Question about 1993 Jeep Grand Cherokee

2 Answers

Wont aswitch off defrost mode for anything, wont switch to vent or heater

Posted by on


2 Answers

  • 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
  • 17,970 Answers

I suggest checking the information that corresponds to the manual: 93ZJ_Secc_24 Heating and Air Conditioning

Good luck!!!

Posted on Aug 26, 2008

  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that has over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 25 Answers

You have the exact same problem i did. there's vacuum tubes behind the control panel (if i remember correctly the tube i had was black) and it will most likely be hiding down in your mess of wires as mine was, and you'll either need to photograph the tube and the vacuum connection hub and i'll walk you through what to do with it, or you can buy the haynes jeep manual for your specific year and style and it will be under cooling, heating and air conditioning systems (3-13) if you get the 1993 thru 2004 manual.

Posted on Aug 21, 2008


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.
Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


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



Related Questions:

2 Answers

The air conditioner is blowing from the windshield studded vent

You have a loss of vacuum from the engine or the vacuum switch located in the mode control in the dash is defective or leaking or disconnected, pull the heater/AC control out and see if you have vacuum at the switch. The reason it only blows at the defrost vents is that the system is designed to "default" to defrost if vacuum is lost to the heater control mode switch.

Apr 07, 2017 | Cars & Trucks

1 Answer

Heater control wont switch to the defrost

In your HVAC unit there are at least two 'doors' that are moved by servos. (1) regulates your temperature - the blend door, which adjusts/blends the amount of air coming through your heater core and your air conditioning evaporator. (2) regulates where the air goes - the mode door (there may be multiples of this depending on your model, etc), that selects floor, dash vents, and defroster vents. One of your servos may be bad, or your mode door may be jammed.

Jan 20, 2016 | 2001 Dodge Intrepid

2 Answers

1998 chevy blazer heater problems. wont switch from defrost to floor. stuck on vents right now. how do I fix this problem.

Most likely either the vent switching mechanism is dirty and won't switch the flaps -or- most likely the vacuum that is used to turn the vent flaps is either leaking and not pulling enough vacuum. You will have to get underneath the dash near the center, to check and see if you can manually move the vent flaps. If so, then most likely it is a vacuum leak in a vacuum line to the flap mechanism.

Dec 02, 2014 | Cars & Trucks

1 Answer

05 malibu heater vents blowing incorrectly

The are two controls on the heater. One is the blend door and that controls hot and cool, the other is the mode selector door and that changes the place air comes from. You should be able to see those and the area that controls the air in the plenum. The plenum is behind the glove box. Open the glove box all the way and see if the controls are visible. Activate the mode control to see if the lever moves on the plenum, the problem could be anything from a broken lever, bad control, loose control, or something that fell down the defrost vents.

Feb 20, 2014 | 2006 Chevrolet Malibu

1 Answer

Heater control panel doesn't work properly

You are not getting vacuum to the switch or the vacuum motor that switches it on the heater is bad.

Oct 06, 2017 | 1989 Mercury Grand Marquis

1 Answer

2002 suburban wont switch from vent to any other position already changed heater control (auto climate control w/o display)

It sounds like the mode actuator is defective. It is what changes the different modes, floof,vent,defroster.

Sep 08, 2009 | 2002 Chevrolet Suburban

1 Answer

1999 f350 ac blows from defrost vents instead of ac vents

check for a vacuum line that has fallen off the diaphram vacuum "switch can" near the vent shift lever at the heater box under the dash passenger side

May 28, 2009 | 2000 Ford F350 Super Duty Super Cab

1 Answer

Heater works ok but wont send air thru defrost vents

check the control knob it may appear to be working but is not turning the actual controller

Jan 01, 2009 | 1995 Pontiac Grand Am

Not finding what you are looking for?
1993 Jeep Grand Cherokee Logo

143 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts


Level 3 Expert

79186 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Kevin Daniels

Level 3 Expert

1455 Answers

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

Answer questions

Manuals & User Guides