Need help! Please! 2003 fx4 f150
Thread Starter
|
New User
Joined: Oct 2014
Posts: 3
Likes: 0
Need help! Please! 2003 fx4 f150
So, I know this question has been asked probably a million times. But I can't seem to find the exact information I need. I have a 2003 fx4 f-150 and just like everyone else. My 4x4 doesn't work. But, the deal with mine is that sometimes it works, sometimes it doesn't. It's a toss up. When it does go in however, it doesn't stay locked in. Sometimes it stays in for 10 seconds, sometimes 30 minutes. When the switch is turned to 4hi or 4low it doesn't always engage, only sometimes. Light on dash comes on every single time I matter what. Solenoids click as they should. Also, the a/c and heater was stuck in the vent only, recently went to defrost only. Thanks!
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
go to defrost means you are loosing vacuum........ 4 x 4 has two steps.. Electric motor at transfer case to engage front drive shaft.. vacuum cylinder at front pumpkin to engage driveshaft to axle half shafts... check vacuum at the hoses at differential cylinder. You may have NO vacuum, hoses cut, leaking, etc.. and effecting defrost also.
Cross-Country
Joined: Oct 2014
Posts: 96
Likes: 0
go to defrost means you are loosing vacuum........ 4 x 4 has two steps.. Electric motor at transfer case to engage front drive shaft.. vacuum cylinder at front pumpkin to engage driveshaft to axle half shafts... check vacuum at the hoses at differential cylinder. You may have NO vacuum, hoses cut, leaking, etc.. and effecting defrost also.
i fixed my heat and drove the truck for a year, then my 4wd was intermittent once, and then wouldnt work, i found in mine the fire melted a hose just enough for time to make it brittle, then one side broke. i went to parts store and ended up using windshield washer sprayer hose instead of finding the hard plastic.
Thread Starter
|
New User
Joined: Oct 2014
Posts: 3
Likes: 0
Vacuum Is good all the way down to the actuator, actuator moves as it should when the switch is turned. And mine doesn't go to defrost, it's stuck there. Whether it's on a/c or heat. It's always on defrost. It used to be stuck just on the front dash vents.
Cross-Country
Joined: Oct 2014
Posts: 96
Likes: 0
if your diff actuator is working then i would suspect the electronic actuator for the transfer case. one way to tell would be to lift one front side of the truck, engage 4wd, if the front axles are engaged when you spin the lifted tire the front driveshalft will spin. furthermore if you cant spin it (you shouldnt be able to) then your transfer case is properly engaged. the front ds may spin from the slight drag so you might need somone to apply more force to prove that the axles are locked.
if your heat is sticking to one or the other for no apparent reason i would suspect the dash control. possible a broken ****? start simple there. the way the system works is when you loose vacuum it will automatically default to defrost. so if it is sticking the vent then i would say its in the control.
if your heat is sticking to one or the other for no apparent reason i would suspect the dash control. possible a broken ****? start simple there. the way the system works is when you loose vacuum it will automatically default to defrost. so if it is sticking the vent then i would say its in the control.
New User
Joined: Mar 2014
Posts: 2
Likes: 0
I understand these are old post but I wanted to add this just for those that might come looking for tips in the future.
Those that has these type intermediate 4x4 concerns including heat not switching properly or going to defrost on it's own should check the vacuum tank behind the battery they are known to crack and come apart sometimes giving you just enough vacuum to appear ok but not enough to work or keep the diaphragm engaged.
Those that has these type intermediate 4x4 concerns including heat not switching properly or going to defrost on it's own should check the vacuum tank behind the battery they are known to crack and come apart sometimes giving you just enough vacuum to appear ok but not enough to work or keep the diaphragm engaged.
Thread
Thread Starter
Forum
Replies
Last Post
AllAboutTL
1997 - 2006 Expedition & Navigator
11
Jan 29, 2010 12:58 AM
