More info required.

Have you done something? Do you just want to add more refrigerant? What's the deal? Plenty of people here know how - what we don't know is what exactly it is you want to know.

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'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
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"Back off, man. I’m a scientist” ~ Peter Venkman