Blower does not work on high - JeepForum.com

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post #1 of 21 Old 05-06-2011, 06:33 PM Thread Starter
josh_br
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Blower does not work on high

In my 1997 Wrangler, the heater blower fan does not work on high. It works on speeds 1-3, but when I switch it to high it kicks off. I have heard of this happening, only backwards, and the resister being the problem. But I have not heard of the problem happening this way. Does anyone have any ideas? Thank you!


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post #2 of 21 Old 05-06-2011, 06:40 PM
AntiPrius
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Mine was acting like that too. I had to buy a whole new switch from the dealer, but I don't think it was all that expensive. Mine was melted some on the back side. If yours is, you'll probably need to replace it.

I found out for sure it was the switch by removing it and jumping a wire to all of the speeds on the back of the connector and they all worked, so I knew it was the switch.
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post #3 of 21 Old 05-06-2011, 06:51 PM
97tjtom
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check for this on the back of your blower motor on the passenger side footwell. i ended up cutting a connector from a junk yard tj.







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Past: 1999 XJ 4.0 Auto, 1993 XJ 4.0 5 Speed, 1997 TJ 4.0 5 Speed, 1994 XJ 4.0 5 Speed, 1993 Cadillac Sedan Deville 4.9L V8, 1991 Isuzu TrooperII 2.8L 5 Speed
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post #4 of 21 Old 05-06-2011, 09:54 PM
2003X
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Its your "blower motor resistor". It needs to be changed. Its not hard to do, but its a PITA.

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post #5 of 21 Old 05-06-2011, 10:14 PM
AntiPrius
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Quote:
Originally Posted by 2003X View Post
Its your "blower motor resistor". It needs to be changed. Its not hard to do, but its a PITA.
Mine acted similar and it was the switch assembly, not the resistor. Like I said earlier, just pull the switch assembly out, disconnect the connector on the back and use a wire to jump from ground to each wire (speed). If they all work, it's the switch. If they don't, it's probably the resistor.
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post #6 of 21 Old 05-06-2011, 10:35 PM
freeskier93
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It's not the resistor, the resistor only controls settings 1-3. Check the dash switch and relay.
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post #7 of 21 Old 05-06-2011, 10:37 PM
Curly5759
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Check the 40a fuse (#11) in the PDC under the hood, and the blower relay mounted on the a/c box under the dash. Both are used for High blower speed only. Lower speeds use fuse 8 in the fuse block.
If the connector for the switch is melted, it could be a sign that the fan motor is drawing too many amps and is close to the end of its life. I'd replace the connector and have the fan motor amp draw tested.

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post #8 of 21 Old 05-07-2011, 06:44 AM Thread Starter
josh_br
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All fuses are ok, but thanks Curly. Let me do some testing at the switch, see if the switch is bad. Like Freeskier93 said, I think when the resister goes back, settings 1 - 3 do not work but 4 does work. I'm having just the opposite. I don't believe the resister comes in to play on setting 4; I think it just lets the fan full-power. Maybe it's something with the switch or wiring. When I switch it to 4, I can hear the relay click off.

Thanks all; I'll try to let you know how I make out.

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post #9 of 21 Old 05-07-2011, 07:39 AM
micklock
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Mine did the same thing, if I pushed in on the switch high would work. I got a new switch for 24$ from a dealership and it's been working fine for a couple years now.
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post #10 of 21 Old 05-07-2011, 08:56 AM
77midget
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I don't think it is the blower resistor, and here's why. I have a melted resistor harness clip just like pictured above, and a bad resistor switch. The resistor switch knocks out speeds 1-3 when dead. Mine is not even plugged in right now, as I have not re-wired it or replaced the resistor. My High speed works fine.

without looking at the diagram, I think the way it works is that the switch supplies direct current to the motor on '4', but shunts it though the resistor for 1-3. based on the wire feed for the motor, which i also checked, this seems to make sense.
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post #11 of 21 Old 05-07-2011, 11:11 AM
Curly5759
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The switch activates a relay in position 4 (high), the relay feeds the blower off of a 40 amp fuse in the PDC, seperate from the fuse for the lower speeds.

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post #12 of 21 Old 05-07-2011, 01:50 PM
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Quote:
Originally Posted by 77midget View Post
I think the way it works is that the switch supplies direct current to the motor on '4', but shunts it though the resistor for 1-3. based on the wire feed for the motor, which i also checked, this seems to make sense.
The HVAC switch supplies resistive ground, not power for the blower motor in positions 1, 2 and 3...
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post #13 of 21 Old 05-07-2011, 03:40 PM
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Quote:
Originally Posted by freeskier93 View Post
It's not the resistor, the resistor only controls settings 1-3. Check the dash switch and relay.
I beg to differ.

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post #14 of 21 Old 05-07-2011, 04:21 PM
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Quote:
Originally Posted by Knuckelhead View Post
The HVAC switch supplies resistive ground, not power for the blower motor in positions 1, 2 and 3...

ahh. a more correct way of phrasing it. thank you Knuckelhead.
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post #15 of 21 Old 02-08-2013, 09:27 AM
autopc25
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Quote:
Originally Posted by micklock View Post
Mine did the same thing, if I pushed in on the switch high would work. I got a new switch for 24$ from a dealership and it's been working fine for a couple years now.
I was told by the dealer the switch is not available. They said it was part of the entire control. Do you have A/C? Do you have the part number?
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