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seized compressor 96 VW Passat tdi

opthmbs on Mon April 20, 2009 2:48 PM User is offline

Year: 1996
Make: VW
Model: passat



Compressor seized on 96 passat tdi. Causing belt to burn through.

car is still drivable short distances (no ac of course and no alternator).
I have ordered a rebuilt compressor, drier and...

What is my best strategy?
My plan is to drive to ac service shop and have them evacuate ac system.
Remove and replace components leaving stuff disconnected.
At this stage I assume I have to flush the old components.

Can I flush and clean system myself?
Or do I go to service station and have them flush everything.

Thanks.

TRB on Mon April 20, 2009 2:58 PM User is offlineView users profile

Check out the procedures Karl has listed for flushing in the flushing forum on this site. With the correct equipment and some effort you should be able to get your system clean of debris and old oil.

Thanks for the support and let us know if you have some follow up questions.

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mk378 on Mon April 20, 2009 3:15 PM User is offline

Is the compressor completely seized, or just the pulley bearing? If you can still turn the inner shaft that drives the compressor itself, the internals should be OK, and debris would not be an issue. Heat from the bearing may have melted the shaft seal and caused a leak though, best solved by replacing the whole compressor.

opthmbs on Thu April 23, 2009 4:13 PM User is offline

Not sure where the compressor/clutch is seized.

I just got the car back today from the AC shop that sucked the
refrig from it.

Car is going into the garage and I will have at R&R of
compressor.

opthmbs on Thu April 23, 2009 4:31 PM User is offline



OK. I just got the compressor (nothing else yet.)

If the compressor is not on the "list" of compressors
and oil quantity. How does one find out
proper oil quantity? I note in the table that most
(all) SDxxx compressors call for 6oz.

SD7V16 compressor is what it is supposed to be
(that is what is on the old one)
New compressor says SDV7AB on it. The same??

Thanks

TRB on Thu April 23, 2009 7:16 PM User is offlineView users profile

Mitchell has 4.5 ounces listed for this system.

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opthmbs on Sun April 26, 2009 3:11 PM User is offline

Quote
Originally posted by: TRB
Mitchell has 4.5 ounces listed for this system.

opthmbs on Sun April 26, 2009 3:26 PM User is offline

Quote
Originally posted by: opthmbs
Quote
Originally posted by: TRB
Mitchell has 4.5 ounces listed for this system.

What kind of oil? there are several available?

Also the compressor is slightly different
than original. (end plate is different where
hoses attach)

TRB on Sun April 26, 2009 3:34 PM User is offlineView users profile

PAG 150

Different that it's not going to work for you?

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opthmbs on Sun April 26, 2009 6:04 PM User is offline

Quote
Originally posted by: TRB
PAG 150



Different that it's not going to work for you?

Not sure till I reinstall everything. Hoses will be
in different location and dif orientation.


After I get my new drier and it looks like a
match, my plan is to band saw the old one in half
and see if it is contaminated . What should I look for?

opthmbs on Mon April 27, 2009 5:09 PM User is offline

I got the rest of my AC toy box today.

The drier looks to be a good match so I took the
band saw to the old one. Nothing too bad in there just some black
dis-coloring that wipes off. Is this a bad sign?


HECAT on Tue April 28, 2009 9:49 AM User is offline

Quote
Originally posted by: opthmbs
Nothing too bad in there just some black

dis-coloring that wipes off. Is this a bad sign?

A black or gray residue that wipes off is normal and will be found on the inside of the entire system. This is an indicator (residues) of oil break down that occurs over time due to the extreme heat and pressures. That is why it is advantageous to flush and remove all the old oil (tired and contaminated) and start with fresh oil.

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FLUSHING TECHNICAL PAPER vs2.pdf 

opthmbs on Tue April 28, 2009 9:44 PM User is offline

That pretty much describes it. gray residue that
wipes off.

I flushed the condenser today and replaced the evap
valve. The evap valve came with 5 orings. Damn if I
could find where that fifth one went. Did I miss something???

Glad that wife has another car to drive while
I play car scientist.


Quote
Originally posted by: HECAT
Quote
Originally posted by: opthmbs
Nothing too bad in there just some black



dis-coloring that wipes off. Is this a bad sign?



A black or gray residue that wipes off is normal and will be found on the inside of the entire system. This is an indicator (residues) of oil break down that occurs over time due to the extreme heat and pressures. That is why it is advantageous to flush and remove all the old oil (tired and contaminated) and start with fresh oil.

opthmbs on Fri May 01, 2009 6:31 AM User is offline

Quote
Originally posted by: opthmbs
Quote
Originally posted by: TRB
Mitchell has 4.5 ounces listed for this system.


Is that 4.5 oz for entire system or for pump?

I drained the pump; it came shipped with over 8oz


-Almus

TRB on Fri May 01, 2009 9:39 AM User is offlineView users profile

Mitchell list that as the total system capacity. Napa lists 4 ounces, I would add 6 myself.

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