This truck has been like this since I bought it but this is the first time I have had to drive it when its really hot out...I was burning alive in it today, 100 degrees eeeek!

Anyway...the AC has just been converted to r134 a few weeks ago and is charged up and blows ICE cold. Problem is, it seems to blow about 90% to the floor and 10% out of the top vents, you can feel air coming out just when you are driving and its really hot outside, it freezes your feet but the rest of your body your still sweating. I tried taping off the vents at the bottom to see if it would direct some air up top and it made no difference.

Please somebody tell me any ideas on how to fix this!?! Going nuts!

EDIT: Forgot to mention that most of the people I saw on here with the same problem say that it blows from the defrost and the floor and not the dashboard vents. That is not the case for me, the defrost doesnt blow anything and the dash blows a little and the floor a LOT. The fan kicks on LOUD and sounds as if its blowing a lot of air (well it is, out of the bottom) so I dont think the fan is the issue. Also, when changing the selector switch you can hear the vacuum and it sounds normal.

 

Sounds like you have a mode door problem... Just because it sounds like it's doing something doesn't mean that it is. And it definitely isn't if when you switch modes on the mode selector switch it doesn't do anything. Its possible that just one door is hung up and diverting all of the airflow to the floor. You can lower your glove box and take a peak behind it. See if you can make out anything that just isn't right. Try to manually actuate all of the vacuum valves to see if you can find one that is sticking.

I don't have access to any good information on your year, but hopefully someone else does.

 

The truck is a 94, the glove box is not removable it's attached to the whole dash. It does have the black access panel along the bottomside of the dash on the passenger side. You say selector switch, the truck has defrost, vent, heater, norm ac and max ac, that's it, no selector for the vents. When you put it on defrost it blows out of the defrost like normal, vent is outside air through the dash vents like normal (with no ac of course), and norm and max ac are identical, tons of air out the bottom and nothing from the top. Where would i need to look for something sticking that I could actually get to? Where are the vacuum valves located, I have pulled the panel off and cannot see anything. I have had the dashboard off in this truck to replace the heater core already but would prefer not to have to go through all that again.

EDIT: Ok so I went out there and inspected a few points after reading some other posts on here..first off, the "ball" as they call it that hangs off the hood (doesn't hang off the hood in a 94, but I had a 97 I knew what they meant), doesn't have a vacuum leak. Considering I just went over all the vacuum lines under the hood and replaced everything and checked for leaks when I replaced my fuel spider and nut kit 3 days ago, I am pretty sure this is not a underhood issue, and I had the vent issue when I bought the truck.


I also inspected behind the valve cover where they come off the intake manifold and split off.



[hr]

This is the view under the dash (through the mess of XM, Sirius and AVIC-N3 wires), as you can see there is a bunch of black ducting under there but it appears that you have to remove the dashboard to take them apart fully, is there where the doors are located?

Either way I havn't looked for a vacuum leak behind the HVAC controls either, should i inspect back there? Somebody give me an idea where to look so I dont have to tear the whole truck apart.

thx

 

I am not sure if you have fixed your problem yet but you might want to try the vacuum selector switch that atteches the vacuum hoses to the rear of the heater switch.