The CC on my 84 300D turbo works sometimes but not always. It seems as if I turn it on at about 25 MPH or 40km it works well. However at higher speeds it will not cut in> Where is the first place to look?Has any one else experienced this? All replies greatly appreciated.

Thanks,
Harry

Not sure of how the exact system in your car. My 1996 E320 had issues with tire size, and as you say at low speeds it was fine.

Or I hear vaccuum leaks can cause issues ?

Most cruise issues are caused by the cruise amp. resoldering the connections will often set thins right for a while. A small percentage are caused by a bad actuator.

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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes

I read to re-solder just the capacitors. Two are round, the rest are rectangular. If that fails, re-solder again and then do the rest.

But there is a varnish over the board making it very hard to work on.

And to remove the board I read about bending the small metal tabs that bend towards the center. Once bent outwards the board will pull right down. Otherwise its a pain to remove the board and metal housing.

A search will bring many tips on how to repair it.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car

Thanks,

I am a novice so I need to know where the amp is located and how to pull it out.

Thanks again,
Harry

Its under the drivers side kick panel just to the left of the steering column. Look for a VHS tape (remember those?) size silver relay. Unplug it, then struggle for hours trying to get the ONE phillips head screw out to pull the amp. GOOD LUCK

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg

Thanks..but if its that hard ill probably leave it to my mechanic. Does anyone know the prox cost of a new amp? I may try it anyway.

Thanks,
Harry

New amp? A few hundred. Rebuilds I think run $200.

And no, you do not have to struggle for hours if you just bend the tabs back that hold it. I think four. Then it slides right down! Makes it REALLY easy to take out, solder and test.

__________________
1991 560 SEL / 185k miles
1992 750il / 17k miles - project car