98 S500 NO COLD AIR, AC COMPRESSER WILL NOT TURN ON. FUSE IN MAIN BOX IS GOOD, WITH A SET OF GAUGES HOOKED UP AND PRESURE IN LINES AROUND 95 lbs THERE IS IS PLENTY OF R134 THERE
ANY THOUGHTS THAT MIGHT HELP?

Did you pull the fault codes?

Read the procedure here: http://www.eclassbenz.com/node/27

The site is for e-class cars but the procedure will be the same for your 98. Perform parts 1 & 2 then post your findings.

__________________
"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles

Thanks Bob,
This is all new to me,but willing, and do have some skills.
Hope I did this right.
Error codes read Eb1 227
EB1 23
E FF
Fault Codes
1. 72 6. -40
2. -40 7. 4
3. 110 8. 58
4. 111
5. 64

98 S500 106.000 Mi
Love my car.

Error Codes:

B1227 Outside temperature indicator temp sensor (014)

B123 (didn't get the last digit) could be:

B1230 Evaporator temperature sensor (B10/6)
B1231 ECT sensor (B11/4)
B1232 Refrigerant pressure sensor (B12)
B1233 Refrigerant temperature sensor (B12/1)
B1234 Sun sensor (B32)
B1235 Emissions sensor (B31)

E FF means no more error codes found.

Of those codes, I believe only 1232 or 1233 would be the only ones that would prevent the compressor from engaging. I'm definitely not an A/C expert, so I'm sure someone will correct me if I'm way off base.

For the real time data: (Assuming all temperature values are in deg F.)

#1 is inside temp: 72 (probably OK)
#2 is outside temp -40 (an improbable value. Sensor is bad. B1227 code above)
#3 is left heater core temp: 110 (OK)
#4 is right heater core temp: 111 (OK)
#5 is evaporator temp: 64 (probably OK if compressor is not running)
#6 is engine coolant temp: -40 (an improbable value)
#7 is refrigerant pressure in bars: 4 (probably OK if compressor is not running)
#8 is refrigerant temperature: 58 (probably OK)

__________________
"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles

Thanks for the help.
Any other thoughts as to why compressor does not turn on? I did check the compresor plug seems ok.


jlb

can you go read out all the digits of that eB123 code? That would help a lot.

__________________
"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles