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No fan for a/c or heat
08-23-2011, 07:41 PM
Post: #1
No fan for a/c or heat
'98 Maxima 6 cyl. The fan only worked on speed 3, A/C and heat, now doesn't work at all. I was wondering if I just need to replace the fan switch or could it be a problem with the blower motor? When I turn on the a/c I can hear the condenser running but the fan inside the car doesn't. Now, is the switch replaced through the dashboard or engine compartment? Thank you and if you have an alternate theory I'd love to hear that also
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08-23-2011, 09:32 PM (This post was last modified: 08-23-2011 10:14 PM by Rupe.)
Post: #2
RE: No fan for a/c or heat
The blower is under the dash behind the glove box so pull the plug and check for both power and ground while going through all of the speeds. If there's nothing there double check the fuse panel with a test light. The fuse may have finally blown and you can't get a good diagnosis with a blown fuse.

I suspect the blower resistor is likely the cause and they generally open up (go bad) one speed at a time till all you have is the high speed. It should be mounted right next to the blower with a 4-5 wire connector. I have forgotten if it's snaps into place or has two screws.

Let us know how you make out.
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08-23-2011, 09:42 PM (This post was last modified: 08-23-2011 10:14 PM by Rupe.)
Post: #3
RE: No fan for a/c or heat
(08-23-2011 09:32 PM)Rupe Wrote:  The blower is under the dash behind the glove box so pull the plug and check for both power and ground while going through all of the speeds. If there's nothing there double check the fuse panel with a test light. The fuse may have finally blown and you can't get a good diagnosis with a blown fuse.

I suspect the blower resistor is likely the cause and they generally open up (go bad) one speed at a time till all you have is the high speed. It should be mounted right next to the blower with a 4-5 wire connector. I have forgotten if it's snaps into place or has two screws.

Let us know how you make out.

(08-23-2011 09:32 PM)Rupe Wrote:  The blower is under the dash behind the glove box so pull the plug and check for both power and ground while going through all of the speeds. If there's nothing there double check the fuse panel with a test light. The fuse may have finally blown and you can't get a good diagnosis with a blown fuse.

I suspect the blower resistor is likely the cause and they generally open up (go bad) one speed at a time till all you have is the high speed. It should be mounted right next to the blower with a 4-5 wire connector. I have forgotten if it's snaps into place or has two screws.

Let us know how you make out.




The fuses are good, first thing I checked. I will test the power as you suggest and get back to you asap. Car is not here right now or I'd do it now. Thank you
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08-23-2011, 10:16 PM
Post: #4
RE: No fan for a/c or heat
BTW, on that year I can't recall if the resistor is mounted facing down toward the floor or if it's facing the back side of the glove box. (remove the glove box?)
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08-24-2011, 09:25 AM
Post: #5
RE: No fan for a/c or heat
(08-23-2011 10:16 PM)Rupe Wrote:  BTW, on that year I can't recall if the resistor is mounted facing down toward the floor or if it's facing the back side of the glove box. (remove the glove box?)

How do I get to the blower/resistor? Do I have to take off the whole dashboard to take out the glove box or can I just pull the glove box without too much trouble? Thanks
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08-24-2011, 09:51 AM
Post: #6
RE: No fan for a/c or heat
Nissans are usually fairly easy with a removable panel or just the glove box itself.

If you want a picture of the exact location try http://www.autozone.com and fill in the infor for the specific car, then go to their "parts finder" section. They also have a pretty good "how to" section where you may find step by step instructions.
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08-24-2011, 10:29 PM
Post: #7
RE: No fan for a/c or heat
(08-24-2011 09:51 AM)Rupe Wrote:  Nissans are usually fairly easy with a removable panel or just the glove box itself.

If you want a picture of the exact location try http://www.autozone.com and fill in the infor for the specific car, then go to their "parts finder" section. They also have a pretty good "how to" section where you may find step by step instructions.

OK, so I disconnected the resistor and turned on the fan, to setting #3 which is the only one that worked, and while unplugged the fan came on. I looked at the resistor and it definitely needed replacement, it was rusty around the edges and broken in a few places, but why would the fan come on when it was unplugged? I plugged it back in and was going to go to auto parts store and get new resistor and the fan didn't work again. Any suggestions? I bought the new resistor and installed it but fan still a no go...
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08-24-2011, 11:23 PM (This post was last modified: 08-24-2011 11:25 PM by Rupe.)
Post: #8
RE: No fan for a/c or heat
Sometimes when the resistor goes out so does the switch. It doesn't happen often but it does happen. Now that you have a fresh resistor you should start a fresh diagnosis. Does it work on high? (that means a good ground and a good motor) At this point you'd need to pull out the switch assembly and check it with a test light or meter.

I'll be away for a few days so maybe one of the other guys can jump in if you need more help.

Edited to add: Does the new resistor look like the old one? IOW, are you sure you have the correct part?
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08-25-2011, 12:08 AM
Post: #9
RE: No fan for a/c or heat
(08-24-2011 11:23 PM)Rupe Wrote:  Sometimes when the resistor goes out so does the switch. It doesn't happen often but it does happen. Now that you have a fresh resistor you should start a fresh diagnosis. Does it work on high? (that means a good ground and a good motor) At this point you'd need to pull out the switch assembly and check it with a test light or meter.

I'll be away for a few days so maybe one of the other guys can jump in if you need more help.

Edited to add: Does the new resistor look like the old one? IOW, are you sure you have the correct part?

The assembly, ie screw holes and basic shape are identical but the board is a little different. Parts guy at autozone said this is the correct part and new design. I took his word for it.
As for the switch, why would the fan come on when I unplugged the resistor? As it was unplugged I turned the switch to see what happens. The other speed settings did not work and when I turned it off it never came back on again. Again, fuses are all good and new resistor so still confused. Thank you for all your help, it's greatly appreciated
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08-27-2011, 07:53 PM
Post: #10
RE: No fan for a/c or heat
The problem still exists. I have left the switch in the only position that it worked on before an every once in a while the fan kicks on for a few minutes then off. If I change the fan switch to a different speed it turns off. So to sum it up, I have replaced the resistor and we know everything works, except when you want it to and the fan only works on 1 speed, so I'm thinking maybe it's a short in the system somewhere? Very frustrating...
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