lot of time - so the job is an expensive one unless you do it yourself. I ended up having a friend do it for me.

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you most likely have a bad airmix servo. this happens alot on these. they are expensive to replace too.

Sep 10, 2009 | 2001 Lexus RX 300

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1999 RX 300 Lexus Blower Motor

blower motor bearings going out ,,,replace motor

Jul 04, 2009 | 1999 Lexus RX 300

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1999 LEXUS RX 300

blows hot air all the time even with the ac on???? with the temp gauge on cold???

Jun 16, 2009 | 1999 Lexus RX 300

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Auto heater only blows cold air

hi, this is simply a sensor that has gone bad. your dealer will be able to correct this issue.

Feb 28, 2009 | 2001 Lexus RX 300

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