Well, the A/C problem is that it does not come on instantly. Sometimes, it comes on instantly after I press the compressor button, or turn the car on if I left the switch on, other times, it takes about 1 or 2 minutes for the A/C to engage, sometimes, I will have to wait 5 or 7 minutes for it to engage. Why does it take so long for the A/C to engage? I just got it recharged last wednesday, and I took a look behind the glove compartment today, and the vacuum actuator moved and I heard hissing and stuff, but the air did not come on for a while.
-Joe

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

bump, because this is very annoying

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

my last bump, after this, I'll seek help for this problem elsewhere if someone doesn't have a clue here

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

Is the delay for the compressor only, or the blower fan, or both?

I believe its the blower fan only, because I think I can "feel" the compressor working when I press the button. I'll check later on the ride home today.
-Joe

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

Try hitting the "defrost" button on the far left of the climate control unit. Defrost automatically selects the highest on the seven possible fan speeds. Sometimes this will get the fan running, then you can select another mode. If this works, it could indicate a bad (poor, but not broken) connection in the CCU. The blower control relay is another possible cause. Could be the fan motor. Check for voltage at the fan motor connector when the fan should be "on" but is not. Sometimes the fuse contacts get corroded and cause this type of problem. How many miles on the car?

I have noticed whever I hit this bump on this bridge on the way home from school, or church, the a/c will come on. I will have to always go over this bridge in order to get home, no matter if I take different side streets to get to the bridge, resulting in different arrival times, if I drive over the bridge, the air will come on, so I suspect something might be loose or whatnot. Also, I noticed when I change the temp from MIN to any other setting, the air will stop coming from the center vents and start coming out of the defrost vents unless I turn the temp to MIN only. What's behind that?
-Joe

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

The CCU closes off the center vents when it thinks that it is in the heater mode. Only cold air should blow from the center vents. From your latest comments, my bet is a bad connection in the CCU. Some forum members have reported that resoldering some of the connections between circuit boards in the push button unit has solved this type of problem.

If the blower works when you hit the bump, it's the brushes. If it changes modes, there are bad solder connections in the pushbutton unit OR you have loose connectors on the pushbutton unit or on the temp sensors.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

I had the same symptoms, but it was not the brushes. The blower motor was not getting power. The problem was in the CCU. It could be the brushes. That's why I previously suggested checking for power at the motor.