I was wondering if i should post but i can't seem to figure this one out. my a/c works intermittently when it works it works good then other times it is just blowing cool air but not cold. I recall a recent trip cruising about 80mph down the highway and we were sweating with it on full blast. but as soon as i pulled off the highway and the rpm's dropped below 2k it started freezing us out. it is very irratic (and i noticed my factory fogs recently also don't work) is this a harness problem or do you think the temp module is bad? i don't really care for this digital unit it seems like too much technology for a simple thing. thanks

 

it may be low in refrigerant or you could have a clutch issue whether it is air gap or a bad field coil. if you can get it to do it, look and see if the clutch is coming on or check cycle times. its probably still warm in florida huh?

 

and humid!

but i will check into that. has there been any of the "modules" that go bad or for lack of better term "the climate control unit". I guess 100 dollars to have them diagnose it would be worth it. there is only 1 week a year i think we don't need a/c LOL
thanks

 

you must have esp warranty. the more humid the harder the system has to work due to moisture in the air. the only problems i have seen with eatc heads on these is the fact they just quit working and wont power back on.

 

Mine was doing the same thing. It was the vacuum pump. when you turn the a/c on does the air first come out the defroster vents for about 10 seconds?

 

i'll have to check and see, The day it was acticng up i think there was alot coming from the windsheld , but I do know that it takes a 1min or 2 for the a/c to actually start blowing once i turn it on.

 

My 04 did that when it was new about 2 weeks after having it, I live in NW Florida bought the truck in july 04, took it to the dealer and they said they'd look at it and did all they could come up with is "it's a diesel and make more heat than a gass engine and it's doing all it can". Haven't noticed the problem in a long time though.

 

I like the low refrigerant idea. You'd notice a low refrigerant situation more when the engine's turning faster, because the compressor can pull down more on the low side faster when it's turning faster.

The thing where it dumps to defrost is another thing that happens on these, too. Ford has a TSB on that, which you can find along the top bar here. I don't think that would be intermittant, though.

If it's low refrigerant, that'll be picked up easily by anyone with an A/C manifold set. It'll draw down the low side too far and trip your low pressure safety switch, which will cut the compressor out. The cycling is it riding the limit of that switch.

 

do you have eatc or manual ac? if the air ever comes from the defrost vents when you have it in any other mode it is a vacuum leak. raptor, look under the right foot well under the dash and try to find a white vacuum line. this goes to the recirc door. i have seen this line knocked off many times. make sure this line is hooked up.

 

will check it out .thanks alot for you responses

 

i have the eatc. im assuming that is the electronic box under the radio that controls the temps. and i have traced the vacuum tube to the vent and it was all the way on