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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What's the best way to heat my 2004 Lexus RX 330

I have an ES330.

In cold weather you have the AC button off. The Auto button heats (and in summer cools) the vehicle automatically. You just adjust the temperature up or down. Mine is set to 23'C. Then you can select Manual Settings, where the heat or cold comes from and the fan speed. There is also a Windscreen defrost setting which only blows to the windscreen.

Your manual is here

The features of the vehicle's air conditioning and audio are
explained in detail.
Be sure to read this Section so that you can
make full use of them

2004 Lexus RX 330 Owners Manual


Owner's Manual, you can get from Sign up as a Lexus Owner and you can download the Owner's Manual.

Nov 27, 2017 | Lexus Cars & Trucks

1 Answer

Lexus rx300 1999 not blowing air a/c

Check for power from the supply to the thermostat, to relay, to AC

Sep 12, 2015 | 1999 Lexus RX 300

1 Answer

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.

Sep 23, 2011 | 1999 Lexus RX 300

1 Answer

Rx 300 lexus 1999 air condition blowing hot air

Might have a freon leak, take it to local mechanic so they can test for leaks w/ a special device

Feb 03, 2011 | 1999 Lexus RX 300

1 Answer

Heater doesn't work with my 2000 Lexus RX 300. a/c works fine but no heat even when I set the temp to 75 or higher

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

1 Answer

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.

Nov 17, 2009 | 2001 Lexus RX 300

3 Answers


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

3 Answers

1999 RX 300 Lexus Blower Motor

blower motor bearings going out ,,,replace motor

Jul 04, 2009 | 1999 Lexus RX 300

2 Answers

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

1 Answer

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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