The search function is located at the mid-upper right of the screen. Sometimes it does take a while for some questions to get answered, not a slight though.

There is a difference between the 116 chasis and the 126 as far as the heater/climate control goes. The 126 has a monovalve (cheap/easy fix) while the 116 has an auxillary water pump and some leakage in that area can cause the control module to fry (or so I've read).

1978 puts it solidly as a W116. Try doing a search on the aux water pump, there may be some DIY fixes you can attempt (read: cheap and easy).

__________________
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.