Ford ltl 9000 A/C dead

[FexplorerV8]

I’m trying to replace/rebuild the A/C system on my Dump Truck I’m desperate for help as it is extremely expensive to get the truck even looked at, I’m pretty good mechanically and have just about every tool u can think off, when I bought the truck 2 years ago the A/C didn’t blow cold and it hasn’t to this day, I had a mechanic look at it about a year and a half ago and he said that I need to get the compressor rebuilt witch I did we mounted the compressor and added Freon but never got cold air, the mechanic then said to get the filter / air dryer I never got around buying it until today as I had to put money on other repairs that could not wait, I’m going to pick up the filter today and one of my friends its letting me borrow his a/c vacuum but to be honest I don’t really know what am doing.
All I can say is that I’m getting sick because off all the dust I breathe I have to keep both windows opened just to get some air circulating in the truck's cab and the pit where the truck gets loaded has dirt roads, so u guys can imagine how bad dust flies when another truck its driving in front of me....
Any help its welcome.

 

[Brock94]

Your post was a couple days ago, but I'll respond since I see no one else has yet. Obviously there could be any number of problems with your system and simply replacing one component at a time isn't the way to go. If it's true that your compressor failed, it's possible that that was caused by other things-- like a leak in the system combined with a failed low-pressure cut-off switch. If you want to fix this yourself, you really have to learn more about AC systems generally and about your system specifically (is it R12 or R134a for example). Since your compressor failed, you should have flushed out/replaced other system components to prevent debris in the system from damaging your new compressor. The debris from the old compressor (eg small shards of metal) may have clogged up the orifice tube on your system as well-- preventing it from functioning now.

I would say you have to disassemble your system, flush it out, replace the orifice tube and the filter-drier, replace all the o-rings, reassemble, add the proper oil amounts and the proper charge, vacuum the system, recharge and test for leaks.

I don't want to scare you-- you can do all this yourself with a little knowledge and some basic tools, but you should learn to do it right to be successful or you'll just waste your time and money.

There's a good automotive AC specialty forum (run by a web-retailer, but they still give good info) at www.acsource.net/acforum

Here's a link to a write-up of the show "Weekend Mechanic"-- they did a retrofit of an older R-12 system, upgrading it to an R-134a system, but for you the interesting part is that the older system had a failed compressor, so they discuss all the stuff that should be done in that case: http://http://www.diynetwork.com/diy/shows_wkm/episode/0,2046,DIY_14348_26868,00.html

Also search for write-ups on this site by Glacier he knows his A/C stuff.

Good luck!

 

[BrooklynBay]

Did you check to see if your compressor's clutch turned on when you turned on your A/C? One way to tell if you have a leak in your system is when you connect your vacuum pump. Watch the gauge to see if it is able to hold vacuum. If it can't maintain a constant level, then you would have to check for leaks on the O rings, hoses, condenser, etc.