NEVER mix refrigerants.

My 1978 300SD is all original. I recently installed a new expansion valve and new compressor. I refilled the system with R-12. The auxillary fan comes on (cycles) when it is very hot outside, but my vent temperature is a very consistent 44°F on the road in 100°F weather and 48°F during prolonged periods of idle.

I have adjusted the ETR and produced 38°F in the vent, but felt the original setting of 44°/48°F was probably better for the system.

The nice thing about our '78 300SD is how hard the blower blows on Auto Hi. I think the amount of air it moves around makes it fell cooler than it really is....Robert

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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership