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Mitsubishi FX-105 VS compressor in 93 Stealth with 134a

buickwagon on Wed August 08, 2012 8:45 AM User is offline

Year: 93
Make: Dodge
Model: Stealth
Engine Size: 3 litre
Refrigerant Type: R-134a conversi
Ambient Temp: 80
Pressure Low: 83
Pressure High: 90
Country of Origin: Japan

(The Stealth is a re-badged Mitsubishi 3000GT.)

Does this compressor have a serviceable or replaceable control mechanism?

System was converted from R-12. Currently filled with ester oil and 27 oz of R-134a. Mineral oil not flushed out, to aid in sealing hoses. Cooled well for about a week.

The charge is holding fine, compressor runs steady, sight glass is full with just the odd bubble passing by. Connecting the gauges, and unplugging/plugging the pressure switch the Low side drops all of 3 psi and the High side barely moves. Confirmed the gauges are working properly. Confirmed I have a positive connection to the system pressure.

The Factory Service Manual is pretty pathetic compared to most, but the diagnostic chart points to "compressor is locked in the full capacity control (delivery rate: 0) state." No explanation how it got this way or what to do about it beyond replacing the compressor.

In 94, they switched to R-134a. Almost all components are identical between the two years, except the compressor (and hose to the compressor, to suit the different connections) and high pressure limit.

If the compressor needs replacing, can we stay with the FX-105 VS unit? From what I can see on the parts diagrams, there are some differences in the mounting bosses, hose connections, thermostat and revolution sensors although the pulley size of the MSC 105 (used from 94- up) is the same.

I've saved hundreds on service by spending thousands on tools.

AutoCool on Sun August 12, 2012 6:09 AM User is offline

Parts catalogs show both carbon shaft seals and lip seals, since yours is a late model I would think that yours has a lip seal. Control valves are not available new as far as I can tell. All orings are available. That's a scroll compressor so not much can go wrong if it's quiet and not leaking. You're probably right, problem is the control valve. But it appears that the rebuilt units probably just reuse the same control valve.

That compressor is something of an oddball, used ONLY on Mitsubishi cars. I was told years ago that it's not worth rebuilding COMMON compressors yourself, let a factory do that, but go ahead and rebuild the odd ones yourself. Maybe the control valve is just full of muck. Pull it and take a look.

Dougflas on Mon August 13, 2012 7:42 AM User is offline

Did you try smacking it with a rubber mallet? If so, then use a larger mallet. Sometimes the valves stick and the compresser is left in the destroked position.

buickwagon on Tue August 14, 2012 9:58 PM User is offline

"If it doesn't work, hit it with a hammer. If it still doesn't work, hit it harder. If you break it, that's OK, 'cause you needed a new one anyway..."

Ok, I'll hit it with the mallet. If that doesn't work, I'll take it apart. Thanks for the tips.

I've saved hundreds on service by spending thousands on tools.

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