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2001 Lexus IS 300 Base 4dr Sedan

2001 Lexus IS 300
Trim Info:
Rear Wheel Drive, 4 Door Sedan, Mid-Size
18 mpg city / 23 mpg hwy
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December 7, 2010, 6:25 pm


Question: Heater Controls "stuck"?

When I start the car, there is a noise that sounds like an air pump coming from the frond dash. The air that comes out is not hot, regardless of water temp. Could there be a motor or vacuum positioning that controls the vent for comfort heating?

December 8, 2010, 1:52 pm

Elizabeth K

Yes, the vent doors have vacuum actuators. Here's a thread with some more info:

1/1 users found this helpful.

December 8, 2010, 6:17 pm


Your response was right on the button. I went today and they found a "air mixing actuator" was not responding. Cost of the actuator was 165.00 and the labor was 150.00. The actuator was inside the dash behind the glove compartment..... a real booger to get to and NOT a job for me. Thanks for the help.

1/1 users found this helpful.

December 12, 2010, 8:56 pm

Elizabeth K

Your welcome. Thanks for posting the result.

0/0 users found this helpful.

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