Question about 1996 Jeep Grand Cherokee

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My Ac blows through the defroster when i press the gas.

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  • Jeep Master
  • 7,689 Answers

You may have a vacuum leak. Check the vacuum line that comes from the engine intake manifold thru the firewall to your control console. Especially check for brittle hose where it attaches to engine. It can also be a leaky control switch.
The system mode doors are vacuum operated and default to defrost when the vacuum supply fails. Let us know if you have more questions.

Posted on Oct 01, 2010

Testimonial: "Thank you very much ill be sure to check it out tomorrow when i have more time to take a better look at it in the light."

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  • Jeep Master
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This is caused by a loss of vacuum from the vacuum storage canister under the hood behind the passenger headlight, check it.

Posted on Oct 01, 2010

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Posted on Jan 02, 2017

Mr BrokRench
  • 1623 Answers

SOURCE: ac f 150 ford truck

Hello santillani...the a/c duct routeing is controlled by a vaccum operated damper... the defrost, is the systems default mode. Sounds like you could have a vaccum line leaking or broken, or the linkage on the damper itself is not properly working. Also...on the later 90 model fords pickups, there is a 3-way vacuum valve behind the battery next to the firewall that i've found faulty, i would check that first, bout 8 buxs to replace it.
TIP: While you are under the hood, do a general inspection of all the rubber lines, hoses and belts, pcv valve and connector line. Your truck is 12 years old so a lot of rubber products may start to show deterioration.
Good luck...i hope this helps and will fixya up.

Posted on May 16, 2009

jmgldsmth
  • 1869 Answers

SOURCE: 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

Posted on May 28, 2009

  • 2 Answers

SOURCE: ac only blows out floor and defrost vents 95 camaro

Could it be a possibility that your switch is broken to that setting. Try popping off the knob with a screw driver, taking pair of pliers and twisting the knob. Feel for it switching settings.

Posted on Apr 17, 2010

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My lexus rx 300 fan/ac is blowing on the wind-shield only and does not blow throuhg the instrument panel. what could be the cause?


How long have you been driving or owned a car? Your A/C is set on front "defrost" instead of main. Turn off the defroster for the front and select the switch to read "main" or if your A/C panel uses icons to display, press the one where it looks like the airflow is blowing air (represented by arrows) towards you and not the windshield. The arrows on your buttons or electronic display refer to which way the air is flowing. Choose the one you want where the arrows show the airflow is blowing out towards you and/or turn off your defroster. (If you have a knob to select airflow, turn it so it is no longer on "defrost" and it points to the main airflow blowing outward).

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NO HEAT ON FLOOR VENTS

---------

As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html


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No heat on Oldsmobile Silhouette?


http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

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http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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Hot air on the driver's side vents only?

http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

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Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

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1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold?

http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

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No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html

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http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

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http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

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http://whoisbyme.blogspot.in/2012/06/2009-mercury-grand-marquis-ac-blows.html

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http://schematicsdiagram.blogspot.in/2012/04/ac-not-blowing-through-vents-on-2007.html

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Passenger side temperature is warm air out of dash vents?

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These will help.

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Nov 28, 2012 | Cars & Trucks

1 Answer

No heat from vents


As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html

------------

No heat on Oldsmobile Silhouette?


http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

------------

Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

-----------

Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

----------

Hot air on the driver's side vents only?

http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

--------------

Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

-----------

1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold?

http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

--------------


No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html
----------

Ford F150 Ac only blows through defrost vents?

http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

----------

Dodge A/C come out of defrost vents only?

http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

---------

Ac vacuum line on dodge cummins?

http://technoanswers.blogspot.com/2012/01/ac-vacuum-line-on-dodge-cummins.html

---------

Ford ranger AC blows cold through defrost vents instead on cabin vents?

http://technoanswers.blogspot.com/2012/01/ford-ranger-ac-blows-cold-through.html

----------

2005 Chrysler PT Cruiser: A/C Blows Warm?

http://whoisbyme.blogspot.in/2012/06/2005-chrysler-p8t-cruiser-ac-blows-warm.html


-------------

2009 Mercury Grand Marquis: A/C blows Cold From Defrost Vent Only?

http://whoisbyme.blogspot.in/2012/06/2009-mercury-grand-marquis-ac-blows.html

-----------

AC not blowing through Vents on 2007 Chevy Trailblazer?

http://schematicsdiagram.blogspot.in/2012/04/ac-not-blowing-through-vents-on-2007.html

----------

Passenger side temperature is warm air out of dash vents?

http://schematicsdiagram.blogspot.in/2012/04/passenger-side-temperature-is-warm-air.html

----------


These will help.

Thanks.

Nov 28, 2012 | 2006 Ford Taurus

1 Answer

When AC is on it blows out the vents until I put my foot on the gas. While Im pressing the gas it comes out the defrost vents then take foot off and it comes out regular vents! Any ideas??


When the gas petal is pushed down the engine needs a amount of vacum to run.If there is not enough vacum it will pull vacum off heater/ac box inside which controls where the ai flow is controled.Check intake for vaccum leaks,hoses,connections.look for vaccum lost.

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1 Answer

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Had the problem been solved after you replaced the damper door switch and had the gas checked in the ac system??

_________________
ak90 programmer

Jun 27, 2012 | 2003 Ford Taurus

1 Answer

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