RX - 1st Gen (1999-2003) Discussion topics related to the 1999 -2003 RX300 models

No heat?

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Old 11-05-21, 08:03 AM
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Annehunt
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Default No heat?

Even when the engine is warm my 1999 heat is blowing only cold air. Any advice or insights?

Last edited by Annehunt; 11-05-21 at 08:03 AM. Reason: Clarity
Old 11-05-21, 08:43 AM
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LeX2K
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Is the coolant level in the radiator correct?
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salimshah (11-05-21)
Old 11-05-21, 02:57 PM
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maxSteel
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Originally Posted by Annehunt
Even when the engine is warm my 1999 heat is blowing only cold air. Any advice or insights?
Air mix servo could have failed or become disconnected
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Old 11-07-21, 06:07 PM
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slothman
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99% of the time that means the heater core has failed
Old 11-08-21, 05:30 PM
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maxSteel
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Unless if it was leaking a heater core would be pretty low on my list of possibilities.

Here's a long "no heat" thread https://www.clublexus.com/forums/rx-...-cold-air.html

Post #50 in that thread shows the mode and mix servos and linkage
https://www.clublexus.com/forums/rx-...ml#post5852597
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