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2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 or 4.2 V6 engine
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Old 05-26-2014, 09:17 PM
Ford12006 Ford12006 is offline
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Ac problem

I had all components on a/c replaced. Problem is I can't find out why it's not draining water off the evaporator. I have looked under the truck to find the drain tube but there is not one. Is something wrong here? After driving the truck for 30 to 45 mins the air starts to get hot and it starts to lose fast air flow from vents. If I shut the a/c off for an hour the a/c will work and then it starts the same thing over again. Please give me a fix!
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Old 05-27-2014, 04:21 AM
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there is a drain tube. I believe that it is just a simple hole with nipple that sticks out of the firewall.

As for your issue...sounds almost like its freezing up the evaporator core...and since it isn't draining then you should see some moisture dripping from the passenger side HVAC case under/near the glove-box.

as for the reason for freezing up...could be a wrong charge of freon, drain plug, or pressure/cycling switch issue.

hope this helps to get you in the right direction. I am sure others on here can chime in and give some more ideas.
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Old 05-27-2014, 08:31 AM
projectSHO89 projectSHO89 is offline
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You probably need to look harder for the drain. It might be behind a shield to protect it from the exhaust. Find the two lines for the refrigerant that does to and from the evaporator. Look straight down, the drain will be at or near the base of the firewall within less than a foot left or right from a vertical line below the refrigerant lines. It might have an elbow and a hose on it.

Now, are you certain it isn't draining? If it isn't, you should have a wet floor on the passenger side as already mentioned.

If it's just freezing up, it may be due to a clogged drain or a stuck cycling switch or some other part.
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Old 05-27-2014, 08:31 AM
Ford12006 Ford12006 is offline
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Thanks ism still trying to locate tube. And I am not having any water dripping in the cab yet!
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Old 05-27-2014, 10:18 AM
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The drain is hidden behind the firewall insulation right behind the trans dipstick tube and right O2 sensor. Real PITA to get to. You will see a bulge in the insulation where the drain is.
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Old 05-27-2014, 10:18 AM
 
 
 
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