A/C Issues - PeachParts Mercedes-Benz Forum

reverendxlt · #1 07-07-2007, 12:57 AM

Got an A/C question...

I pulled the CCU, found two burnt traces. I soldered a jumper wire to reconnect the contact points. No cigar, nada, nothing, just like before.

I don't have anything, no defrost, no blower kicking on nothing.

I believe the next thing I should check is the Klima relay, I printed off a posting showing what pins do what, however, I have no idea where the klima relay is on my 1985 300TD

Anyone able to help me out?

Thanks,

Reverendxlt

Jeremy5848 · #2 07-07-2007, 01:58 AM

Here it is, next to the brake booster. If it fails, the compressor clutch won't be activated.

Jeremy

reverendxlt · #3 07-07-2007, 10:10 AM

Thanks for the help, I appreciate it

reverendxlt · #4 10-29-2007, 07:04 PM

ok, came back to this after a couple other issues have been resolved...

I can't get anything at all from my A/C, and I am seriously in need of defrost, if not heat here in San Antonio, TX.

If I'm not getting anything at all is this most likely the ccu?

RUN-EM · #5 10-29-2007, 09:54 PM

If your td is like the 300sd, air and heater reads the tach signal to some extent to operate properly. Also, make sure fuses to air/heater are in good shape. My 300SD makes a round imprint on the end of the fuse. I have to burnish the fuse holder in the box with super-fine sandpaper and install a new fuse with a little dielectric grease, and all is fine for a couple of years.
Then if that does not help, start a search on the monovalve -- in the heater system.
Check and replace that little booger if needed.

Regards

Run-Em