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#1
07-22-2012, 08:12 PM
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Starting to test my partially functional A/C system
Hello,
I have a 1985 300D KaliKar that has what I would call a marginal A/C system. On a cooler day (< 80), if the A/C is turned on you can just tell that drying and a small amount of cooling of the air from the vents are happening. On my car, with the engine cold, when you start the car and turn the A/C to full, the aux fan does not come on. Is the aux fan supposed to come on whenever the A/C system is on? This system is still R12.
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Mike Frederick 1986 300SDL, 240K+ miles 1985 300D KaliKar, 270K+ miles 
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#2
07-22-2012, 10:15 PM
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No. It'll only engage when temperature rises above setpoint. If you are low on refrigerant it wont build heat.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
07-23-2012, 06:57 PM
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Yes what he said about the fan.
On the dryer there are two switches, one is a pressure switch that sits in the refrigerant line. Normally this switch has spade connections directly on the back of the switch. The temperature switch is threaded into the casting on top of the dryer and usually has 2 wire leads going to inline spade connectors. If you unplug the switch from the harness and short the harness side connectors together with a small piece of wire (be careful, this is a hot-side switch so don't let your jumper touch the frame, or ground the connections, or you will blow a fuse) the aux fan should start.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech
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