Question about 2000 Ford Expedition

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AC my AC blow out the defrost for about five minutes then it will come out the vents. Accelerate, it will go to defrost until you relax the accelerator. after about 10 minutes, it will work normal

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  • Ford Master
  • 12,223 Answers

Go to www. aa1car.com and get the topics and fix it.

God bless you

Posted on Jul 18, 2013

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6ya6ya
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Posted on Jan 02, 2017

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michigan man
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SOURCE: Auto climate controll only blows through defrost & floor,not the

it either has a vacuum line on the back of the unit off or the control unit is bad

Posted on Mar 21, 2009

tepfy
  • 319 Answers

SOURCE: air conditioning blows out defrost when accelerator is depressed

You need to open the vent, under the dash. Check the cable and moving action assembly. Make sure that it is all moving correctly. Some of the newer hvac systems in cars work off of vacume but most work with cables. Not big long cables, just small lever cables. also check your seals and make sure none of them are broken. I often find this is a bigger probel, the seal is cracked or broken or just came off and needs to be re glued in place. Don't be afraid to take the vent tubes apart as long as you can remember where they go.

Posted on May 31, 2009

harley9701ha
  • 424 Answers

SOURCE: ac on 2003 f150 supercrew blows air out defroster when on max

Check for vacuum leak going to air inlet door. Should be a white vacuum hose.

Posted on Jun 22, 2009

  • 179 Answers

SOURCE: air conditioning blowing out of defrost

your vent is not closing usually controlled by vacuum is there a vac hose off under the dash?

Posted on Sep 21, 2009

  • 135 Answers

SOURCE: AC blows out of the

SOUNDS LIKE A VACUUM PROBLEM ...CHECK THEVACUUM RESERVOIRS FOR LEAKS ,,CRACKS ETC ,, USE A HAND OPERATED VACUUM PUMP AND PLUG THE OTHER PORTSTO SEE IF IT HOLDS VACUUM. ALSO CHECK THE PLASTIC VACUUM LINE THAT SUPPLIES THE A/C CONTROLL SWITCH . THERE SHOULD BE A CLEAR 2 HOSE CONNECTOR BELOW THE GLOVE COMPARTMENT I THINK THERE ARE 2 HOSES THAT ARE USED ,BLACK , GRAY , USE A SMALL VACUUM T AND INSTALL IN THE VACUUM SUPPLY LINE ( I THINK IT'S THE BLACK LINE ) TEST DRIVE THE VEHICLE AND SEE IF THE VACUUM GUAGE ON THE PUMP FALLS DURING ACCELL IF IT DOES TURN OFF THE A/C AND RETEST IF IT FALLS . AGAIN CHECK ENGINE VACUUM AT INTAKE MANIFOLD SUPPLY PORT TO VACUUM CANISTER ,, I HAVE SEEN ANYTHING FROM CRACKED VACUUM LINES ,CHECK VALVES, TO CAT CONVERTORS CAUSE THIS

HOPE THIS GETS YOU IN THE RIGHT DIRECTION

Posted on Aug 16, 2010

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1 Answer

Why does my ac switch from vent to defrost while driving?


This is due to a vacuum issue. The vacuum created by the motor is used to operate the actuators that control the direction of the air flow. When you accelerate you are creating more vacuum which in turn creates more in the actuators causing them to pull harder so therefore the desired setting is changed. Check your Pcv valve and make sure your hoses aren't dry rotted or leaking elsewhere, which may impact overall vehicle performance. Hope this help explain what's going on

Jul 19, 2014 | 1997 Jeep Cherokee Country

1 Answer

Ac vacuum


There could be a vac tank problem or a vac leak.
Most american vehicles use a plastic ball or object as a vac holding tank. The tank or a vac hose can be leaking.
If the system fails, the default position is the defrosters for safety.

