Question about 2001 Jeep Wrangler

1 Answer

2001 jeep tj, heater selecter switch changes on it's own,

I believe it is a low vacuum promble, it only happens on the highway when it is working hard, around 2000 rpm,  you can hear it switching on you, when you let the peddle off it will go back to the floor heat, but when driving normal it will always go back to the window defrost,  why?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Jeep Master
  • 6,982 Answers

I'm not sure if this applies to your vehicle but often a vaccuum reserve tank is used in the system to eliminate this problem. If you have one, make sure it's not leaking. If you don't and were supposed to, someone may have removed it. There also may be a check valve in the line somewhere that is malfunctioning. This used to happen on older vehicles with vaccuum wipers. They would almost stop when going uphill. It's the same thing, just on a different system! Could also be a slight bleed-off from a plenum door motor that is not bad enough to not work, but just enough to react to low vaccuum caused naturally when engine is working hard.

Posted on Mar 11, 2009

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

I have a 1997 jeep g c.. about 2 years ago i had to have a heater core put in it. since then i have not had as much heat as i had before. even on high i hardly have enough heat to keep the jeep warm...

You may have a vacuum leak affecting the vacuum supply to the control switch. I don't have the manual for your car, but if you have a vacuum operated valve on your heater hose, that could also limit the flow of hot water to the heater core. Look for the small vacuum line that goes from the engine intake manifold through the firewall to the control switch. Look closely at the connection to the intake manifold, as that is one of the primary failure modes. the other typical failure is the vacuum switch itself. If you can get to back of the control switch and pull the vacuum connector off the switch, check for vacuum on the supply line from the engine with the engine running. If you're getting a good vacuum there, your switch is likely the problem. Let me know if you have more questions.

Sep 13, 2010 | 1997 Jeep Grand Cherokee

1 Answer

2001 jeep Tj pdc diagram trying to locate fuse for

sounds like it is either flasher or switch assembly.

Oct 08, 2009 | Jeep TJ Cars & Trucks

2 Answers

Jeep TJ Heater Fan Repair

blower motor resister has burnt out also check wiring going to your blower motor resistor these must have a good tight connection or they will burn if any sighns of being hot change the complete wiring pig tail to your blower resistor

Sep 19, 2009 | 1999 Jeep Wrangler

1 Answer

P1299 and p0122 codes Jeep Liberty 2002 3.7

P1299 Vacuum Leak Found (IAC Fully Seated)

P0122 Code - Throttle Position Sensor/Switch A Circuit Low Input

Not sure if you have solved this or not yet but these are your error code read outs. They would cause your problems.

Jul 29, 2009 | 2002 Jeep Liberty

1 Answer

1997jeep tj runnung rough

Likely either your thermostat is stuck open or is incorrect one (should be a 195f) , Or, the electric or clutch fan is on too early and not shutting off, or...the temperature sensor is not working and therefore telling the computer that the engine is cold when it's not. If the computer is believing that the engine is still cold, it remains in cold-start mode regardless of what is actually happening.

Jul 06, 2009 | 1997 Jeep Tj

1 Answer

High beam indicator light


Apr 12, 2009 | 2003 Jeep Wrangler

4 Answers

Heater/ac not working properly

Easy fix. The vacuum hose has come loose. Happens all the time. The hose is about 1/2" in diameter and can be found under the hood, in the middle of the engine compartment, on the drivers side. Just take a tie wrap and tighten it down over the plastic inlet.

Jan 05, 2009 | 2004 Jeep Grand Cherokee

2 Answers

1998 Jeep Wrangler TJ Headlights working intermittently

I have a 97 TJ and the headlights wouldn't come on but the parking lights would. Funny thing was that if I pulled the brights to flash someone, the brights would work. I took out the old headlight switch ($26 at Checker) and they work again. When I pulled the switch there was one connector that seemed to be corroded. Hope this helps

Nov 22, 2008 | 1998 Jeep Wrangler

Not finding what you are looking for?
2001 Jeep Wrangler Logo

259 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts


Level 3 Expert

70346 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22041 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6869 Answers

Are you a Jeep Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides