1985 Mercedes 300D, rattling climate control unit

[jdere31760]

Hello everyone, Hope everyone is staying safe!
I have a 300D with a climate control unit that rattles when the car is cold.
It's definitely the 4 or more relays towards the back of the unit.
It's so loud and annoying, I have to disconnect the left side terminal plug.
I also noticed the rattle changes in intensity when I step on the accelerator.
Thanks for any help.

[carock]

Look at online videos about how to remove the climate control unit. Five minute job once you know how to do it. Then poke around and let us know what you find. I am pretty sure whatever is rattling around is not an actual car part, but some foreign object that fell into the area.

[jdere31760]

Definitely not a foreign object. Sounds like relays chattering. Happens only during car warm up then goes away.