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Another problem

AC Amiture on Tue June 03, 2008 3:37 PM User is offline

Year: 2000
Make: Mitsubishi
Model: Mirage
Engine Size: 1.8?Smal
Refrigerant Type: R-134
Ambient Temp: 100

Well I mentioned this in my other post (re my S-10).

My daughter called to say that her AC is not working so I went to look at it last evening.

This system was just rebuilt 4 or 5 months ago using AC Kits parts and lots of good advice from this board.

What I was able to observe:

Turning on the AC resulted in a hesitant start up. That is to say, that the compressor would turn and stop once or twice then, finally,begin to turn.

Almost like a slipping clutch or belt.

Belt tension seems OK at a cursory check. Also no squealing.

No noises from compressor.

When running, the sight glass in the top of the drier has a white "milky" appearance. Perhaps "frothy" is the correct word.

Don't think this is normal.

If it has lost charge could this account for the clutch (pressure switch cutting in and out?)

I will look more closely this weekend when I have time and equipment.

In the meantime any suggestions?

AC Amiture on Wed June 04, 2008 3:38 PM User is offline

No suggestions at all???

Chick on Wed June 04, 2008 7:22 PM User is offlineView users profile

You will need to know that it is fully charged, since it's a new system, there may have been a loose fitting, or crushed O ring etc..causing a small leak.. Have it charged to specs, then see if the problem goes away. I would check the clutch gap while you're at it. Sometimes frequent cycling will cause premature wear on the surfaces widening the gap..Let us know how you make out..

Email: Chick


Freedoms just another word for nothing left to lose

AC Amiture on Sun June 08, 2008 3:15 PM User is offline

OK! Here is what has gone on so far. The system charge was close to gone. Found both valve cores leaking badly they would not seal at all. After removing them I found that the rubber seal at the end of the valve stem (the part that moves up and down under spring pressure.) was completely gone on both Schroeder valves. This is very strange since these were just replaced with new cores about 3 months ago. I replaced them with the two spares I had on hand. After evacuation and recharge the system seems to function OK now. I was unable to locate any other leaks.

I am worried about this happening again. What would cause the sealing rubber on these valves to completely disappear? The cores for this Mitsubishi are an unusual size and I had a hard time locating them. The ones I have now are from a shop in Scottsdale that had them (At least, they looked the same.) Could it be, that even though they fit they are a wrong type, with a type of rubber that is incompatible with R134A?

I'm stumped and I don't want this to happen again.

Does any one ave any answers or theories?????

mk378 on Sun June 08, 2008 3:40 PM User is offline

Sure they weren't tire valves instead? The standard shrader valve is exactly the same as a tire valve, but with different rubber.

The plastic caps should hold the charge in even if the valves are leaky. You need the caps on, with their rubber gaskets, because even "good" valves sometimes leak some.

AC Amiture on Sun June 08, 2008 4:42 PM User is offline

Caps were on and tight. They were supposed to be AC valve cores they looked the same as the ones I got from AC Kits for this car. I think they are the JRA High Flow cores. I don't believe that a tire valve core will even fit. It's weird. The rubber is just gone.

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