Ac problem
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New User
Joined: May 2014
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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!
Elder User
Joined: Aug 2004
Posts: 585
Likes: 2
From: Willis, Texas
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.
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.
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
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.
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.
Fleet Mechanic
Joined: Aug 2002
Posts: 1,899
Likes: 29
From: Raleigh USA
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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