Ive notcied for a while now that when i first crank my truck up and turn the ac on it wont cool till I start moving. Also it seems after i move and say come to a red light. The fan will roar for about 10 seconds then go away. Some people have told me I have a fan clutch problem is this the case becuase I have no idea?

 

I would think since yours cycles off and on it should be okay. I can only relate to you the issue I have with my 04 4.6 SCrew. The A/C in mine has never been great and I live in near desert like country. It's fairly common for us to have 125F days and sometimes weeks at a time. I've seen the thermometer still locked up on 125F after the 10 PM news goes off. I've had the pressures checked, all were okay which also indicates the fan clutch working right. No one could solve the issue so I've lived with **** poor A/C. I got a wild hair after surfing thru some of the posts here about the air blend door not shutting completely. I went to Lowes and picked up a 1/2" ball valve and 2each 1 1/2" nipples. I put them together and took the heater hose from the intake area and put the valve in place without cutting the original hose. My A/C dash temps fell at idle by 14F. I can now get 40F air out of the vents on almost any fan speed at idle. The valve, nipples, clamps, and about a 2" piece of hose cost me less than $15.00 to fix my A/C. Can't say if that's your problem or not but plugging the heater hose is an option to see if it helps.
FWIW, I did a poll here a year or so ago about fan clutch life. Seems most have never replaced it even with units in excess of 200,000 miles.

 

Hmm seems interesting. I forgot to add all pressures were good the low side was real good. Tell me more about what you did to make yours colder please.

 

Here's a pic of what it looks like now. I expect to find a better, more professional way to do it but this works for now. Considering I wasn't sure how this was going to turn out and I didn't want to cut the original heater hose, it ain't bad. Now I can actually say my truck has A/C. But it hasn't been all bad. When we car pool for lunches, they won't ask me to drive-LOL.

 

how does that work though? Im down if it would make my a/c colder becuase it sucks always had.

 

The blue handle on the valve is in the off position. It turns one quarter turn to turn it back on. Turn the heater hose off and there's no hot water in the heater core for the blend door to push heat into the A/C. Dropped the vent temps 14F on mine.

 

If you a/c works fine one you start moving you may have a bad fan clutch or you might also have a dirty condenser. Over time a lot of crap can plug up the fins in the condenser and do a number on it's effectiveness. Get out the hose and clean it up best you can. If you notice your engine temperature creeping up at a traffic light that's also a symptom of a fan clutch that's not doing its job.

 

I'm a pipefitter by trade,almost 27 years.On mine I used a 1/2" stainless ball valve with barb connections to tie into the hose.If you do this mod make sure you install it on the supply side to the core.BTW,my a/c temps dropped almost 13 degrees after this install.

 

I cleaned my condenser. And it doesnt run hot at light. I gotta do this mod

 

I'm real good at listening to those that have a clue. Many, many thanks for the info. I'll be by a plumbing supply Friday before I go home. Thanks again!

 

I have an old chevy k10 that I added a ball valve to a few years ago, only because changing the heater core is piece of cake (I bet the cab temp dropped 20 F afterward). I've been a little gun shy on doing it on 150, since the whole dash has to come out to replace the heater core and I wanted to make sure that I did not chance getting any corrosion inside. I'm no Ford engineer but I'm willing to bet that's the reason for not having a vaccum actuated shutoff valve from the factory.
Autozone keeps in stock a heavy duty fan clutch (Ford does not make one) for these trucks. I just bought two 05 f150's a few months ago that may get them installed to see if they help with ac temps. On my personal truck we adjusted the low side pressure parked and revved to 2000 rpm (low side pressure drops big time just off idle on my truck), big difference in my ac temps and I finally have to cut it down after 20 minutes of driving.