mAMG

Hi all,

Couple months ago I changed the AC compressor to the Denso one. The OEM one is also manfactured by Denso as I know.

So I thought at that time buying a new aftermarket Denso will be better than a used OEM one since both are identical.

However, summer here is really hot and temperature reach 45-50 Celsius degrees, and I think the AC is not working perfectly.

At night it is very cold, just in day it is cool but not cold. The Old OEM always dripping water under the car while now this doesn't ?


- Is it that the compressor is different than the OEM ?

- Could it be low R134 ?

- Is the star setting for hot countries does really effect the AC ?

Any advice will help a lot, thanks.

Elhonaz

take it somewhere where they can do a AC service. That will tell if it was low on R134, and if theres a leak in the system

Toadster

I had that issue, ended up being the low pressure hose needed replaced - I guess it's somewhat common because of the underhood heat - it breaks down that hose and it collapses at times

mAMG

Okay ill check with the dealer as soon as possible if there is any leaks.

However, if there is no leaks, does that mean that the aftermaket compressor - Denso - does not perform as the OEM one which is manfactured by denso as well ?

kponti

There is no leak when the low pressure hose breaks down, its an internal breakdown

Denroll

Someone posted a pic of the hose Toadster is talking about and part of the inside of the hose had collapsed. I was going to replace mine just to see if it helped with the weaksauce AC, but the dealer wants about $100 just for the hose.

I do think these systems are pretty finicky when it comes to the correct amount of R134. If you get a recharge kit, get the coolant without any dye or lubricant. Bonus: these cans are cheaper. I messed around with mine last year. I thought it might be high, so I had someone bleed it out some. We went too far and the AC barely worked. I put in some coolant and put it right in the middle of the recommended range and it did work a bit better than before we let any coolant out. Still, it won't have me turning down the fan because it's too cold like any other car made after 1980 is capable of doing. Maybe that hose does need replacing.

mAMG

I just saw Toadster topic about that hose so ill change the low pressure hose and dehydrator. I hope the problem won't be the aftermaket compressor being not as good as the performance of the OEM one

Thanks a lot for the help, Ill make another post once i change these parts.

carguyshu

I don't know of a scenario where the compressor brand has anything to do with the performance of the AC system, unless it was leaking. It is going to compress at the exact same rate using the same size piston.