does a 99 avalon with automatic climate control have a blower motor fan resistor

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Old 01 Oct 2014, 02:18 pm   #1 (permalink)
Bill G
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Default does a 99 avalon with automatic climate control have a blower motor fan resistor

my fan only runs on low, when the car is started it will momentarily run on
high but then cut down to low. The car has auto climate control.

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Old 01 Oct 2014, 04:20 pm   #2 (permalink)
Jeff Strickland
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Default Re: does a 99 avalon with automatic climate control have a blower motor fan resistor


"Bill G" <065b0505594b06f549b8b6640ba408f1_1292@example.com > wrote in
message news:ddd7f$542c4558$41b57997$16466@news.flashnewsg roups.com...
> my fan only runs on low, when the car is started it will momentarily run
> on
> high but then cut down to low. The car has auto climate control.
>
> --




Yes, the car has a final stage resistor. The typical failure mode for this
item is that the fan speed is off or HI. I do not know for sure how Toyota
implements this feature, but basic electronics says that it should run on HI
even if other speeds have gone away. Basically, the FSR consumes some
percentage of the available power, for example if there are 4 fan speeds,
then the FSR consumes 75%, 50%, or 25%, and when the fan is set to HI, then
the FSR allows all of the voltage to pass, or it consumes 0%.

Consume is arguably the wrong word, but the idea is that Ohm's Law states
that the available electricity is a circuit is based on the load of the
circuit. If the FSR has high resistance, then the available electricity to
the fan motor is low because the load of the FSR is high. If the FSR load is
medium or low, then the fan speed will increase. If the FSR is no load at
all, then the fan speed is maximum.

The resistance of the FSR represents heat, and the heat is destructive.
Since there is no heat when the fan speed is set to HI, this speed of the
FSR lasts the longest. .

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