I have a 2002 Ex with the 7.3. Every time I put it into 4x4, the A/C automatically switches to the windshield defrost vents. After a couple minutes it switches back the the A/C vents. I'm assuming that isn't normal.
View 12 RepliesWhen the blower is on, it automatically switches from vents to defrost vents on its on. Does it about every 4 minutes.... like it's haunted. Curious if this is something i can tackle or do i need to take it in...
View 7 Replies2006 f350 DRW King Ranch diesel with 94,000 miles on it. When I shift in to 4x4 the AC switches to defrost and then takes 2 min to return to the vents. I imagine this is a vacuum leak issue. Where to start hunting? I pulled the dash for another install and all lines were connected. I will say the vacuum pump stays on longer than normal when the ignition is first activated.
View 1 RepliesCar do this? Seems odd to me. Iss there a way to disable via VCDS?
View 22 RepliesNo matter what I do with the settings for my heater in my lariat air only blows out of the dash vents. Defrost and floor vents don't work it still blows hot air out of the dash vents. I'm not sure what the deal is maybe the vacuum system? I did a search and all I could find was people having trouble with air ONLY blowing out of the defroster and my case is just the opposite.
View 8 RepliesMy 02 V-10 Ex seems to be blowing Air from the front vents up to the Defrost unless it go through a series of events-- Hit Auto then forward Air then the fan has to be a 4 only. It will blow forward vents then go back and forth from theirr to the defrost. Also the Temp seems to be much hotter then it should.
Took a interstate trip this weekend though and it seems to blow much colder and do a little bit better staying in the front vents however still goes back and forth. Im in FL and its HOT!!!! The only thing I know is that its a vacuum system.. and that again its HOT in the truck as a daily driver.
I have a vacuum leak. That's clear. When I put the truck in 4WD the air vents to the defrost after a slow (15-20 s) transition. The only way I can get the air to come back to the dash vents is to disengage 4x4. Of course, the auto-lockers aren't working. I can trouble shoot the vacuum lines and find the leak. No big deal.
I've isolated it downstream of the vacuum reservoir. It could be the PVH solenoid but at least the reservoir side holds pressure.
My concern is the noticeably poor A/C performance. It cycles between kinda cool and kinda warm. I remember the A/C being ice cold a few weeks ago.
Could the vacuum leak in 4x4 vacuum lines be related to the A/C problems? I'm thinking blend door vacuum issues. But I can't even find the blend door vacuum lines.
How do I know if my blend door is fully open/closed? Are there any other place to look that can cut down on my troubleshooting?
So in the past week only on certain days I have lost my ability to change zones for where my nice refreshing cold air blows on me from. It only blows out of the defrost vents. I here a fluttering noise under the dash when this happens. Also under the hood where all the AC hoses and such are located I feel cold air coming from inside the black box just next to what looks like the blower fan assembly. I don't believe I should be feeling that.
View 5 RepliesAir is only blowing through the defrost vents. No matter what I do - try to turn vents, A/C, heat, fresh air, recirculating, etc. Assume it's a switch or fuse issue somewhere. How to fix it?
View 11 RepliesI recently found out that my check valve needs replacing for my a/c vacuum. The problem came from when I turn my AC on, the panel vents do not work. Instead, the Defrost vents push the AC air out. How to replace the vacuum check valve? I would like to avoid the high cost of dealership prices.
View 14 RepliesWhen I have my a/c on, every time I step on the throttle it changes where the air comes out of the vents . Under normal power the air blows out the front vents, step on the throttle and it switches to defrost , let back off and it goes back to normal.?????
View 6 RepliesMy 2005 F250 just had the cab off in December for head studs and gaskets. Its a Crew Cab short bed FX4 so it has ESOF. When I engage 4x4 the blower will switch from blowing air out of the vents to blowing air out of the windshield defrost. Is a vacuum line plugged in wrong somewhere, or is one cracked? Trying to figure this out, its rather annoying
View 2 RepliesI used to drive a Merc and a Porsche and their front sensors switch on automatically when the vehicle speed is below a certain threshold say 10kmh. Can I somehow also make the front switches on automatically when the car is slow? Right now, the front sensors only switch on when in reverse or when the button next to the tranny is pressed. They switch off automatically when a certain forward speed is reached.
View 2 RepliesI have a new 2013 Prius C2 I bought a couple of weeks ago.
I listen to a lot of am talk and it works fine. Problem is when I start my car it automatically switches over to FM.
Even though my climate control system is not in auto mode, it still has a mind of its own. When I run my a/c, the airflow intensity level changes, and the system switches to defrost about every 5 minutes or so (even when there is absolutely no need for defrost). I continually have to set the system back to my comfort level. What causes this, and how do I fix it?
View 13 RepliesLooking to get the A/C working on my '78 F150 with integral (factory) A/C system. It is complete, but it seems to be blowing warm air as opposed to cold.
When I turn on the A/C, the compressor engages and the blower switches to the dashboard vents. I waited for a minute or two, but no cool air.
The sight glass has a silver line running through it. I assumed this was full? It would be black if it was low/empty.
I have a 2001 E150 and when i turn the AC/heat/air on it will only come out the defrost vents. Whenever i flip the switch left or right nothing comes out, but when i put it on defrost it works... but only through the defrost vents....
View 5 RepliesI have a 2002 SuperCrew - I've recharged the coolant - I can fill the air coming from the top defrost vents.
No matter what button I press on the air controls and can't get the air to switch to the vents. What the problem could be?
My 1999 F 250 5.4 liter. I know I have a vacuum leak because whenever I accelerate the air conditioning coming from the vents switches to the defroster. So my question is how do I go about finding the leak? My hubs in the front are manual so I know I don't have lines going up there. I do have some mechanical capabilities I've changed water pumps alternators brakes etc. But never anything with vacuum lines or a/c.
View 14 RepliesOn my new to me 02 Mountaineer, the a/c and heater air on my climate control system is acting up. Everything is working as it should, except that when you direct air to the floor, the air comes out the defrost vents. I took the glove box out and when looking from the passenger floor towards the center, I can see 2 actuators that seem to be working. I was wondering if there were more than 2 of them, maybe one on the drivers side that I am not seeing, Didn't know that if maybe when one closed that another one would open elsewhere. As I said everything else is working as it should. Also the recirculation door is working as it should. Something else that I noticed is that the top port(#6) on the row of the vacuum hose plug does not have a line on it. Where I can get a diagram or picture of the hvac system.
View 5 Replies1994 f150. When i use the max a/c setting, sometimes after a few minutes I hear a little thud and then all the air starts coming out of the defrost vents. This doesn't happen when using the regular a/c setting.
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