mrlament

Hi everyone,

I have a 1999 c280. Out of the blue, all of my door locks and my trunk release have stopped working. I'm assuming this is the vacuum pump?

If so, can anyone tell me where it's located so I can replace it? I haven't been able to find the information online.

I have seen a few posts that suggested it might be in the trunk. If so, how would I access it, as without vacuum, I can't get the trunk to open (even with the key).

Thanks in advance.

Plutoe

Google-----PSE pump, mines under the rear passenger seat, make darn sure you have the correct part number for replacement!----if you don't know post your VIN!

mrlament

Thanks! It looks like mine is indeed in the truck, which brings me to the real dilemma:

How can I access it to replace it when I can't open the trunk without vacuum?

Plutoe

You must work the night shift, most trunks have a place to put a metal key---was your stolen??

mrlament

Thanks again for replying...

Well, I have the slim metal key that fits into the key fob... is that the one you mean? It fits into the trunk keyhole and will turn either way, but neither way actually opens it.

shadenfroh

Turn the key, hold it there, and then push in.

mrlament

Turns out the issue was with my trunk lock - it goes all the way to the left (and wont unlock), but if I just turn it a quarter turn to the left it unlocks, so I'm finally into the trunk!

Now to diagnose this vacuum pump...

Thanks for the help!