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VW MKIII-A3/B4 TDIs This is a discussion about MKIII-A3/MkIII Jetta/Golf (<99.5) and B4 Passats (96,97) TDI's. Non TDI related postings will be moved or removed.

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Old September 13th, 2017, 12:38   #1
ejallison1
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Default AC Questions B4

Am repairing AC since radiator sprung a leak.

Putting in new:

Condenser
Air Drier
Expansion Valve
New seals on above

I've heard about the "black death" but this is my first go around with AC system other than using gauges to charge the system. The little bit of old PAG 46 oil I see draining from the old condenser is black but I am not seeing any aluminum flakes or streaks in it. Is that normal? The whole system was changed out by previous owner about 6 years ago and car has had little AC use since then.

AC compressor has never made any funny noises. Would not charge up completely earlier this summer. Low was a little high at high 30's and high side would go to 150. Although it did cool better it was still not cold enough.

Thanks
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Old September 13th, 2017, 13:03   #2
Windex
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Define "would not charge up"

The low side of an A/C system can more than accommodate a proper charge and then some. If the car would not take a full charge, then something is not quite right.

I have seen black AC oil - not great. If you are going to the extent of replacing all those parts, it would be a good idea to remove the compressor from the car, and tilt it upward to drain as much of that blackish oil out as you can, then replace with new PAG oil.
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Old September 13th, 2017, 14:27   #3
ejallison1
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Thanks Windex. Just got off the phone with PolarBearinc.com and am having a new aftermarket compressor shipped. They warned to thoroughly clean the lines with the non-mineral oil based cleaner. Said the good stuff was highly flammable. According to them if oil is black it is not good as you mentioned.


I could not get the ac system in the 20's on the low side and 200's high side and I patiently waited to empty the can(s)-just wouldn't take a charge. Ambient temp was in high 80's F.
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Old September 15th, 2017, 07:24   #4
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Quote:
Originally Posted by ejallison1 View Post
Am repairing AC since radiator sprung a leak.
so this is your engine radiator or your AC 'radiator'(youd mean condenser)
from what your saying youve got problem(s) you need to trace down. new parts may do it. it may be compressor, or any one or more parts. you have quite a few. of course finding why you have contamination,black oil will help, perhaps be your (underlying) problem..?.
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Old September 15th, 2017, 22:55   #5
ejallison1
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The engine radiator sprung a leak so since I had to take the front end off to replace it I decided to fix the AC as well. AC has been out for a year or better. Awaiting new compressor arrival and flammable AC Flush. Have in hand the expansion valve, air drier/accumulator, new condenser, new hi low switch.
Have tested the fan and the fan control module which are working correctly. Will need to flush lines and install.
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Old September 16th, 2017, 04:56   #6
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In addition to the lines, flush the evaporator and the new condenser.

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Old Yesterday, 20:26   #7
ejallison1
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This is my first rodeo with the AC so am a little curious as why to flush a brand new condenser-just to make double sure it is clean??
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