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Old 04-13-2017, 11:34 AM   #1
Ursan
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Default 1994 940 cruise control issues

1994 940 cruise control. I can see the vacuum motor, it's got a hose running to the actuator, but there seems to be a nipple that has nothing on it but two hoses that come from the back of the pump. Are those outlet?

Issue is the cruise works only at highway speeds and only just. I'm not sure if the pump is working, barely working or if there's a leak.

I'm going to check all the connections and the switch on the brake and see if that needs another o-ring again.

Anything else I can try? Is there a way I can test the pump? How many inches should it be pulling?
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Old 04-16-2017, 01:38 AM   #2
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anyone?
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Old 04-16-2017, 02:13 AM   #3
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Can't shed much light but vacuum hoses would be first place to look, especially the elbows. I need to replace the elbow on mine because the inside bend has dry rotted badly. It doesn't look like it but when you flex it, there may be holes going clean through it.
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Old 04-16-2017, 02:35 AM   #4
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Also isolate the pull bellows and make sure it holds vacuum.

Codes/etc.?

https://www.volvoclub.org.uk/faq/CruiseControl.html
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Old 04-16-2017, 10:27 AM   #5
ZVOLV
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There is a vent nip with nothing on it, I think.

Full shakedown of cruise would be learning how to read the various electrical signals using a high end multimeter or a scope. I was hoping to try this on my inoperable 86 740 cruise, but haven't yet.
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Old 04-17-2017, 02:27 PM   #6
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I did check those last year. But I'll check again.
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Old 04-17-2017, 02:33 PM   #7
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Like everyone above said, vacuum leak. It is most likely at the brake pedal switch/valve. That port on the pump is supposed to be open, no line attached.
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Old 04-17-2017, 03:51 PM   #8
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I just checked the brake switch and replaced the o-ring there.
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Old 07-13-2017, 06:29 PM   #9
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Okay, so the bellows doesn't hold vacuum. Where can one get a replacement?

Last edited by Ursan; 07-14-2017 at 09:43 AM..
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Old 08-05-2018, 02:09 PM   #10
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Okay, so the bellows doesn't hold vacuum. Where can one get a replacement?
If there is a small pinhole in it, try a bicycle tire repair pad. Cheapest way to fix a leak on that one.
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Old 08-07-2018, 02:50 PM   #11
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Okay, so the bellows doesn't hold vacuum. Where can one get a replacement?
JY?
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Old 08-07-2018, 03:01 PM   #12
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https://www.tascaparts.com/oem-parts...m-unit-1273227
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Old 08-07-2018, 03:12 PM   #13
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^^ Ouch. At least they still offer the part. I'll part with a used one for much less.
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