PeachParts Mercedes-Benz Forum - View Single Post - W124 - replace automatic climate control with manual system?

jay_bob · #4 05-09-2013, 07:22 AM

I suspect you have no vacuum

Simple thing to check:
- Acquire a MityVac vacuum tester
- Remove your glove box lining
- behind the glove box near the center of the car is a vaccum manifold with one green line (the vacuum source from the engine) and seven hoses going out to the pods.
- Start the car, unplug the green hose from the manifold and see if it has vacuum if not track the problem back to the engine compartment. That hose runs behind the gauge cluster and out a grommet near the master cylinder. I had a plugged restrictor orifice at the vacuum pump splitter.
- If that checks out try applying vacuum to each of the 7 vac pod lines. See if the pods hold vacuum and the air flow changes.
- I have heard of the manifold going bad, it has 7 electric valves in it and there was a member who had a bad solder joint causing the valves to not work. Can be fixed, pull from a wreck, or I believe still available new but $$

The factory manuals for the 124 are online from M-B, chapter 82 has the AC trobuleshooting procedure.