Aux air problem
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Elder User
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From: Houston, TX
Aux air problem
Does anyone know the orientation of the orifice tube in the auxiliary a/c? The one in the front goes in short end first. I also installed the one in the aux unit that way (short end first). I am hardly getting any cold air out of the back. I took the housing apart again and monitored it for a while with the a/c running. The tubing sweats all the way to the evaporator. I checked the surface of the evaporator and only the lower right hand corner feels really cold, i.e. maybe about 15 percent of the surface area of the evap core. Is it possible that I have the orifice tube in backwards??????
Klaus Cook
Houston, Texas
Klaus Cook
Houston, Texas
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Joined: Apr 2005
Posts: 5,720
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From: Washington state
should have been a flow direction arrow on orfice tube, usually on tab end opposite from screen end
flow is usually from screen end to tab end
1. screen end
2. middle with O rings and orfice
3. tab end
screen needs to been prior to orifce in refrig. flow
is the rear aux unit refri. solenoid valve functioning and was it completely clear after flush?
flow is usually from screen end to tab end
1. screen end
2. middle with O rings and orfice
3. tab end
screen needs to been prior to orifce in refrig. flow
is the rear aux unit refri. solenoid valve functioning and was it completely clear after flush?
Last edited by 96_4wdr; Jul 4, 2006 at 08:25 AM.
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Elder User
Joined: Aug 2003
Posts: 624
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From: Houston, TX
Originally Posted by 96_4wdr
should have been a flow direction arrow on orfice tube, usually on tab end opposite from screen end
flow is usually from screen end to tab end
1. screen end
2. middle with O rings and orfice
3. tab end
screen needs to been prior to orifce in refrig. flow
is the rear aux unit refri. solenoid valve functioning and was it completely clear after flush?
flow is usually from screen end to tab end
1. screen end
2. middle with O rings and orfice
3. tab end
screen needs to been prior to orifce in refrig. flow
is the rear aux unit refri. solenoid valve functioning and was it completely clear after flush?
Solenoid clicks on and off and the evaporator cools right at the refrigerant entry point, an area about the size of a tennis ball.
Could it possibly be oil buildup at the orifice? I remember when I first pulled it apart a lot of oil (approx 1 oz.) dripped out.
Elder User
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I have noticed many times that people get the flow directions of refrigerant wrong. I have won many beer bets by asking someone to feel the refrigerant tubes and tell me the direction of flow. Most think the cold one goes to the evaporator when in fact the hot line flows to the evap.
In the original post the writer says the tubing is sweating (cold) all the way to the evaporator. This is wrong. The tubing is sweating all the way FROM the evaporator. This indicates cooling is happening and the problem is airflow. the hot (liquid) line flows into the evaporator and the cold line can be considered exhaust flowing to the suction side of the compressor.
Do not mess with restrictor fittings when the suction line is cold. check airdoors and heater valve failures.
Ken
In the original post the writer says the tubing is sweating (cold) all the way to the evaporator. This is wrong. The tubing is sweating all the way FROM the evaporator. This indicates cooling is happening and the problem is airflow. the hot (liquid) line flows into the evaporator and the cold line can be considered exhaust flowing to the suction side of the compressor.
Do not mess with restrictor fittings when the suction line is cold. check airdoors and heater valve failures.
Ken
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Elder User
Joined: Aug 2003
Posts: 624
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From: Houston, TX
Originally Posted by ken1mod
I have noticed many times that people get the flow directions of refrigerant wrong. I have won many beer bets by asking someone to feel the refrigerant tubes and tell me the direction of flow. Most think the cold one goes to the evaporator when in fact the hot line flows to the evap.
In the original post the writer says the tubing is sweating (cold) all the way to the evaporator. This is wrong. The tubing is sweating all the way FROM the evaporator. This indicates cooling is happening and the problem is airflow. the hot (liquid) line flows into the evaporator and the cold line can be considered exhaust flowing to the suction side of the compressor.
Do not mess with restrictor fittings when the suction line is cold. check airdoors and heater valve failures.
Ken
In the original post the writer says the tubing is sweating (cold) all the way to the evaporator. This is wrong. The tubing is sweating all the way FROM the evaporator. This indicates cooling is happening and the problem is airflow. the hot (liquid) line flows into the evaporator and the cold line can be considered exhaust flowing to the suction side of the compressor.
Do not mess with restrictor fittings when the suction line is cold. check airdoors and heater valve failures.
Ken
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