Join Date: Apr 2008
Location: Beeville, TX
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The orifice tube is in the small line going into your evaporator core. There is a little crimped spot in one of the lines about 3" from a connection. Open the connection, and take a pair of needle-nosed pliers and pull it out carefully. If is is grayish and greasy feeling, it's alright just to put another one back in. If it comes out with big flakes of aluminum and crap on it, then you might need to flush the lines before you re-assemble the system.
The last thing is that you will want to vacuum the system before you have more refrigerant put back in. It will get most of the moisture out of it, and it will cool a lot better. You can rent an electric vacuum pump at Auto Zone. One last thing, you need to put oil in the system. The parts store can tell you what kind, and hoe much. Put an ounce in the suction line of the compressor a few drips at a time, and turn the compressor over a dozen times by hand. Then put the rest of the amount into the drier.
It's all pretty easy to put together. The only special tool you will need is a set of A/C line disconnect thingys. They are more or less the same things as fuel line disconnect tools, but bigger.
Eli Benson - EMT, Ambulance Mechanic
'08 F350 Dually KR - Spartan'd
'07 F250 CC SB 4x4 XLT - SCT /w Innovative Tunes
4 '09 & '10 E350 6.0l ambulances
1 '08 Duramax 6.6 (LMM) van ambulance