I don't see many diesel questions on here when it comes to AC But first i want to introduce myself to the forum. I'm a diesel mechanic and mostly work on AC's in our shop. We run old Kenworths. We have between 1973-2003. They are all basically the same when it comes to ac except the older ones nothing goes through the computer. Anyway, my first question is, sometimes when i recover the system to work on the system and the drier freezes up, does that mean the drier is junk? some say yes and some say no, and some say all depends on how far up it freezes. I mean you can peel the ice off with your fingernail on some of them. on one i changed the drier and i had to pull it down again because i seen a line was a little oily and the new one froze up as well. Can someone explain what's going on here? I'm using 134r by the way
That just means there happened to be a quantity of liquid refrigerant resting in the drier before you started. While you drop the pressure to recover the refrigerant it will naturally turn to gas, which makes it get cold. It doesn't mean the drier is bad, or that it is good either. When there's any question about the condition of a drier, replace it. It's an expendable part like an oil filter.
Now when running a TXV system and you see cold / ice on a drier or the drier outlet line during operation, that means the drier is clogged up and causing a severe restriction and pressure drop. It is bad. That is probably what your colleagues are thinking of.
Edited: Wed May 04, 2011 at 8:47 PM by mk378
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