I'm trying to find out if or where compressor parts ar available for the my converted a/c compressor. It is a "dennso" compressor and I'm not exactly sure what the part that is bad is called. I believe it is probably the thermostat.It plugs into the back of the compressor and has a 3 wire lead that runs into the wire connector where you plug the compressor in.

I know that sounds a little ruff, but I don't know ho to explain it much better. Hopefully someone with a little more knowledge will know what it is I'm refering to.
Thanks
Shawn

That's the speed senosor.

Nippondenso AC compressors were used in lots of Japanese cars, so finding one in the junkyard won't be too difficult.

Bad thing is that the only way the speed sensor can get "worn" so it makes noise is for the main shaft of the compressor to move back in the bearings. The speed sensor is a Hall Effect pickup, shouldn't actually touch anything.

Check for grey or black residue in the AC components. If you find any, you will need to very carefully flush EVERYTHING and install a new or properly rebuilt AC compressor WITH an inline filter on the suction side.

I've been advised to avoid any Nippondenso AC compressors rebuilt by Four Seasons, they almost always fail and the warrenty won't be honored due to "contamination". I've heard this is because there is junk in them when delivered, but I don't know this for a fact, having never taken one apart. You really want to get one rebuilt in Japan. Those are very good.

A good used one from the junkyard will work, too.

You have either a 10P15C or 10PA15C compressor, I believe. Both have four sections. ON the 10P15C, the center two sections are equal length, on the 10PA15C the two center sections are unequal length.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

am I going to find it easier to just replace the compressor or can I find this speed sensor very easly? The speed sensor your refering to, dose it have a magnet inside it? I haven't taken the compressor off yet but from what I can tell it looks to have a magnet inside it then surounded by some kind of porclin like materal.
I can't tell how far it goes inside the compressor, being that it is broke off. You mentioned that the speed sensor shouldn't actually touch anything so if it's broke off, like mine is then the main shaft has moved back in the bearings until it has hit the speed sensor?
The compressor wasn't making a whole lot of noise, I thought it was a little worse than nornal, but at low rpm's it was barley noticable.

Is your system currently charged?

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

Recently I rebuild the compressor,maybe I can offer some information. The speed sensor is not use by every Nippondenso compressor. I should say it is specified by mercedes. My porshe's "denso" doesn't have it at all. I try to say is if you are getting the compressor from junk yard make sure they have the "tail" you needed. The speed sensor is attached to a plate and hold to compressor by a circlip, inside the plate is O-ring to seal. Like psfred said there is some space there, no shaft. I don't think the shaft can move backward. What will it happen to the clutch and magnetic coil if it moves backward?

If you're satisfied that only the "ceramic encased magnet with electrical connection" (which is a good description of a speed sensor) is bad and that the compressor rotates normally and has not had any problems except this, I'd replace the speed sensor and give it a try. If you call either of these two places for the part as they have proven very helpful to me in the past.

http://www.ackits.com/

http://www.acsource.com/

I know that you're not planning a full reseal, but this is worth reading also:

http://www.pelicanparts.com/techarticles/911_Nippondenso_rebuild/911_Nippondenso_rebuild.htm

__________________
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)

Ok, I think that I can get away with just replacing the speed sensor, but now I'm coming across another problem. My local mercedes dealer is telling me that the speed sensor is listed as a R12 part only. Being that my system is converted to 134a, is this going to be a problem or is there a sensor that is for 134a?