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

40

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

Question type: General

15 Answers

685

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

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40

where would blower motor be and resister?

2 out of 2 people think this is helpful.
685

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

1 out of 1 people think this is helpful.
40

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?

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685

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 out of 1 people think this is helpful.
40

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

685

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.

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Thanks TTYL!

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

685

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.

685

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

40

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

40

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

685

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.

40

where would I find the blower motor relay?

1 out of 1 people think this is helpful.

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