What is the proper way to align the thermostat on a 76 300d w115?. The pictures in my manual are confusing. I now have it aligned with (arrow) pointed to the incoming coolant.

Somewhere along the 360* edge of the t-stat should be a small, probably brass, check valve with a ball bearing in it. That valve should be located at the 12 o'clock position when the t-stat is installed.

Many people pop off the check valve so there is just a small hole and no ball bearing to get stuck and not allow the system to vent. If you pop the valve off the hole should be at 12 o'clock.

__________________
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.

12 o'clock meaning pointing to the windshield? My t-stat is dropped in (horizontal) the pictures in my MB manual don't show my config. i don't think I have a euro model as the original owner was a doc in OK City, purchased from dealer. $14K in 1976, such a deal!


By the way, where is Temecula?

OK, clocking would normally apply to a vertically mounted t-stat. Horizontally mounted ones should vent naturally since air rises in liquid. So I'd say clocking is a moot point on your car.

Temecula is on I-15 approximately 65-70 miles north of San Diego, 40 miles or so south of Riverside.

__________________
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.