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#1
10-09-2013, 04:41 PM
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1989 300 SE / AC Relay trouble
Dear friends,
I recently had work done on the above car, ac compressor, ac hoses, driver window motor. When picking car up, Gas pump relay did not work & replaced. Immediately after, AC relay did not work & shop has not been able to identify the trouble. AC works when you do a direct bridge without relay, so trouble is related to signal from relay somehow. Any suggestions ? Any suggestions for a knowledgeable & reasonable older benz models mechanic in Miami Dade County ? Thanks very much. Jorge 
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#2
10-10-2013, 11:49 AM
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Check the fuses for power to that relay.
There should be an A/C compressor speed sensor which is connected from the compressor to the A/C relay - be sure that is connected. Then check engine coolant temperature sensors to be sure they are connected, one of those is an input to the A/C relay. (If engine is too hot, the A/C will shut off.) And there should be an engine RPM input to the A/C relay - that would tell the relay that the engine RPMs are fast enough to turn on the A/C compressor. I got the above from here... http://www.startekinfo.com/StarTek/outside/12253/program/ETM/ACCfrom86.pdf
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Linear Mode
