Recent Topics
One Dollar Per Gallon?
by Y_K
06/18/18 11:53 PM
Walmart Tightening up Returns
by John_K
06/18/18 10:21 PM
flare nut wrench set
by spasm3
06/18/18 09:46 PM
Auto trans temperature scanner - help!
by JeffKeryk
06/18/18 09:45 PM
How much is too much?
by Sealbilly
06/18/18 09:34 PM
Correct oil filter for a Vovlo S60, 2003
by earthworm
06/18/18 09:17 PM
Prestone coolant $3.50 Target YMMV
by pda1122
06/18/18 09:13 PM
Need Windows 7 Pro ISO
06/18/18 08:33 PM
PEAK Full Synthetic -- Anyone Try It ??
by johnnyz73
06/18/18 07:40 PM
Why high resale value on Jeeps if frames rust out?
by Vern_in_IL
06/18/18 06:48 PM
Wearever Silver Semi-Metallic Brake Pads- Break In
by ET16
06/18/18 06:37 PM
Where to Buy Motul Oil in Stores?
by Hot_Ajax
06/18/18 06:13 PM
2011 Chevy equinox overheating
by hardcore302
06/18/18 06:00 PM
Are my rotors warped?
by Dylan1303
06/18/18 05:44 PM
Ultimate Fast Finish on sale at CDN tire.
by irv
06/18/18 05:23 PM
96 Civic 5w20 Castrol GTX Ultraclean UOA
by researcher
06/18/18 04:52 PM
VOA Castrol Magnatec D1G2, 5w30
by researcher
06/18/18 04:38 PM
Unused dented silicone Fram PH8316 cut open
by slacktide_bitog
06/18/18 04:28 PM
Same grade with differing low start temps
by mjoekingz28
06/18/18 04:24 PM
Self defense
by Camprunner
06/18/18 03:13 PM
Newest Members
JustaDude, 3horseman, Firedog45, WtsTacoma01, Orion62
65265 Registered Users
Who's Online
41 registered (Atesz792, BigJakeChevy, AVB, bbhero, 2strokeNorthstar, Aero540T, 3 invisible), 983 Guests and 38 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65265 Members
67 Forums
285570 Topics
4765603 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#4544411 - 10/15/17 08:38 PM AC line freezing on truck
motor_oil_madman Offline

Registered: 11/29/09
Posts: 4838
Loc: 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.

#4544417 - 10/15/17 08:47 PM Re: AC line freezing on truck [Re: motor_oil_madman]
mk378 Offline

Registered: 09/27/15
Posts: 1414
Loc: USA
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.)

#4544423 - 10/15/17 08:50 PM Re: AC line freezing on truck [Re: motor_oil_madman]
Chris142 Offline

Registered: 06/05/03
Posts: 16817
Loc: 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