Recent Topics
Adding fuel filter- Generator built with no filter
by rubberchicken. 09/23/18 09:57 PM
Clutch Engaging too low
by Spetz. 09/23/18 09:41 PM
SMA - Krown previously, Fluid Film Application
by StevieC. 09/23/18 09:21 PM
First Paint Correction
by RayCJ. 09/23/18 08:33 PM
2011 Dodge Caliber
by dogememe. 09/23/18 07:48 PM
Mixing transmission fluids - partial change
by spk2000. 09/23/18 07:31 PM
Counterfeit MANN filter???
by IllinoisSparky. 09/23/18 06:54 PM
The smell of an oil: VME adds?
by fdcg27. 09/23/18 06:48 PM
Classic road brake pads
by buck91. 09/23/18 06:18 PM
Air up your vehicle's tires
by Papa Bear. 09/23/18 06:07 PM
A cool litttle Fall foliage site
by Papa Bear. 09/23/18 06:02 PM
Suggestion: "Likes"
by SnowDrifter. 09/23/18 05:36 PM
Condensation in headlights?
by irv. 09/23/18 05:06 PM
Nissan VQ V-6 Engines
by Al. 09/23/18 04:57 PM
List of dexos licensed oils?
by k1xv. 09/23/18 04:24 PM
High flow oil pump? Thinner oil?
by SnowDrifter. 09/23/18 04:06 PM
Is Tiger back?
by gman2304. 09/23/18 03:51 PM
Newest Members
Lilshady, SevenDu, sigpro, RayCJ, yellow97tt6spd
66055 Registered Users
Who's Online Now
77 registered members (A310, aquariuscsm, 4WD, antonmnster, alphadog, 408lsxs10, 9 invisible), 1,446 guests, and 32 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Most Online3,590
Jan 24th, 2017
Donate to BITOG
Previous Thread
Next Thread
Print Thread
Hop To
AC line freezing on truck #4544411
10/15/17 08:38 PM
10/15/17 08:38 PM
Joined: Nov 2009
Posts: 4,943
Houston, Texas
motor_oil_madman Online content OP
motor_oil_madman  Online Content OP
Joined: Nov 2009
Posts: 4,943
Houston, Texas
So I asked a question about the ac blowing hot and cold randomly on my truck and I looked at it today and put my hand on the accumulator/drier and it was about as cold as a can of coke, maybe a little warmer. the two lines coming out of it were even colder like 40 degrees. Now their was another long line that went from the firewall over to the fender well and it looked like it was painted white, but it turned out it was actually ice!

Any ideas on what's going on? Is it low on Freon? I did have them replace everything but the condenser and the evaporator core.

2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: AC line freezing on truck [Re: motor_oil_madman] #4544417
10/15/17 08:47 PM
10/15/17 08:47 PM
Joined: Sep 2015
Posts: 1,529
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,529
I'm assuming this is like most American trucks and a CCOT system. The accumulator and large line leaving the evaporator should be slightly colder than the small line going in after the orifice tube. If you look closely, that line on the fender should come from the condenser. Somewhere between there and the cabin there will be a connection and at that point it changes from warm to cold. Inside that connection is the orifice tube.

What you have (plenty cold after the OT, but only moderate at the evaporator outlet) is a sign of undercharging. Put an accurate thermometer (not an IR gun) in one of the vents and observe the air temperature inside. It should be close to 40 F.

A tendency for the whole system to ice up means that the pressure switch is not working, or the refrigerant is contaminated with air (from improper servicing.)

Re: AC line freezing on truck [Re: motor_oil_madman] #4544423
10/15/17 08:50 PM
10/15/17 08:50 PM
Joined: Jun 2003
Posts: 17,362
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,362
Deplorable in apple valley, ca
What mk378 said. Its not cycling out for some reason. Your orifice is behind the passenger side battery on that truck and should be cold from that point on.

02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

BOB IS THE OIL GUY® Powered by UBB.threads™