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Old 07-09-2018, 01:33 AM
Join Date: Oct 2017
Location: Kentucky
Posts: 7
Exclamation 92 300DT air conditionion

I am the second owner of a 92 300DT. Beautiful car. This forum has been very helpful. Car has had gentle use, belonged to an elderly librarian at my old middle school. Car has had Dealership maintenance ( poor) since new. Oil changes etc every 5k miles since new. Ac compressor works, puts out nice cold air, but wont kick in and out by itself. Ran a jump wire to the battery to make sure it was functional. It just doesn't kick in on its own. Suggestions? Ideas? Solutions? Any help would be appreciated.
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Old 07-10-2018, 08:32 PM
bigpanda16's Avatar
Join Date: Aug 2012
Location: Atlanta, GA
Posts: 187
Tachometer working?
If not I'd suspect the cop realty.
Otherwise it could be a faulty pressure sensor or more
87 190Dt 717.411, 78 300Dt, 95 E300d, 94 E320 estate wagon
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Old 07-10-2018, 09:27 PM
Control Freak
Join Date: Oct 2011
Location: Columbia, SC
Posts: 3,196
Head on over to
and look at Chapter 83

Everything you need to know to troubleshoot the system is there.
2014 ML350 Bluetec (wife's DD)
2008 E320 Bluetec (my DD)
2008 ML320 CDI (Older son's college DD)
1998 E300DT (Younger son's college DD)
1987 300TD sold to vstech
gone but living on
1983 240D (body to greazzer, engine to t walgamuth)
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