donberry

Troubleshooting Cruise control. Could someone tell me where this connection goes. In the service manual pic, it would be #10. Where does this go to ? As you can see in the pic of mine, hoses have deterioted and need replaced. I just can not figure out where 10 actually goes to.

(actually it would be #6 as 10 is just the rubber grommet)

donberry

pic1

donberry

pic 2

donberry

the numbers did not show up on the 1st image. It is the rubber grommet on the bottom of the page attached to the line

donberry

awwww, c'mon. Someone surely knows what this is attached to. It would be so nice to have the cruise working

WallyP

The cruise control must be able to disengage instantly, as a safety measure. The lines that you are looking at are the vent lines - they don't connect to anything. They allow the servo to dump the vacuum instantly.

If the cruise control doesn't work, the first thing to try is to find the rubber cross connection near the vacuum brake booster. One line runs from the check valve on the brake booster to a small black/blue check valve, and from there to the rubber cross. From the cross, one line runs to the firewall - this is the main vacuum feed for the HVAC system. Another line runs to the front fender - this is the line to the vacuum reservoir and the cruise control servo (tempostat). The fourth line is a vacuum test port, and should be plugged.

Disconnect the vacuum line betweent he black/blue check valve and the rubber cross. Crank the engine, and make sure that there is a strong, steady vacuum on the line.

Disconnect the line going to the firewall, and plug that leg of the cross. If the cruise control now works, you have leaking vacuum servos in the HVAC system under the dash.

If the cruise control doesn't work when hooked directly to the vacuum source, the problem is more likely to be electrical than vacuum.

donberry

Thanks for the info.
Unfortunately, I am the kind of guy who will screw it up 3 times trying to fix it myself when it would have been cheaper to have someone else fix it to begin with. BUT, in the end, I just like to know how the things I own work.

What threw me off in the diagram was the rubber grommet, I figured it must have been attached to something.

Thanks again

syoo8

I'm going to tackle this tomorrow morning and I annotated the picture in the WSM for convenience-- thought someone might find this helpful.

(Sorry to bring up an old thread...)

WallyP

Very nice! Thank you.

Landseer

Nice diagram. Good idea.