Hello all,

I have a couple of frustrating issues with my 300D lately. The cruise is still surging at random on the highway and my A/C cuts out at random as well. The cruise seems to work fine most of the time and has a subtle surge at other times. I have a rebuilt programa amp in the car from Fastlane and also have a new cruise switch on the steering column. Would the actuator cause this behavior and would lubing the linkage help at all? (It looks like a PITA job, however.) I have a spare motor and could swap actuators but I cannot seem to convince myself this is the problem.

The A/C is also very annoying and I can't decide if it's a bad KLIMA relay or simply a clutch gap that is out of adjustment. Any thoughts from the "experts"?

Thanks!

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1960 MB 190Db w/ full sunroof
1985 Toyota Pickup
2006 Honda Odyssey EXL R&N
2001 VW Jetta GLS TDI

The subtle surge on the Cruise tends to be due to speedo cable binding, causing fluctuations in needle indication along with CC amp input variations, and resulting CCAmp output variations.
Replace the Speedo cable. Unless you have the electronic speedo, in which case forget what I just said.

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Tony from West Oz.
Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine.
Josephine '82 300D 390kkm White/Palamino int.
Elizabeth '81 280E, sporting a '79 300D engine.
Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior


Various parts cars including 280E, 230C & 300D in various states of disassembly.

Need more info on the a/c. Have you taken vent temp measurement? Are you getting lots of condensation drain water? Is the sight glass clear? Is the sample blower running and drawing smoke through the grille at the rear view mirror?

Good luck,

Cruise surge can be fixed by lubing the throttle linkage with ATF and in some wierd cases a slight ALDA adjustment is necessary. Unless it surges wildly - like spiking from 70 to 90 MPH, its unlikely any of the $$$ parts of the system.

Regards,

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Brian Toscano

Only experience I've had with A/C cutting out was ultimately caused by a failing OVP relay behind the battery but like Larry says more information is needed before coming to any conclusions.

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Brian Toscano

QUOTE]Need more info on the a/c. Have you taken vent temp measurement? Are you getting lots of condensation drain water? Is the sight glass clear? Is the sample blower running and drawing smoke through the grille at the rear view mirror?[/QUOTE]

I have not taken vent temp measurements yet, but the air is very cold when it it running and the compressor cycles properly while in operation. It also runs the fan properly and all seems fine until it decides to "cut out". I haven't noticed any "extra" condensation drain water, but the manifold hose in the engine conmpartment always has lots of condensation around the fittings. Also, I will have to check the sight glass.... the sample blower is definitely running and drawing in smoke...

thanks for the replies.. any more thoughts?

Should I replace the relay?

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1960 MB 190Db w/ full sunroof
1985 Toyota Pickup
2006 Honda Odyssey EXL R&N
2001 VW Jetta GLS TDI

Okay, with that information it does indeed sound like you have a problem with power getting to the system. This could be ignition switch or bad ground somewhere.

The ignition switch is a somewhat common cause of this in a 123 car but I don't know about a 124.

Sorry I can't offer any more suggestions.

Good luck,