A/C compressor short cycling, a bit of advise please.

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PlayingWithTBI

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It was about 62 degrees in the garage with the door open and the fans on so it was not very warm today.
Then your pressures are way too high. Can you recover 12 oz and try again?

Otherwise, you may need to evacuate and start over - look at the orifice tube 1st. That little screen in it can plug up quickly.
 

evilunclegrimace

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Front ac only? My 99 Tahoe with rear air is 11 oz PAG and 64oz which is 4 lbs of R134a. My Express van with aftermarket rear air takes 12 oz PAG and 68oz R134a per the specs.

At 435 PSI you have a restriction in the high side or lack of airflow across the condenser.
And Yes front A/C only
 

evilunclegrimace

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I am thinking that the fluid line is the problem. There are two filters(?)in the line set, one in the suction side before the compressor and one on the high side after the compressor and before the condenser. Possibly to protect the compressor and condenser?
 

Schurkey

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There are two filters(?)in the line set, one in the suction side before the compressor and one on the high side after the compressor and before the condenser. Possibly to protect the compressor and condenser?
There'd be a desiccant pouch in the suction side; and perhaps a muffler in the compressor outlet. I wouldn't expect two filters.

400-plus psi at 60 degrees is crazy high. Sure you got the correct orifice tube installed? They're color-coded for orifice size; but it's easy to think the one you took out is "black" when it wasn't black when new.

This is the "white" orifice tube I pulled out of my quarter-million-mile AC system on the Trailblazer, along with the new orifice tubes that came in the "kit".
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HOW did you measure the "36 ounces" of refrigerant you installed? When using the "pounder" cans, the usual problem is folks don't put enough in. (The "one pound" cans generally have 12, sometimes 14 ounces rather than 16 ounces of refrigerant in them.)

Are you CERTAIN you're getting proper airflow through the condenser?

Does the pressure drop when you spray the condenser with mist from a garden hose?
 

evilunclegrimace

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There'd be a desiccant pouch in the suction side; and perhaps a muffler in the compressor outlet. I wouldn't expect two filters.

400-plus psi at 60 degrees is crazy high. Sure you got the correct orifice tube installed? They're color-coded for orifice size; but it's easy to think the one you took out is "black" when it wasn't black when new.

This is the "white" orifice tube I pulled out of my quarter-million-mile AC system on the Trailblazer, along with the new orifice tubes that came in the "kit".
You must be registered for see images attach


HOW did you measure the "36 ounces" of refrigerant you installed? When using the "pounder" cans, the usual problem is folks don't put enough in. (The "one pound" cans generally have 12, sometimes 14 ounces rather than 16 ounces of refrigerant in them.)

Are you CERTAIN you're getting proper airflow through the condenser?

Does the pressure drop when you spray the condenser with mist from a garden hose?
There'd be a desiccant pouch in the suction side; and perhaps a muffler in the compressor outlet. I wouldn't expect two filters.

400-plus psi at 60 degrees is crazy high. Sure you got the correct orifice tube installed? They're color-coded for orifice size; but it's easy to think the one you took out is "black" when it wasn't black when new.

This is the "white" orifice tube I pulled out of my quarter-million-mile AC system on the Trailblazer, along with the new orifice tubes that came in the "kit".
You must be registered for see images attach


HOW did you measure the "36 ounces" of refrigerant you installed? When using the "pounder" cans, the usual problem is folks don't put enough in. (The "one pound" cans generally have 12, sometimes 14 ounces rather than 16 ounces of refrigerant in them.)

Are you CERTAIN you're getting proper airflow through the condenser?

Does the pressure drop when you spray the condenser with mist from a garden hose?
Thanks for the reply Schurkey. I am certain that there enough air flow across the condenser. I am going to double check the orifife tube this morning,. As far as the R-134 volume I used the 12 oz Artic-Air cans. they weigh 15.3 oz full and 4 oz empty so each can has a freon charge of 11.3.(approx) oz so I might be 2-3 oz shy of a full charge using 2 cans ( I did weigh them all)
 

evilunclegrimace

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I think that I found the problem,the orifice tube is all the way down to the bend the the condenser line, about 2 5/8" down, not really sure how that happened. I know that I only pushed it in about 1/2". Now to see if I can get it out.
 

HotWheelsBurban

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I think that I found the problem,the orifice tube is all the way down to the bend the the condenser line, about 2 5/8" down, not really sure how that happened. I know that I only pushed it in about 1/2". Now to see if I can get it out.
Those are bad about doing that. There's supposed to be bumps in the tube that the orifice goes into, to keep it from doing this, but it doesn't always work. There's also a tool to get the orifice tube out, when it goes too far in. Looks like a teeny sewer snake.
 

evilunclegrimace

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Those are bad about doing that. There's supposed to be bumps in the tube that the orifice goes into, to keep it from doing this, but it doesn't always work. There's also a tool to get the orifice tube out, when it goes too far in. Looks like a teeny sewer snake.
Do you know who makes this extractor?
 

evilunclegrimace

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Well, this is getting old fast. New condenser, new white orifice tube, vacuum the system down, hook up the gauges, start adding r-134a and after a few clutch cycles the pressure climbed to 425 psi. Shut everything down emptied the system and checked the orifice tube. It is down to the bend the the line and I can not reach it with an extractor. :fca5278d: :fca5278d: :fca5278d:
 
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