lampltr

Hi all,
Am new here as well to the awesome Cummins scene but an a happy customer so far with 289K miles.

Issue currently is with the A/C as I was hoping she may be down in freon.
While stopped, the compresser will begin to blow warm/hot air (Texas heat?). Driving, used to be very comfortable but lately the coolness has been slowly dying off. In addition, noticed the compresser going on/off every 4 sec or so when under the front end. Picked up a small can of 134a from Walmart along with a pressure guage. Followed directions however the pressure indicated was in the red which I knew should not be.

Arrived at friends who had a pressure system to properly service a system. The low side was putting out about 150/High Side was 450 to 475. He had never seen a system with this much pressure and recommended getting her checked out.

Any recommendations here? Possibly the condencer/internal filter system clogged up?

I purchased the truck last October, but not positive if the system has ever been an issue let alone service time.

Am also looking for a good source for a service manual, feel naked without one, thanks all

Spooler

Hmm, I would have it serviced. You may have put too much in it, You may have a restriction, your radiator is plugged up with junk, or your fan is not working properly. this will give you a good place to start.

Do the 3 key on/off trick and pull the codes if you have any. You can use DTR Wiki to check to see what they mean, if you have a code.

lampltr

Interesting Spooler, much appreciate the info. Did not have a chance to service it, only a very small boost can of additive. Was a little noticible difference today however I agree with you.
Believe there is a restriction somewhere as does a friend of mine, we were thinking in the restrictor. The later 2 you meantioned, I did not think of but will have checked out.

The 3 key on/off trick, did not have a clue about...will attempt this in the am. Much appreciate once again, will let you know as time progresses.

jhenson

Your low side should be somewhere around the 30-40 range....150 !!! High side should read around 275-300. The fast cycle sounds like low charge but apparently something else is wrong. I would say possibly a stopped up orifice tube but then It wouldn't cycle at all....found that out on my sons Chevy.

I'd definitely have it looked at....you've got some major pressure issues going on there.

gcssr

Bleed off pressure to 35/45 max, check output, the over service restricts flow, try this first before you blow the system apart. It a service problem, as we are in a extreme heat wave, with over 70 days of 100+ weather, ac will warm when low speed or idle;;;;;;;;;;; Also look into blend door, one up behind glove box, It could be breaking or broken, allowing hot air to blend, in place of cold air;;;;;;;;;;;

jhenson

The HVAC doors could be an issue, but with his pressure readings, somethings definitely wrong. If the fan speed is set to low you will notice cooler air from the vents....if set to high, you are moving more air across the evaporator than what is being cooled, thus causing a warming effect from the vents. I would seriously look into the orifice tube possibly being clogged. Other than that it almost seems like a case of overcharge. Ask me how I know, I blew the tail-end out of my compressor because of it.

If the system has been worked on or replaced ask what was done. If a compressor lets go then you should definitely replace the dryer with it.....it's super cheap and good insurance. Other than that it could only be the orifice tube.

I'm in Central Texas so I feel your pain about the lack of good a/c. Not to rub it in, but after my a/c woes, I now have that sucker freezing my nads off .

Boudreaux

^^^^^^^ Maybe try evacuate system,Vacuum, recharge with correct amount. Pressure still high, orifice tube or worse.

Major colon cleansing involved(the AC not you)

I'm not going to rub it in either,but after mucho misery, my wife got a pair of flannel panties for her Birthday

JHenson you and I are competing for the" how hot it is down here" trophy,
so far you are up by a horse length

Boudreaux

P.S. Spooler, I hope your not in harms way with this hurricane

lampltr

Appreciate the response guys....Will print this thread out in the am and make an appt. Definately need a service manual as feel naked without one (No strange thoughts Boudreaux haha).

Spooler, did get the codes earlier today but forgot them in the truck...only now remembered after seeing this thread (Dah).

Again many thanks guys.....Better keep it low key Boudreaux & Jhenson...have not seen my better half for 2+ years now...am getting more and more ****** with Immigration as many obstacles and $$. Time to go back overseas where she (we) never had any problems.

Yes you are rubbing it in Jhenson, but with my envy haha. Desiring to head to Phoenix to empty out my storage this upcoming weekend, would be good to have a decent working AC without any obstacles.

Stay safe if any of you are on the East Coast. Would be great to have a truck camper towing a trailer with personal effects. Chao all...will keep you posted, am curious about the error code though

Spooler

If you had codes, I beat you have a fan speed code and if so, this is your issue.

I'm good. No storm worries for me. I need the rain though...

lampltr

P0480 Fault Code: Fan 1 Control Circuit....

Spooler, you were very close. Will do some research here to get some more info as I am pretty green when it comes to this computer controlled dually.

Saturday will look for a local mechanic close to where I live that I was told was very good in this type of work as meantioned above. Feel it is a great idea to change the Evaporator, Orifice tube, and whatever else I find.

Super weekend to you all

lampltr

Forgot to add...that DTR Wiki is kickin' guys mama mia. I have a Porsche and analyzing the codes is not this easy...Bravo DTR!!

Appreciate the info!!!!

Spooler

No need to change anything. First get the fan fixed and enusre your radiator is clean and not full of junk. Get under the truck and look for the metal line that feeds the wires to the Electric fan clutch. Make sure they are not ripped out. If they are, you will need to replace the fan and check the bearing on the engine for play to ensure you don't eat the wires again.

The lines run on the bottom drivers side of the truck not far from the Crankshaft position sensor. They are right under the CP3.

lampltr

Quite the day today...Was working at the military base, had our local auto hobby shop change the transmission fluid/filter and Dif. fluid..Individual also found 3 of the 4 bolts to the driveshaft loose with #4 missing...These were secured and missing bolt replaced.
Also found out this super people also work on all types of AC units for different vehicles, so was not an issue with them when I meantioned what I desired (Larger Orifix, replacement for Evap. and total service of new R-134a).

Drove to the border (10 min away), and returned to the apartment where I noticed my temp gage was past 240/250....Shut down the rig to let her cool down.

After reading your post and others relating to AC/Fan woes...I crawled under to have a look at the wires. Saw the main wiring assy disconnected. It did not want to stay connected, but finally got her inserted. Will keep watch to see that it remains as such, and makes any difference as I have no clue how long this has been this way. Don't believe very long though.

Researched on the net for a decent aftermarket dual electric fan unit w/thermostat. Found one at Advance Auto Parts as was a newer style (Fan blades similar to my Porsche..Aftermarket but much gains). Can view at their web site i.e. Imperial Dual Electric Fan Kit P/N: 226100 $189. Believe much better than stock!!

Tomorrow will check out the fan clutch as per past links within DTR.

Can see you are pretty active in the posts...Very knowledgeable, hat's off to you my friend...enjoy your weekend!!

Spooler

Cool, unplugged is always an easy find...LOL Keep an eye on it, you may or may not have it fixed. Somebody didn't do you any favors, that's for sure.

lampltr

Believe I will start a new thread; Cooling Fan, Flex -vs- Electric. Was doing some research here and other places and have heard many variations. As far as here, did not see anything as yet. Looking for viable options. Have heard the Black Magic #150 is the boss, but then too I see good replacements; http://www.autopartsdeal.com/Parts_L...odge/ram_3500/
The research continues......

So far my plug has not disconnected, will keep watch of it for sure. Have a sm zip tie just in case. Could of been a possibility of accidental disconnection when installing the Buckstop bumper, but disconnecting these Dodge connectors is something else :-)

Plesent weekend to all!!