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Air con. fixed today... (long-ish)
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Posted by BillJ (more from BillJ) on Tue, 3 Jul 2001 16:08:32 Share Post by Email
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... on my '96 Aero (148K miles) and I wish I'd kept following the thread I started after it disappeared off the front page of this BBS!

Symptom was that the air con. would stop working once the under-bonnet (under-hood) temperature rose, as when sitting in traffic on a relatively warm day. It wouldn't work until the car had been left to cool for a while. It has been getting worse and worse.

I left it in with an A/C specialist today. First thing he did was to drain and refill the system and found the Saab dealer who refilled it previously had put in far too much oil. He also bypassed the pressure switch. I wasn't sure about this, but he assures me Saab are among the few who fit this switch (he drives a 9000 LPT), he's seen them go faulty and they aren't available (to him, at least) without the compressor.

He said to let him know in a few days whether it was fixed. I was back after 10 minutes' driving in 28 degree weather (that's 82 degrees to most of you folks).

Now he could examine the fault, he sorted it out in 10 minutes as I watched carefully. Turns out Robert Kaplan was correct. The problem was too wide an air gap on the clutch, so it wouldn't engage when, I presume, the magnetic coil resistance rose with the heat.

The A/C tech. checked it was the clutch by checking there was voltage to it - there was, but it wouldn't engage. He tapped it with a hammer and it engaged! Then he took the clutch plate off (one Allen screw in the centre), removed a couple of shims from underneath and replaced the clutch plate. The plate is very worn after almost 150K miles of cycling on and off - not surprising that the gap had increased. This was only the second time he had seen this fault.

I did about 20 miles of driving in traffic in the same 28-degree weather and am convinced it is fixed. Although it now performs better than it has for a long time (due, I think, to having had far too much oil in the system), I wish I'd seen Robert's post and tried fixing the clutch myself!
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