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2000 Ford Excursion condensor replacement

2000 Ex on Mon July 27, 2009 4:55 AM User is offlineView users profile

Year: 2000
Make: Ford
Model: Excursion
Engine Size: 7.3L
Refrigerant Type: R134
Country of Origin: United States

Hi,
Recently joined after running across this forum on the internet. I'm going to change the condenser on my 2000 Excursion. While in the process, the receiver/drier as well as the orifice tube will also be changed. There was no catastrophic failure of any component, so I don't anticipate the need to flush the system. Before this happened, the a/c was cooling pretty well, so I'm hoping to replace the damaged part, along with the receiver/drier and orifice tube, pull a vacuum and charge the system. The questions that I have are:
1) How much oil should I add to the system?
2) What kind of pressures should I be looking for?
3) Amount of refrigerant to add?
This vehicle also has a rear evaporator if that factors into any of the concerns above.
Thanks for the advice.

Eddie

Chick on Mon July 27, 2009 6:18 AM User is offlineView users profile

Front and rear AC holds 68 ounces of R124a, system total of oil is 14 ounces. So I'd add back 4 ounces of oil if just the accumulator and condenser are being changed.. Charge into a deep vacuum the system amount, and just use pressures to check perfomance.. You can't charge them by pressures..To many vaiables.. But, check for the undr hood ;abel to be sure of the system refrigerant capacity, it should tell you the amounts for both single and dual air systems... Hope this helps..

Refrigerant capacity for 2000

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

2000 Ex on Mon July 27, 2009 6:54 AM User is offlineView users profile

Thanks,
After I had posted this I found the spec sheet you had listed for the capacities of the system. I wasn't sure how much I should add since I am changing out two of the major components. I figured that there would be some oil left in the system, just not sure how much. As for the charge, I will be charging by weight, not by pressure, but what would be normal operating pressure once the system is fully charged. I have been told to look for between 200-300 on the high side and 20-30 on the low side. Thanks again for the advice. Great site, by the way. Glad I found it!

2000 Ex on Tue July 28, 2009 8:08 PM User is offlineView users profile

Installed the new condenser today. Unfortunately, the rec/drier is on order and will not be here till in the morning. I'm having trouble locating the o-tube. I've checked the fittings at the condenser, and the rec/drier with no luck. Any tips where I should look next?

Chick on Tue July 28, 2009 9:04 PM User is offlineView users profile

Inlet to the evap maybe? or a connection in the line between the condenser and evaporator.. , your truck should have an accumulator on the low side, driers on the high side would have expansion valves not O tubes...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

knightgang on Tue July 28, 2009 9:16 PM User is offline

Chick, is that a standard assumption for most vehicles (domestic anyway), that acculators on the low side = OT and drier on the high side means TXV.

Thanks...

2000 Ex on Tue July 28, 2009 10:41 PM User is offlineView users profile

Rec/drier, or accumulator, or dehydrator not sure of the correct terminology. I've always known it as the receiver/drier. Anyway, the low side coming out of the evap. goes in to the rec/drier, then back to the compressor, if I'm looking at it correctly. Went back out and checked all high and low side lines from the comp. to the condenser, to the rec/drier, to the evaporator and there is not an orifice tube in any of the lines. Looked at the connection to the compressor, nothing there either. Started looking around the rear evaporator and I found what I believe is an expansion valve at the connection to the rear evaporator. If this is the case, do I not have an orifice tube? Thanks for all the help!

Edited: Tue July 28, 2009 at 10:47 PM by 2000 Ex

Chick on Tue July 28, 2009 10:52 PM User is offlineView users profile

Yes, you will need an expansion device for the front also, I haven't worked on an excursion yet, but maybe someone here can shed some light on it, but it has to be between the condenser and the evaporator.. If there is a fitting on the line going from the condenser, it should be there if not in the inlet of the evap..There is usually three dimples on the line if the O tube is there, but you won't see it if it's sticking into the evap of course.. If you have an accumulator on the low side, then there is an O tube on the high side.. Rear evaps can use an O tube or expansion valve as you have found...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Chick on Tue July 28, 2009 11:04 PM User is offlineView users profile

It is also possible that you have a liquid line with the O tube part of it, which means the liquid line needs to be replaced, but since you have rear air also, find where the line splits from the condenser to the evap, and then goes to the rear, it will be between there and the front evaporator..Or it may be stuck into the inlet of the evap, but it has to be there...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

2000 Ex on Wed July 29, 2009 6:14 PM User is offlineView users profile

Spent couple of hours this morning looking for the o-tube while waiting for parts to show up. Finally gave up. The only thing I can figure is that it is what Chick said in the above post about being part of a liquid line. I figured since it was cooling well before that there should be no issues with it now. Got the new rec/drier (or accumulator, or dehydrator) installed, added about 4-5 ounces of oil and pulled a vacuum for about an hour. Just wanted to make sure any moisture that had accumulated in the system over the last week had boiled off. Shut off pump and system held good vacuum (-29) for 30 minutes. Got 60 ounces in and kind of had to guess on the last 8 ounces (since I had 6 12 ounce cans). Temps coming out of the vents were 60 degrees sitting in the garage. Once I started driving around, and got good airflow over the condenser, they dropped another 8-10 degrees. Outside temps were 88 degrees according to the overhead gauge in the truck. Pressures sitting at idle were 250 on the high side and 45 on the low side. I'm happy. Hopefully, this will last for sometime without another component failure.

Eddie

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