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2002 Explorer leak at back of compressor

spit on Sun September 11, 2011 7:03 PM User is offline

Year: 2002
Make: Ford
Model: Explorer
Engine Size: 4.0
Refrigerant Type: R134

I just changed out the accumulator on my daughter's 2002 Explorer. The accumlator definitely was bad there was a 1/4 inch corrosion hole in the base. I pumped it down( I thoght it was holding vacuum) recharged it and thought all was good.. 2 weeks later no R134 in the system I looked over the whole system a 2nd time... and now I see that on the backside bottom of the compressor there is fresh AC oil. Looks like it's on the seam where the end cap of the compressor is bolted on... I am thinking that the seals on the case of the compressor are bad. I am wondering if anyone out there with more experience can confirm this is something that happens on these. What procedures would you recommend that I try to attempt to identify the leak?

The system is evacuated at this time. I have a vac pump, guage set and an inexpensive Halogen leak detector (all from Harbor Frieght)
I do have some dye that I can use also. I don't see any signs of oil leaks @ the condenser. Not sure how to check for leaks @ the evaporator, None of the exposed hoses and connections seem to be wet with oil.

If it was your's how would you go about troubleshooting? I don't want to waste a lot of cash on R134 that just going to leak out..but I know I'll have try something wanting to be efficient.

All advice welcome!!


JACK ADAMS on Mon September 12, 2011 4:34 PM User is offline

If this is something you think you may be able to do, you could replace the seals in the compressor. does offer a seal kit less the shaft seal. Kit # 21-24680 sell for under $20 bucks, the shaft seal Kit# 21-34626 and it sells for under $30 bucks. Also use Blue Nylog on the case seals. Give one of the sales staff a call if you wish to try it. Good luck and hope this helps.

spit on Mon September 12, 2011 9:00 PM User is offline


Thanks for the it a fairly common that the rear seals go bad on this type of compressor? If I was replacing the rear seals would it make sense to to the front seals also? Do you have any suggestions on narrowing in on the source of the leak?



mk378 on Mon September 12, 2011 9:14 PM User is offline

Case leaks are usually because of corrosion working its way underneath the big o-ring that seals the case halves together. This is the sort of leak that might hold vacuum but not pressure.

JACK ADAMS on Tue September 13, 2011 12:36 PM User is offline

FS10 compressors are common to leak in the case seals as well as the shaft seal. If you do decide to take on this task, you will want to replace all seals because once you take it apart you will compromise the other seals ability to keep them from leaking. Good luck.

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