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evaporator flush

uawelder on Wed June 02, 2010 7:56 PM User is offlineView users profile

Year: 1983
Make: Isuzu
Model: Pup (pick up)
Engine Size: 2.2
Refrigerant Type: retrofitting
Country of Origin: United States

I am restoring an 83 pup diesel the compressor had been removed before I got the truck. I got a compressor off a truck that had been sitting for years intact. I want to flush everything but do it on the truck espiecally the evaporator because I have all new upholstery and don't want the mess and work. Can the evap. be flushed on the truck? Thanks in advance. Also I see where one of my comrades "Joe Isuzu" is also asking questions so I will be getting some help from you by way of him. Thanks Ron

ronald r bird

robs on Thu June 03, 2010 12:06 AM User is offlineView users profile

Evaporator should be able to be flushed without pulling the dash. Would not recommend using a compressor that has been sitting for a while. O-rings dry up and eventually leak on compressors that have not been ran for a while or have been "sitting for years".

HECAT on Thu June 03, 2010 6:33 AM User is offline


Not sure of the exact configuration of the 83 Pup, but as long as the TXV (or OT) can be removed without tearing into the dash; then tearing out the dash to clean the evap is not be necessary.

Regardless of the type, the orifice must be removed to allow for flushing liquid flow and velocity; and also to allow for a generous volume of dry air to evaporate all the solvent. If the TXV is mounted to a tight manifold at the firewall, then a new TXV should be purchased (recommended anyway) and the old one drilled open (homemade flushing fixture, keep it) and reinstalled for flushing. This will allow for you to connect to and use the hoses to perform the flush (hoses also need to be cleaned anyway).

Testing should be done to confirm the component is clean and dry before reassembly and you can read more about that in the file attached below.

You will need a new filter/dryer and flush the condenser circuit (w/ hoses) also. Since so much time and expense has to be put forth to clean this up ready for a fresh oil load and a new compressor; I agree with Robs suggestion not to use a used compressor as you may just find yourself doing this all over again in short time.


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