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Testing vacuum pump on 85-89 cruise control ? 200 1988

posted by  B.C. on  Sat Jun 25 16:09 CST 2005
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last visit: Wed Mar 28 22:28 CST 2012
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As Rob said, there is no vacuum pump in the system. I installed a Volvo cruise control into my 1988 244 two years ago, works fine. I had the Volvo installation instructions for the job, without which I would have been DItW.

Vacuum is supplied from the intake manifold to two units mounted on the firewall in the engine bay. The unit from which a long hose goes into the cabin is the servo, the other is a vacuum reservoir. I installed no check valve in the vacuum supply line; it went to an additonal brass nipple I installed in a previously plugged hole in the I-manifold.

Are you perhaps considering one of those units to be a vacuum pump?

The instructions do not explain what part does what function. By following the vacuum diagram and wiring connections one can get some idea of what does what.

I know that some portion of the control unit gets its ground through the brake lights, so that closing the brake light switch drops the ground and CC shuts off. The vacuum switch on the brake (and clutch, if equipped) is another route to dropping out of cruise control quickly when circumstances seem to warrant that.

The control unit, when installed per instructins, is sort of flat, above the steering column and clamped to it. I can't imagine that another orientation would make any difference.

Hope this is helpful. Are you installing, troubleshooting?

Good Luck,

Bob

:>)





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