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Old 05-31-2011, 10:21 PM   #1
cueball89
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Join Date: Jul 2005
Chapter/Region: Tri-State
Location: NY
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2003 wrx wagon
black

Default How to test hvac blower motor relay?

Blower decided to die in today's 90 degree weather. The blower itself spins freely, has continuity and spins when I hooked up a 9v battery to it. The blower seems to check out ok. All the fuses look ok too.

The plug going to the blower motor doesn't though, no power going to the plug on any setting. The relay by the fuses clicks when I turn the fan control knob from 0 to 1. I've read about the possibility of the relay still clicking over but not making good contact. How do I go about testing the relay itself? If I want to replace it, is it a universal part I can pick up at an auto parts store, or is it something I have to get from the dealer?
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Old 06-01-2011, 09:28 AM   #2
Jessekrs123
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1984 BRAT

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An easy way to trace the problem is to look for power.

With your air system on, check for power to the blower motor, if power is getting to the motor, but it doesn't spin, the blower motor is bad. If there is no power to the blower motor then...

Check power to the blower motor resistor. If power is getting to the resistor but your blower motor still fails to spin, then your blower motor resistor is bad. If there is no power to the blower motor resistor then...

Check power to the blower motor relay. If there is power into the blower motor relay, but no power to either the blower motor resistor or the blower motor itself, then the relay is bad.

If there is no power going into the relay, then check your blower motor fuses.

I would check the fuses first since it is easy enough to check.

So check fuses > blower motor > blower motor resistor > blower motor relay.
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Old 06-01-2011, 10:14 AM   #3
cueball89
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No power to the resistor either. Swapped around the relays and the fan works. Just need to pick up a new relay. It looks like the fan relay went once before as it said made in Taiwan on it and the relay above it was a denso.

Thank you!
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Old 03-18-2014, 01:34 AM   #4
Kenley89
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So I went through the steps listed above and I do not have power at the blower, I went to the resister I do not have power at the resistor, I went to the relay that I found right up by the blower motor and there is power at the relay. the owners manual has the relay in the fuse box in the engine compartment so apparently there are two relays which is confusing it doesn't mention the one by the blower motor. Anyway I swapped the relays around and I still get the same result. is it possible that the switch on the control is between the relay mounted at the blower motor and the resistor? Any help on this would be much appreciated
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