Fan/air does not work when either ac or heater is turned on


Asked by Mar 16, 2016 at 12:26 AM about the 1999 Lexus RX 300 AWD

Question type: General

15 Answers


Check the blower fuse first, if thats good then Check your blower motor and the blower motor resistor.

1 of 1 people found this helpful.

where would blower motor be and resister?

3 of 3 people found this helpful.

They are normally located underneath the glove box on passenger side.

2 of 2 people found this helpful.

I checked blower fuse 50amp, looked good. Took out blower motor out, checked it out, works. Where is resistor located if it's the next?

1 of 1 people found this helpful.

The resistor is usually right next to the blower motor. Look for a wire harness that plugs into a plastic base. It should have 2 screws diagonally on either side of the harness. Look for melting or black marks on the circuit board

1 of 1 people found this helpful.

Where can I buy resistor if I need too thats inexpensive? You Recommend?

1 of 1 people found this helpful.

Most part stores carry them, but for a Lexus you're better off going to a Toyota dealer. They will give you OEM parts based off your VIN so it will be the right one.


Thanks TTYL!


Another Question would a blower motor relay be another problem before going to to last process?


You can check that. Find a relay in the relay box with the same part number, for example the A/C compressor relay and swap places. If the blower works then the relay is the problem.


P.S. for curiosity sake, how did you test blower motor to determine that it works? Because if the motor works, the relay is still good


Took it out of car, then used car battery with wires connect which turned fan blades on


which relay would i check? I see Fan1, abs sol, abs motor, fan 3, and fan 2?


The fan relays are for the fans on the radiator. 1 relay for each cooling fan(there should be 2) & 1 that runs both. The blower motor relay is different. Its more than likely the resistor since it worked when u hooked up a battery to it.


where would I find the blower motor relay?

1 of 1 people found this helpful.

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