11-04-2003, 08:08 PM
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Banned
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Join Date: Sep 2003
Location: New Jersey
Posts: 1,561
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Quote:
Originally posted by Rick Miley
Ok, here's some more stuff specific to the 240D.
First, the check valve is in the engine bay near the oil filter and has three lines on it. The side with the single port shoud go to the vacuum souce (the pump at the front of the engine). The side with two ports shoud go to two yellow lines that go through the firewall.
The check valve should allow air to pass from the two port side to the single port side. (The vacuum pump is sucking on it) It should also allow air to pass freely betwen the two ports that are on the same side. And it should NOT allow air to pass from the single port side to either of the ports on the two port side. To test that, plug one of the ports, put the MityVac on the other and pump it down. It should hold vacuum. Do NOT plug the single port side for this test - it should hold on its own.
Next, use the MityVac to pump down the yellow line with the gray stripe. This line runs through the cabin along the floor on the passenger's side to the vacuum reservior in the trunk under the package shelf. There are no breaks or branches in that line. It will take several pumps to develop vacuum in the reservoir because it holds a lot of air. But it should develop and then hold vacuum indefinitely.
Next, test the solid yellow line. It runs from the firewall to the lock actuater valve in the drivers door to supply vacuum for the rest of the locks. To test this line separately, remove the driver's door panel, remove the solid yellow line from the valve, and plug the end. Then pump down from the engine bay end with the MityVac. (This line was one of the problems in my car)
Next, test the rest of the vacuum lines. The vacuum runs through two sets of lines starting at the driver's door, and running to the other three doors, plus the fuel filler and the trunk. The yellow lines with the red stripe provide vacuum to lock. The ones with green stripes provide vacuum to unlock.
The routing is as follows: The lines run from the driver's door to a branch in the plastic channel under the carpet in the driver's footwell. From there, the lines going to the rear are for the rear driver's side door and nothing else. The lines running along the front edge of the seats supply everything else.
There is another branch in a similar location on the passenger's side floor. The red and green striped lines running forward supply the passenger's door and nothing else.
One set of lines running rearward is for the rear passenger's side door, and the other set is for the fuel filler and trunk.
The best thing to do is test each branch of the circuit with the MityVac to see if it will actuate and hold vacuum. Test both lock and unlock functions separately.
The fuel filler is different from the rest, as it only has the lock line connected to the vacuum pod. Unlocking is done by a spring. To access it you have to remove the plastic trunk liner panel.
The trunk lock vacuum pod is located behind a small access door near the lock in the trunk. The rubber diaphram on it is very thin, unlike the rest of the actuators, and looks easily torn or split. (This was another problem on my car)
Another possible vacuum problem, although not lock related, is the climate control system. That has at least two actuators that I know of under the dashboard near the console. Vacuum is supplied by the green line from the engine bay, through the compressor control knob, to the two pods. Yes, even the lowly 240D's "manual" system is partially dependent on vacuum. If there's a leak here, then it could cause all vacuum systems (locks and engine shutoff) to be weak.
You'll see that all the vacuum lines are joined by black rubber hoses. A great way to test the system is to plug the hoses with golf tees so you can pump down one branch at a time with the mityvac.
Good luck and happy hunting.
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This is awesome, and I think *VERY* worth bumping!
Thanks!
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