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Discussion Starter #22
its a real shame the blower unit doesnt really push that much air, even on max ac, but if you have extra cold ac the flow volume doesnt need to be that great. I think its probably a combination fact that the inlet through the evaporator housing is a bit torturous/convoluted

anyway I will have to de gas and regas my c900 because I neglected to insulate the expansion valve temperature bulb when I installed it hah which is fine, because I was always going to use the first charge to be sure that there were no leaks etc etc.
 

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Discussion Starter #24
not really!

dont use a ****ty venturi vacuum pump, doesnt pull enough vacuum unless your compressor is huge, buy a cheap rotary vane pump to pull a vacuum

you really need 29.5" of mercury to bring the boiling point of water down lower than ambient temperature to get your system really dry. teh drier it is, the best it will perform...

I bought a venturi pump and it can only pull 20-25" of mercury which is just not enough to get it completely dry.
 

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I'm installing A/C in my 1992 900i. It does not work, the clutch on the compressor screams after a few seconds, because the compressor "stalls", ie. almost seizes. If I shut the engine off and quickly try to turn the compressor by hand, it is very hard to move it - but not impossible.

I think perhaps my local SAAB specialist was mistaken when he said:

"You don't need to add compressor oil before installation - the oil added to the refridgerant is enough"

Is this correct??

My compressor is the same as the one described here (Seiko Seiki ss-170pss I think). I found it as NOS in Sweden.

I could really use a hint here...

Regards,

Peter Hansen

Copenhagen, Denmark.
 

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Discussion Starter #26 (Edited)
Hi there.

Stalling compressor may be obstruction in the system or massively overcharged with oil or refrigerant.

Anyone folks to anyone interested the seiko seiki 170 uses two different seal styles.

The first is a carbon seal which is still available.

Second is a rotary shaft seal with twin lips which is updated design

Both can be put in any seiko seiki 170.

I am using a brand new carbon seal as the used one I refaced and installed new o rings didn't last.

If this carbon seal doesn't last I will install the newer dynamic rotary shaft seal.

Part numbers mt2106 = carbon seal
Mt2078 = gasket kit
Mt 2279 = updated shaft seal.

Www.virtual-ac.com sells all 3 items cheaply that's where I got my stuff from. Good quality too.

The other thing I wanted to mention was if you buy a cheap vacuum pump and it doesn't pull good vacuum replace the shaft seal. I was having trouble getting past 15" and went and bought a new quality shaft seal and now it pulls down to 95%+ of absolute vacuum in about 5 seconds capped off. I'm at 400m elevation so that's about 28.5"hg and the pump pulls to 28".
 

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Discussion Starter #27




 

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Sorry to revive an old post, but a question for the OP: where did you source your new compressor clutch kit from? Mine is shot but I'm having trouble finding a replacement. Any help would be much appreciated.
 
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