Idle runs faster when turning the heater fan on - Toyota Nation Forum : Toyota Car and Truck Forums
Corolla 8th Generation (1998-2002) Specific discussion of the 8th generation

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post #1 of 7 Old 05-03-2019, 12:13 PM Thread Starter
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Idle runs faster when turning the heater fan on

Hi guys i was wondering why the idle runs faster of 300 to 500rpms when i turn my heating fan on, no matter if the heating is on or not, as soon as i turn the fan on the rpm goes up... 2002 corolla thanks in advance!
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post #2 of 7 Old 05-04-2019, 12:13 PM
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Is the A/C also on? If you are in defrost mode the compressor might be/probably is running even without the A/C light lit.
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post #3 of 7 Old 05-04-2019, 11:54 PM
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Read that the car will turn the AC on if the dial is set to Max heat. Just turn it back one click and ensure the AC is off. Still high rpm when you turn it on then I'm unsure.
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post #4 of 7 Old 05-05-2019, 01:02 PM Thread Starter
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The a/c is off and the light works great its only when the fan is on no matter what position it is at the second i put the current of the fan on it goes up
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post #5 of 7 Old 05-27-2019, 03:42 PM
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Quote:
Originally Posted by G_gazoo View Post
Read that the car will turn the AC on if the dial is set to Max heat. Just turn it back one click and ensure the AC is off. Still high rpm when you turn it on then I'm unsure.

Why would the car turn on the AC system at max heat?

1995 A131L 4AFE Toyota Corolla
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post #6 of 7 Old 05-27-2019, 04:38 PM
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The AC can also remove moisture so at Max heat it turns on to remove condensation. I am not an HVAC guy hopefully someone else can explain it better if you need. Just go max less one click and the AC will stay off.
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post #7 of 7 Old 06-05-2019, 08:11 AM
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what he said is correct the ac system de-humidifies the vehicle so when defrost is on it has to get all the moisture out of car. but mine does the high rpm too
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