Question about 2003 Ford Explorer Sport Trac

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Vacuum tube cracked

What would cause my vacuum tube to crack?

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  • deserth7 Aug 30, 2008

    i meant to say vacuum hose...



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Just age and the hot cold over and over in engine compartment

Posted on Sep 18, 2008


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Heater on hot air regardless of settings

Without knowing the make and model of your car, this is a general answer. Check for a vacuum hose that has fallen off the engine. Sometimes, the small diameter plastic hoses develop cracks that are hard to see. If you find one that has melted from excessive heat you can repair them easily by taking a very sharp knife to score the diameter then bend the end to snap off the damaged part. Cutting it with wire cutters will only crush it and cause more cracks. Once you have prepared the ends of the tube use a rubber vacuum hose section to join the plastic tubes together.

Jul 23, 2016 | Cars & Trucks

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My air conditioner will only blow out of the defroster and not my front vents on 2002 ford taurus any suggestions

Sounds like you have a vacuum leak to the control head. When you lose vacuum the airflow defaults to defrost. Check the vacuum hoses coming into the car on the passenger side under the dash. Supply vacuum is the black tube. There are five colors. Blue, red, yellow, white, and black.

May 06, 2014 | 2002 Ford Taurus

1 Answer

Vacuum line leak

If one vacuum line is cracked, it is time to replace ALL of the vacuum lines. They run the power brakes, control all of the air conditioning and heater controls and on some cars they are part of the emission control system.

Jan 20, 2014 | 2006 Cadillac STS

1 Answer

03 buick century, ac control knob blows out on all vents regardless where I position it. David

This usually is related to the vacuum reservior tank/cannister or the hose leading to that chamber. Any other vacuum hose leak could cause a similar problem depending upon it's location.

The hose leading to the cannister is usually just a thin single hose/tube leading to the cannister. The system allows vacuum to build up in the vehicle and maintains vacuum on the A/C system under heavy acceleration where a loss of vacuum would cause the A/C to change operation (switching from defrost to other venting and vice-versa) due to the loss.

You could have a cracked vacuum hose, or a cracked cannister.

You can use regular carburetor cleaner in a spray can with a nozzle, and carefully spray the vacuum lines on your vehicle when idling, and should notice a change in RPMs if you spray near a leak. Only spray a small amount at a time and let the engine compartment air out between spraying/testing since this is a flammable product.

This should lead you to identify any leaks.

Good luck!

Mar 28, 2012 | Buick Century Cars & Trucks

1 Answer

1994 ford mustang 3.8 v6 blower only blows thru defrost

Defrost is a default position for when there is a loss of vacuum. The vacuum controls the blend air doors. Start at the intake manifold and follow the vacuum hoses. There should be one that goes to a resivour (I think its behind a fender). It should T off and go inside the car. If the resivour is cracked or any of the lines are leaking that will cause the blower to only go through defrost.

I have also seen where ford uses plastic tubes and the dry battery acid had fallen on the tubes and ate holes in them. If any of the plastic tubes are broken, then each broken end can be inserted into a small enough rubber vacuum hose to repair them.

Aug 23, 2011 | 1996 Ford Mustang

1 Answer

When using the heater or air conditioner, all warm or cold air comes out off the windshield deforest vents, no matter what position the position control knob is on.

The air controls in the heat/AC system are vacuum operated. When the controls don't cause the air flow to shift it is normally caused by lack of vacuum to the air flow system. This is normally caused by a break in a vacuum or a vacuum line that has come loose from a connection, usually under the hood. These vacuum lines are small black plastic tubes about 1/8 to 3/16 in diameter. My experience has been that places under the hood where these lines are exposed to high heat causes them to get brittle and break or crack. I have found lines that are between the battery and fire wall that don't get much air flow and are heated by the battery are a likely place to look. Look for the line that goes through the fire wall. that is likely the damaged line. Trace it back to find the crack or break. If you find this is the cause, replace all the section of line that is brittle. If you don't do that you will have the same problem again very soon. You can splice sections of this tubing with rubber hose of the proper inside diameter. Good luck.

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Jun 22, 2011 | 1997 Jeep Grand Cherokee

2 Answers

My car die at stop lights. Can the cause be due to a cracked PCV tube.

if you mean the pipe at the froint of the engine under the inlet manifold then no, because when this one splits and sucks in air it races ,that is if its a europeon focus and not an american californian model

Nov 10, 2009 | 2003 Ford Focus

2 Answers

There is a whistling ticking noise coming from my engine while running. What are some things that could possibly cause this.

Whistling can be caused by vacuum leaks. look for hoses and tubes to be cracked or broken. The tick may be the sound of the injectors working or valve noise. more info needed.

Oct 17, 2009 | 1997 Pontiac Sunfire

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