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#1
05-08-2010, 06:17 PM
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'01 E430 A/C blows warm (readings inside)
A couple of weeks ago my A/C degraded from freezing cold to sorta cool to current warm air. My compressor engages (clutch and hub) and the pushbutton diagnostics showed I was a little lacking on the low side ... no error codes (except sun sensor) were pulled. Seemed like a classic low refrigerant issue. That is until I tried to pour a can of 134a in the system but there was too much pressure at the low port and it wouldn't take it.
Bought a manifold gauge to see what's really up and today with 85F ambient and engine rev'ed to 1500 rpm my pressures settled in at 95 low, 145 high. That's obviously a high low and a low high. Any experts have a general idea what's going on here? Sounds to me like there's either a restriction in the system or the compressor is almost shot although it has never made any unusual noises to indicate possible failure. I'm at a loss. Any help would be much appreciated! 
__________________
-Paul- '01 E430, Sport 72,000 mi '98 C280, 126,500 mi 
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#2
05-10-2010, 08:50 AM
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99% of the time...those readings are due to a bad compressor,
the other 1% are from a bad expansion valve.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
05-10-2010, 01:54 PM
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Thanks DOC for the reply.
 I figured it was the compressor but I'm not too disappointed because I'm one step closer to solving the problem. I've found a new Denso replacement for ~$300 which sounds very reasonable and the drier and expansion valve are cheap.I see some other "OE" compressors out there that looked tempting until I found out they're from China. 
__________________
-Paul- '01 E430, Sport 72,000 mi '98 C280, 126,500 mi
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#4
06-20-2010, 05:14 PM
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AC is back on! Installed a new Nipondenso compressor, receiver/drier and expansion valve, changed the V belt, flushed the evaporator, condenser and all the hoses, added PAG 46 DEC oil to meticulous specs, pulled a vacuum for a few hours (very hot and humid in Houston) and 3 cans of 134a later the system is blowing icicles.
 With 95F ambient here I'm getting 37F from the evap temp sensor! (seen it dip to 35 a few times while highway driving) What a relief....
__________________
-Paul- '01 E430, Sport 72,000 mi '98 C280, 126,500 mi
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