A/C and Heat Causes Engine to Lock Up - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 06-15-2005, 12:25 PM Thread Starter
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Date registered: Jun 2005
Vehicle: 1988 300TE
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A/C and Heat Causes Engine to Lock Up

First post, like the forum so far. I'd appreciate any opinions about this.

I've got an '88 300TE. Recently, I was out to lunch, A/C on as usual. Upon coming out from the restaurant, the car wouldn't start up. She'd start to crank, and get nowhere. Ran through the usual on-the-spot diagnostics, powered down everything: Radio, A/C, Overhead Dome Lights (To the always off position). She started right up, so I cycled back through everything. Upon turning the A/C on, the engine rev'd up to about 5000 RPM, dropped to zero, and oscillated like this a good three or four times before shutting down completely, every single warning light on the dash on as when first turning the key. Note also: The fan portion works fine, I can have it on "Economy" mode, but if the A/C or Heat is on (Yes, heat too), the RPM's oscillate a few times, and shuts down.

My first thought was that the compressor has failed, and is drawing an immense amount of current from the alternator, but after seeing the heat do the same thing, I'm at a loss for ideas.

Found out yesterday, when a friend clicked on the A/C on the highway, that whatever it is has the strength to bring the car to an almost dead halt from 80 MPH. I'm thanking my lucky stars it didn't take out the transmission.

Any ideas? Thanks!

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post #2 of 2 (permalink) Old 06-15-2005, 05:57 PM
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Date registered: Apr 2005
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RE: A/C and Heat Causes Engine to Lock Up

Can you easily remove the belt or let off the tension to see if compressor turns somewhat freely? I had a mini-van compressor lock up and it stalled the engine! Other than that, I don't know anything else to give you on this one.

As far as the compressor goes, you may not be able to tell unless you are watching under the hood while someone else turns on A/C. You can see if clutch locks up and stalls car.
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