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AC line freezing on truck #4544411
10/15/17 08:38 PM
10/15/17 08:38 PM
Joined: Nov 2009
Posts: 5,218
Houston, Texas
motor_oil_madman Online content OP
motor_oil_madman  Online Content OP

Joined: Nov 2009
Posts: 5,218
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: 1,690
USA
mk378 Offline
mk378  Offline

Joined: Sep 2015
Posts: 1,690
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.)

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: 18,395
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline

Joined: Jun 2003
Posts: 18,395
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.


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