while driving my 1980 300 SD with the climate control system on I reached up and pushed the "off" button and right then I heard a muffled "pop" noise sounded like from between the front seats under the car, then when I got home and tried to lock the car the doors locks wouldn't operate and key wouldn't turn

It sounds as if you blew a fuse. I can't believe it was that loud though. I think this will have to be looked at by a tech.

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Benzmac:
It sounds as if you blew a fuse. I can't believe it was that loud though. I think this will have to be looked at by a tech.

<HR></BLOCKQUOTE>
I found the problem....I only recently purchased this vehicle and am still trying to get used to the keys/locks....I had been pushing the key into the lock too far and it wasn't keying properly....as for the noise, it must have been something else....the locks work fine.....