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What is this? On bottom of compressor?

ACnoob on Thu September 23, 2010 2:04 PM User is offline

So long story short, cracked a line, replaced, refilled (I think it was overfilled though) few days later driving down the road hear hissing noise and refrigerant comes out form under my hood, all of it in about 3 minutes. Got home, couldn't see exactly where it came from but best guess is this thing that is on the bottom of the compressor. Evaced the lines and refilled and there is no obvious leak like there was before.

Picture if from another compressor, it has like a plexiglass window on the bottom, the one in my compressor is cracked though. It apears to be some sort of regulating valve, its a spring loaded piston type thing looks like oil might go through the top and come out in the middle when pressure is high enough?

I'm trying to figure out if this thing being cracked at the end (where the plexiglass is) could have been the cause of the leak. I've dyed the system in the meantime.

Also need to know what it is so if it is broken I can try and get a new one, doesn't look like I can buy it separate through usual sources.


robs on Thu September 23, 2010 2:44 PM User is offlineView users profile

It looks like a control valve, we have them listed HERE. They vary by color.

ACnoob on Thu September 23, 2010 8:18 PM User is offline

Thanks, none of them look to be the same, this is out of a denso compressor.

What exactly is the function of this? I refilled the AC and nothing's leaking/no dye showing :/ doesn't make sense to go from a massive leak to nothing.

NickD on Fri September 24, 2010 12:16 PM User is offline

Guesses could be restricted by listing the make, year, model, and engine, this compressor came out of. Also having some kind of ruler in the photo so one could judge the size of it.

In the last 25 years, the proliferation of automotive components has grown at an astronomical/exponential rate. What hasn't grown is the number of brain cells nature has bestowed upon us. Was going through my drawer of special purpose one time tools I have purchased, without even the slightest recollection of why I even purchased them. But can't argue they are there and I needed them at the time.

I don't know, looks like some obsolete pressure relieve valve that is no longer legal for use, but just a wild guess.

iceman2555 on Fri September 24, 2010 12:18 PM User is offlineView users profile

If this is in a Denso (6C17) variable compressor, there is only one source that I know of that services this valve. Santech Industries has the valve available as part number: Main valve is MT2251, Sub control valve can be disassembled and cleaned. If this is a late model 7SBU series, let us know, we may have a location for that valve also.

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ACnoob on Fri September 24, 2010 5:07 PM User is offline

Quote
Originally posted by: iceman2555
If this is in a Denso (6C17) variable compressor, there is only one source that I know of that services this valve. Santech Industries has the valve available as part number: Main valve is MT2251, Sub control valve can be disassembled and cleaned. If this is a late model 7SBU series, let us know, we may have a location for that valve also.

It's an 7sbu16c, what exactly does the valve do though? I ask because If I can get an idea of what it does I could figure out if it's a possible cause. As of right now nothing has been leaking, so I'm trying to figure out if it could sort of be two stages and open further under higher pressure or something proliferating a leak only at that time.

TRB on Fri September 24, 2010 5:33 PM User is offlineView users profile

Simple explanation: It regulates refrigerant flow versa compressor RPM.

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ACnoob on Fri September 24, 2010 6:03 PM User is offline

So at higher rpms as pressure goes up it opens and routes refrigerant back to the suction side?

NickD on Sat September 25, 2010 5:16 AM User is offline

They are calling the 7SBU16C a variable displacement compressor and this is the control valve for it.



Just posted this photo because if I opened a compressor, expect to see some corrosion on the outside, but the inside has to be clean. Looks like your valve was way overheated at one time with all the burnt oil on it that makes me wonder what the rest of the system looks like. Maybe time to be looking at a new compressor. What does the clutch look like?

ACnoob on Sat September 25, 2010 6:40 PM User is offline

Quote
Originally posted by: NickD
They are calling the 7SBU16C a variable displacement compressor and this is the control valve for it.







Just posted this photo because if I opened a compressor, expect to see some corrosion on the outside, but the inside has to be clean. Looks like your valve was way overheated at one time with all the burnt oil on it that makes me wonder what the rest of the system looks like. Maybe time to be looking at a new compressor. What does the clutch look like?

Couldn't tell you what the clutch looks like, I have not delved that deep into compressors. I do think it was overfilled for a few days though prior to venting.

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