Air Conditioning Issue Help!

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Mar 19, 2007 | 01:22 PM

WME

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Joined: Jul 2004

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From: Mesa, AZ

Air Conditioning Issue Help!

Hello,

I live in Arizona and with temperatures already in the 90's I am trying to determine what is causing as AC Issue that just showed up our of the blue. I drive a 1997 5.4L Expedition 4X4 Eddie Bauer edition with 125,000 miles still going strong. MY AC works very well when idling or when traveling at a constent speed. When ever I excelerate however the air flow is diverted to the defrost vents by the wind shield and it blows hot air until I get to a constant speed again. Then the airflow diverts back to the front panel and is as cold as when it changed direction.

Any further needed information can & will be posted and any assistance is grealty apprecieated.

Mike Erwin william.erwin@century21.com

Mar 19, 2007 | 01:29 PM

WME

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Joined: Jul 2004

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From: Mesa, AZ

Air Conditioning Help Needed

Hello,

I drive a 1997 5.4L Ford Expedition 4X4 Eddie Bauer edition SUV with 125,000 miles. My SUV runs great and then reciently the AC started to have issues. My AC cranks out cold air when I am ideling and running at a constant speed; however when ever I accelerate the airflow is diverted from the from front panel to the defrost vents located by the windshild and the air is hot. When I reach a constant speed the airflow is diverted back to the panel and is always very cold,

I suspect a temperature controler but any educated insite would be greatly appreciated. It a good truck with many more mile to go.

Last edited by WME; Mar 19, 2007 at 01:32 PM.

Mar 19, 2007 | 02:05 PM

01silvergt

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From: Richmond, TX

You have a vacuum leak. Look for a leak in the hoses around the intake.

Mar 19, 2007 | 02:23 PM

WME

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From: Mesa, AZ

Air Conditioning Issue Help Needed

Thank you for the reply I will look at the vaccume lines and let you know what I find.

Mar 20, 2007 | 06:42 AM

projectSHO89

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From: St Louis

Look first at the lines located between the battery and the firewall. The little black one is the most common.

Steve

Mar 20, 2007 | 06:46 AM

projectSHO89

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From: St Louis

You hit a double!

Both a broken blend door AND a vacuum leak from the intake.

Steve

Mar 20, 2007 | 07:07 AM

mallen88

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There is a vacuum check valve on the passenger side up by the firewall. It is blue on one end a white on the other. That check valve goes bad and causes the complaint you are having with the air going to defrost vents on accel.