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#1
10-27-2003, 09:23 AM
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1988 300SE Air Condicioner
Compressor does not engage. Recommended check high - low sensor (switch? ) could not locate. Where and what do I look for and how do I check? Anything else I may check. Switches on 5 panel seem to engage properly, air flow changes to correct ports. Heater works. Thanks Brian
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#2
10-27-2003, 10:33 AM
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Is the A/C fully charged? No freon, compressor does nto engange.
__________________
Insanity: doing the same thing over and over again and expecting different results. 2006 - Suzuki Gran Vitara (2.0 L fully equipped) Like this car so far except for trying to put on the seatbelt. 1988 - 190e - 2.3L - 172K miles (It now belongs to the exwife) 1999 - Chevy Blazer LS Fully Equiped - killed it June 2006 2001 - Honda Civic EX - 68K miles (sold June 2004) 1963 - 220S - Dual Carb 6 cyl. (sold) 1994 - Yamaha WaveRaider (fun to ride)
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#3
10-28-2003, 02:11 AM
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There are two pressure switches on the receiver drier behind the left headlight. One breaks the power to the compressor clutch when the pressure is too low, one sends power to the auxiliary fan circuit when the pressure is 'high enough.'
There's also the 105/115C switch on the head near the #4-#5 intake manifold runners. It's a 2-pin temp sensor. At 105C the auxiliary fans come on full tilt, at 115C the compressor is disengaged. Sixto 95 S420 91 300SE 87 300SDL 83 300SD Last edited by sixto; 10-28-2003 at 09:46 PM.
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#4
10-28-2003, 09:54 PM
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Brian,
Sorry about the emails I sent that had nothing to do with the compressor  The wiring diagram I have is terrible but a simple test is to pull the connector off the switch. If the compressor engages, the swtich is bad. You should also test the swtich on the drier with the blue/red wire. Jump the ends and see if that gets the compressor going. If so, the pressure switch is bad. I think you have to evacuate the system to replace the switch. Other suspects are the cabin temp sensor, evaporator temp sensor, temp controller, pushbutton unit and the Klima relay. Diagnosis of these items is not so simple. Have you tried with the temp wheel set to min - to the click? Have you tried in defrost mode? Are you sure you have a proper refrigerant charge? Sixto 95 S420 91 300SE 87 300SDL 83 300SD
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Linear Mode
