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Originally Posted by flyboy
1982 300sd, trying to locate the compressor control relay.
woke up this morning and it no longer worked. was fine the night before. the clutch is not engaging. anyone have some input.
thank you flyboy
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Jump the low pressure switch connectors on the receiver / dryer with the ignition on and the engine off. If clutch engages then your low on pressure (most likely) or you have a bad switch (very unlikely). That is the easiest first trouble shooting test.