Question about 1996 Jeep Grand Cherokee

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96 Jeep Grand Cherokee 4.0 on the AC heater control what color is the main vacuum line coming to the back of the controls

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: jeep wont shift right

No, it is for the speedometer only. The cable that runs to the throttle from the transmission needs adjusted.

Posted on May 16, 2009

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wireguy212
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SOURCE: 96 jeep grand cherokee hatter has defrost only .

Check the sticker under the hood on the rad support or on the firewall,it should lead you to the problem.

Posted on Dec 15, 2009

  • 37 Answers

SOURCE: 99 jeep grand cherokee, Defrost heater does not

check the fuse.

Posted on May 05, 2010

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SOURCE: vacuum routing diagram from the heater/ac control unit for a 1986 chrysler fifth avenue

there should be a label underside of the hood showing this but as vehicle is a bit oldish may not still be there follow this link you should find yours there
Repair Guides Vacuum Diagrams Vacuum Diagrams AutoZone com

Posted on Jul 07, 2014

  • 314 Answers

SOURCE: No temp display on heater in a 2009 jeep grand

I know the last thing you want to do is take in in to the dealer but in this case its probably the best idea to get it repaired properly. If you insist on going it alone, you can always buy another HVAC control on eBay or somewhere like that and replace it. 50/50 chance it will fix it.

Posted on Nov 29, 2014

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1 Answer

2001 jeep grand cherokee larabo 40 vacumm line broke going thru fire wall looking for a fix that doesnt require removing the hole box


That would be the vacuum line going to the heater/AC control head, so you could pull out the HVAC controller, find the main vacuum line coming from the engine, and splice, with new connectors and new line as needed, the line back together.

Jun 17, 2017 | Jeep Cars & Trucks

2 Answers

Fa goes off when ac on thn comes back onwhat may be wrong 1999 jeep grand Cherokee


Check for melted wires or connector at the blower resistor. It's located near the blower motor which is under the dash above where the passenger's feet go.

Mar 04, 2015 | 1999 Jeep Grand Cherokee

1 Answer

Ac problems


You have a vacuum problem. There is a check valve inline with the AC controls vacuum line from the engine. When it fails the door will move during acceleration and deceleration which changes the amount of vacuum applied to the door operation.

Jun 30, 2014 | 2002 Jeep Grand Cherokee

1 Answer

My 2001 Grand Cherokee Larado blows ice cold AC but the temp setting will not change over to heat.


Check the control valve on the heater core supply line to make sure the Vacuum line or control cable are connected and that it is opening properly.

Dec 27, 2010 | 2001 Jeep Grand Cherokee

1 Answer

2000 jeep grand cherokee limited with climate controle and 6 cyl. the ac blows cold on the driver side and hot on the passenger side.


If you have duel climate control, it sounds like the blend doors inside the heater box have broke. It is a rather large repair to do. If you don't have duel climate control, look for a broken, leaking or aged vacuum line under the battery try. Hope this helps.

Best of luck

Jun 16, 2010 | 2000 Jeep Grand Cherokee

2 Answers

'98 Jeep Grand Cherokee - My Heat/AC worked intermittently for a few days and now blows only heat. Changing the Heat/AC settings doesn't change the temperature at all. It blows very hot. AC is still...


The control for the AC/Heater door isn't working. To have AC the door has to close so that the hot air is not being blown into the car. When this door is closed it allows the cool air to pass through. This is either controled by vacuum or a ele. switch

Oct 01, 2009 | 1998 Jeep Grand Cherokee

2 Answers

A/c goes from vents to defrost under acceleration


Sounds like a vacuum problem.Listen for hiss noise under hood and under dash. may have a bad vacuum diaphram that controls blend door or leaking vacuum line.

Jul 26, 2009 | 1994 Jeep Grand Cherokee

1 Answer

No cold air just hot


System is vacuum controlled check for vacuum at the switch you replaced If it's there then check the blend door motor (moves the "flapper") If motor is good, then the door is stuck and heater box needs to be taken apart. If no vacuum at the switch, work your way back to the engine where vacuum originates to determine where line is broken or disconnected.

Jul 10, 2009 | 1996 Jeep Grand Cherokee

1 Answer

Panel won't blow


verify u have a good vacuum source at the ac mode control switch, vacuum comes from the engine to a vacuum reservoir tank under the hood and then through the passenger side firewall to dash, if ok pull the ac/heater control and replace the vacuum mode control switch, it is a dealer only part.

May 31, 2009 | 1995 Jeep Grand Cherokee

1 Answer

2001 Jeep Cherokee a/c blows defroster only, no cruise control


There is a vacuum leak under the hood somewhere. Check the vacuum at the speed control servo. If there is no vacuum on the line with the engine running, follow the line to find the leak. The vacuum reservoir is mounted under the battery tray. I would look in that area after confirming no vacuum at the servo.

Apr 27, 2009 | 1995 Jeep Grand Cherokee

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