A/C R134a pressures too high. I'm lost. Ideas? - Page 6 - PeachParts Mercedes-Benz Forum

gabzor · #76 07-28-2012, 12:26 PM

wow great job, and yup that chirp is def your blower.. thanks for the great guide like always too

Air&Road · #77 07-30-2012, 07:39 AM

Quote:

Originally Posted by JamesDean

Does the 10P17C bolt up in place of the 10P15C? I think my 190 might eventually be in need of a replacement whenever I get to re-doing the a/c. I currently dont have much in the way of at idle a/c. When the compressor is above 1500-2000 I have wonderful cooling.

That might be just a charge issue but I'm not sure. It took a bit of refrigerant to get the system to have 165Psi high side when I added stuff a few weeks ago.

No, the bolt holes on the 17 are farther apart fore/aft requiring a different mount on the engine.

Air&Road · #78 07-30-2012, 07:42 AM

Quote:

Originally Posted by jcyuhn

I think the 17 compressor buys you better cooling at idle because the low side pressure doesn't rise so much. But there is no benefit once moving, at road RPM the 15 provides all the refrigerant the evap can handle. The 17 would be nicer, but I personally would not invest the time or money for that degree of improvement.

That makes total sense. I know in the refrigeration world the capacity of the system is largely determined by condensor capacity with the assumption that the compressor is of adequate size. That thinking, however, is from the stationary world where motors drive compressors at constant speed.

If someone were doing lots of stop & go driving in Phoenix, or Dallas for that matter, the larger compressor might very well bring something to the party.

I wonder how hard it would be to find the compressor mount in the boneyard?

JamesDean · #79 07-31-2012, 11:16 AM

Quote:

Originally Posted by Air&Road

That makes total sense. I know in the refrigeration world the capacity of the system is largely determined by condensor capacity with the assumption that the compressor is of adequate size. That thinking, however, is from the stationary world where motors drive compressors at constant speed.

If someone were doing lots of stop & go driving in Phoenix, or Dallas for that matter, the larger compressor might very well bring something to the party.

I wonder how hard it would be to find the compressor mount in the boneyard?

I wonder if you could use the mount from a M116/7 engine or something that was equipped with the 17.. I wonder if that would mount up to the other motors...

Air&Road · #80 07-31-2012, 02:21 PM

It's possible, but I wouldn't count on it.

The mount is designed to fit the engine on one side and the compressor on the other. I would THINK that the 92 & up have the 17, thus the mount would work okay. This is something that you'll just have to comb the boneyards for. Measure the bolt hole spacing fore and aft on the two compressors so that you know what you're looking for.

Hope this helps.

JamesDean · #81 07-31-2012, 03:09 PM

Hmmmm, My 190E is/was a 1993..but the engine from a 1990 300SEL was swapped into it... I *Think* the accessories were swapped over... I dont know if its a 15 or 17. I think I actually have another compressor somewhere too 15 or 17 cant recall exactly.