Jul 05, 2012 | Cars & Trucks

1 Answer

My 2003 Jeep Grand Cherokee has a blower problem. The vent/AC blows out of the floor and Defroster when I accelerate, when it is supposed to blow out the front. Please let me know what you think. I...


I think you are completely right. When you accelerate, you are opening the throttle up a little, or adding more fuel, either way, this causes a drop in pressure, which will cause the spring to pull the vent back into defroster mode. My friend has been dealing with this for years, and we still are not really sure what to do about it. What may be the cause, though, is if one of the vacuum hoses leak, it causes the lower pressure to lower still further, so check to make sure none leak.

May 23, 2011 | 2003 Jeep Grand Cherokee

1 Answer

AC blows out of the defrost vents until you accelerate for awhile and sometimes when you stop at a red light it will change from the ac vents and go back to the defrost vents


SOUNDS LIKE A VACUUM PROBLEM ...CHECK THEVACUUM RESERVOIRS FOR LEAKS ,,CRACKS ETC ,, USE A HAND OPERATED VACUUM PUMP AND PLUG THE OTHER PORTSTO SEE IF IT HOLDS VACUUM. ALSO CHECK THE PLASTIC VACUUM LINE THAT SUPPLIES THE A/C CONTROLL SWITCH . THERE SHOULD BE A CLEAR 2 HOSE CONNECTOR BELOW THE GLOVE COMPARTMENT I THINK THERE ARE 2 HOSES THAT ARE USED ,BLACK , GRAY , USE A SMALL VACUUM T AND INSTALL IN THE VACUUM SUPPLY LINE ( I THINK IT'S THE BLACK LINE ) TEST DRIVE THE VEHICLE AND SEE IF THE VACUUM GUAGE ON THE PUMP FALLS DURING ACCELL IF IT DOES TURN OFF THE A/C AND RETEST IF IT FALLS . AGAIN CHECK ENGINE VACUUM AT INTAKE MANIFOLD SUPPLY PORT TO VACUUM CANISTER ,, I HAVE SEEN ANYTHING FROM CRACKED VACUUM LINES ,CHECK VALVES, TO CAT CONVERTORS CAUSE THIS

HOPE THIS GETS YOU IN THE RIGHT DIRECTION

Aug 16, 2010 | 1995 Ford F350

2 Answers

Air conditioning blowing out of defrost


you have a vacum under the hood pluged into the wrong spot

May 31, 2009 | 1996 Ford Thunderbird LX

1 Answer

Air conditioning blows out defrost when accelerator is depressed


You need to open the vent, under the dash. Check the cable and moving action assembly. Make sure that it is all moving correctly. Some of the newer hvac systems in cars work off of vacume but most work with cables. Not big long cables, just small lever cables. also check your seals and make sure none of them are broken. I often find this is a bigger probel, the seal is cracked or broken or just came off and needs to be re glued in place. Don't be afraid to take the vent tubes apart as long as you can remember where they go.

May 31, 2009 | 1996 Ford Thunderbird LX

1 Answer

Auto climate controll only blows through defrost & floor,not the


it either has a vacuum line on the back of the unit off or the control unit is bad

Mar 19, 2009 | 2005 Ford Crown Victoria

3 Answers

2003 Honda Accord 4 cyl ex Air conditioner Problem


Even under acceleration you should have cold air from vents.Does the air change from the vents to defroster or elsewhere when accelerating? Make sure you have a full charge of refrigerent..Also make sure the engine isnt running hot...

Sep 19, 2008 | 2004 Honda Accord

1 Answer

A/c dies when accelerating


if you are losing it blowing out of vents then it is losing vacuum and going to defrost. this would be caused by a broken vacuum line to the vacuum resevoir

Aug 22, 2008 | 1988 Jeep Cherokee

1 Answer

AC is blowing but not coming out the vents


what do you have 280z or 280zx. auto climate control or manual ????
your problem seems to be in the vacuum control.
need to get a FSM and figure out what is leaking.

Aug 14, 2008 | 1983 Nissan 280ZX

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