ac not going through vents

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Mar 17, 2015 | 11:56 AM

coop101

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ac not going through vents

Today charged my ac system, as it is working properly. But all my cold air is going out the drain tube instead of my vents. it is 99 f150 4.2 liter have please help with ideas.

Last edited by coop101; Mar 17, 2015 at 11:59 AM. Reason: spelling

Mar 17, 2015 | 08:48 PM

steve(ill)

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what drain tube ? The TEMP control **** mixes hot and cool air to get the temp you want. The other selector **** allows you to open vent doors to the defrost, dash, or floor. Does that selector **** work ? Can you put air to the floor and dash or just defrost ?

Mar 18, 2015 | 06:21 PM

coop101

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The drain from the ac condenser that releases the condensation

Mar 18, 2015 | 08:45 PM

steve(ill)

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its not possible for all the cold air to go out that small drain.

Mar 18, 2015 | 09:28 PM

projectSHO89

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From: St Louis

Clean the evaporator core.

Mar 21, 2015 | 06:06 PM

coop101

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Quote:

Originally Posted by projectSHO89

Clean the evaporator core.

how will that help

Mar 21, 2015 | 08:13 PM

steve(ill)

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The blower should be running and pressurizing the air duct / box... If the air is not coming out the vents, then SHO89 is suggesting the evaporator core ( cooling fins) may be plugged up and stopping the air from flowing thru the duct. I will post generic drawing of the system.