Question about 1999 Jeep Wrangler

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99 Wrangler blower for ac/heat will only blow on the 2 lowest speeds. Changed resistor but that did not correct problem. Suggestions

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Mine only works on the highest setting, did you figure this out yet?

Posted on Aug 01, 2009

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I had a simlar problem, and they had to replace the entire fan switch assembly. Apparently they go bad sometimes. They did that and it now runs fine again. Didn't cost too much either...

Posted on Aug 10, 2009

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Meaby the realy or the blower motor

Posted on Jun 25, 2009

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Posted on Jan 02, 2017

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1 Answer

What is an AC diode fuse? I have a 2006 AWD Pontiac Torrent the AC/Heat doesn't work, I've changed all fuses for the HAVAC and still no AC/Heat blowing out of vents. What could be the problem?


Could be a number of thing's ! Testing the electrical circuit is the way to find out what's wrong . Using a wiring diagram and a DVOM - digital volt ohm meter . Videos on youtube showing how to test it ! Without testing i would only be guessing . Does it work in high speed ? In high speed it by-passes the resistor . If it doesn't work in any speed more then likely the blower motor is the problem !
Air Speed
The HVAC control assembly applies ground to the blower motor control circuit that corresponds to the selected blower speed. The resistors and the blower motor are in a series circuit. The following list represents the number of resistors in series with the blower motor per particular speed request:
• Low speed--3 resistors
• Medium 1 speed--2 resistors
• Medium 2 speed--1 resistor
When the operator requests High speed, the HVAC control assembly applies ground directly to the blower motor through the high blower motor control circuit. The resistor card has a fusible link which, if blown, will require that the card be replaced.

Blower Motor and Resistor Diagnostics by Wells

Jun 11, 2017 | Pontiac Cars & Trucks

2 Answers

2001 Jeep Wrangler heater blower stopped working


Yes I would go with the switch, BUT, does it have a resistor bank? That is, how does it reduce the speed? Many systems use resistors to lower the speed. Burnt or bad connections can cause this as well.
You can test the blower motor by connecting direct power from a source like the cigarette lighter if you are handy.
Most of the time the lower speeds konk out but the high speed continues to work this is the resistor bank that goes out.

Mar 25, 2010 | 2001 Jeep Wrangler

1 Answer

Blower Motor Speed - It was suggested


BJ
I'm using the comment section of the original posting to communicate with you.
Pat

Feb 25, 2010 | 1999 Jeep Wrangler

2 Answers

Blower speed question (ac/heater). This just


This is definitely 100% the Blower Motor Resistor.
Replace this and all speeds will work fine.
This Resistor is defined with 3 to 4 wires going into it, and is located adjacent to the Blower Motor.
It is easily access, removed and replaced.
I will post an additional comment on Part Number, Price and where available.
Let me know if this helped, or if you have additional information or questions. Feel free to contact me at FixYa.com!

Feb 19, 2010 | 1999 Jeep Wrangler

1 Answer

I have an 01 wrangler and the ac/heater only blows on high. i just changed the switch that changes it and it still doesnt work


You have to change the resistor, it's located in the blower housing under the dash. It looks like a plug with 2 or 3 little screws holding it in, it has different lengths of wire inside it that creates your different speeds

Dec 15, 2009 | 2001 Jeep Wrangler

1 Answer

1998 Chevy Cavalier z24 heating/AC fan only runs on the lowest speed, how may I get it work on the other 2 speeds?


Replace the blower motor resistor. It is next to the blower motor.Should be on the passengers side under the dash panel.Good luck.

Nov 18, 2009 | 1998 Chevrolet Cavalier

2 Answers

AC only works on settings 3 & 5


souns like a bad blower resistor.the resistor controls the different speeds.sometimes every speed except the highest will stop working.the blower resistor is almost always near the blower motor.

Sep 03, 2009 | 2004 Chevrolet TrailBlazer

3 Answers

05 jeep wrangler no air/heat when blower is on low


sound like you have a bad blower resister some have a module next to the fan on the passenger side by your feet there is a resister that is inserted in to the blower box or black box that is a module that is inserted that neads to be changed

Nov 21, 2008 | 2005 Jeep Wrangler

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