Question about 1994 Jeep Grand Cherokee

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Air conditioner blows out vents and defrost vents at same time but when I put control on defrost nothing happens.

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Sound like cotrol not swapping them over

Posted on Jul 19, 2009

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Cold& warm/air would not blow out in any vents. Put in new direction switch, air blow in all vents except the defrost vent. Swtich on defrost and it blows in dash vents in your face and nothing coming out...


The switch that controls the air flow is either operated /controlled using either wire, pneumatics, or electrically driven/controlled. Make sure that all of the connections at the damper are intact and working properly. Pneumatically driven is usually the most common on todays vehicles, so make sure you don't have a vacuum leak on any of the damper hoses.
I hope that you have found this information to be useful, and if I can be of any further assistance, please let me know. Thank you for using fixya!

Aug 01, 2013 | 1993 Chevrolet Corsica

1 Answer

I have a 1995 Corvette and when I turn the air conditioner on the dashboard vents does not blow cool air


the a/c control is electric for temp control and vacuum for mode control when a leak occurs it defaults to defrost floor .look for a leak or broken vacuum line first then control panel then mode actuator.

Jul 30, 2012 | 1996 Chevrolet Corvette

1 Answer

Air conditioner blows out defrost vents when acceleration.


In f150 truck there is a small vacum hose passenger side up by the windshield. It's a small hose check really good they dry rot and it will cause your vents to switch. Also if your box is bad. It's next to the battery

May 02, 2012 | Ford F-150 Cars & Trucks

1 Answer

My 03 Ford ranger's air conditioner blow cold air but it will only blow on defrost, it wont blow out of the vents


your controls for floor,vent.defrost ect. is in default mode due to a loss of vacuum.
you need to inspect vacuum lines for being lose cracked,or disconnected.hose will run from engine
intake manifold through firewall into the dash.i'd start at intake manifold looking for bad hose

Jun 29, 2011 | Ford Ranger Cars & Trucks

1 Answer

2002 explorer a/c blowing out of defrost and not dash vents


The direction of the air flow (dash/defrost/floor, etc) is controlled by vacuum going to the switch. There may be a vac line that didn't get connected or was damaged when they put the replacement engine in it. Check the lines on the firewall to make sure nothing is loose.

May 26, 2010 | 2004 Ford Expedition

1 Answer

My Defrost doesn't work


Check to see if the duct hose to the defroster vents has come loose. If air is blowing out under the dash when you have the control set to defrost, then this is likely.

Dec 13, 2009 | 2003 Chevrolet Silverado 1500

1 Answer

A/C blows from defrost and floor vents, nothing from dash vents.


the switch where you turn it to blowing at your head is probably out. you will need to replace the switch control where your defrost, foot, head etc. what make, model, year is your vehicle?

Jul 09, 2009 | 1994 Toyota Camry

1 Answer

Air comes out of the defroster and floor vents but not the air co


under the hood on the firewall there is a square boxlike cover beside the maxifuse&relay. there is a vacucum hose there that controls the vent shutoff had same problem with my 93 bonneville sse when purchased, check to see it has no cracks or has pulled out of rubber connecter .

Mar 24, 2009 | 1997 Pontiac Bonneville

1 Answer

Heat wont blow through heater or defroster vents


common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Jan 18, 2009 | 1997 Chevrolet K1500

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