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#1 (permalink) Old 04-04-2013, 11:14 PM
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Fan Switch/Fan Button

Hello All,

I have a 97 Rav 4, 2.2L 4 Cyl whose fan speed works except for one level. It is not a huge problem, but that level seems to be where we would most like to have the fan speed set at. When we move the fan speed to high, it is a little to loud for us, the next setting down does not work, the 3rd setting down works fine but is quite strong enough. Thus I am wondering what part I would need to replace. AC & heat work fine & again, the fan works/blows fine at all the other settings other than the one. Any ideas?

Thanks in advance.
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#2 (permalink) Old 04-05-2013, 08:31 AM
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It's almost certainly the blower resistor which is probably mounted on the underside of the blower housing. Easy & inexpensive fix.

Fred
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It's the pedal (or the handgrip) on the right!!
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#3 (permalink) Old 04-05-2013, 09:51 AM
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Quote:
Originally Posted by Dr. Dyno View Post
It's almost certainly the blower resistor which is probably mounted on the underside of the blower housing. Easy & inexpensive fix.
That was my first thought as well, but in this case the OP is saying that the highest and lowest speeds are working. It is only an intermediate speed that is not working.

The resistor pack is a group of resistors in "series". As the fan speed selector is moved through the positions from high towards low, it effectively adds more resistors to the string. If the fan stopped working at one speed it should not work at any lower speed if one of the series resistors was open.

I would still recommend that you check the resistor pack, but more specifically look for one of the connected wires to be burnt off, or the connection is corroded. If you find no problem there, then I would suspect the speed selector itself.

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#4 (permalink) Old 04-05-2013, 10:24 AM
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Originally Posted by Rickl View Post
That was my first thought as well, but in this case the OP is saying that the highest and lowest speeds are working. It is only an intermediate speed that is not working.

The resistor pack is a group of resistors in "series". As the fan speed selector is moved through the positions from high towards low, it effectively adds more resistors to the string. If the fan stopped working at one speed it should not work at any lower speed if one of the series resistors was open.
That occurred to me too, the series resistors. Max speed bypasses the resistors. But the second highest speed resistor failure should take out the lower speeds too. Not having a schematic I wasn't sure.
Anyway it's easier to check than the switch which may be the problem except I'd think it could have been made to work by "wiggling" it around the bad speed at least for a while.
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#5 (permalink) Old 04-05-2013, 11:29 AM
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Dr. Dyno is correct. If your speed adjustment switch was the problem, you probably would have noticed the fan cutting in and out as you wiggled the switch. This would have gone on for sometime before failing to work entirely.

Here is a picture of a typical resistor pack. The coils, which are the resistors, are inserted into the blower housing so that the resistors are kept cool by the moving air. Your vehicles wiring harness connects to the side not visible in the picture.

To test the pack, connect one lead from an ohmmeter to one of the end contacts, and measure the resistance to each of the other contacts as you follow the path of the coils. The resistance should increase each time you move to the next contact. If the resistance goes to infinity then you have a bad resistor pack.
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#6 (permalink) Old 04-05-2013, 02:53 PM
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Fan Switch/Fan Button

Thanks Guys for all the help. I will definitely look into this as soon as I return to the US (currently out of the country at the moment). Your help is greatly appreciated. I had not tried to wiggle the speed selector but I can say that the position where the fan does not work at, has never worked for us (we are the second owners). Thus even when passing by it or stopping on it, the fan has never worked there but always at the positions above & below it. Again, thank you guys very much!!
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#7 (permalink) Old 04-01-2014, 04:04 PM
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Interesting, my switch only works on high, 1 and 2 don't work at all.
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