i found 87 300d and 87 190d 2.5 turbo both mint condition with low miles...is this a good year for mercedes diesel...what do i need to look for i heard something about overheating in 300d...also 190d is one owner car so the price is high....300d ac doesnt blow cold air thru center vents...im just trying to get best help before i invest my money into it...i need to know good and bad...i did my google search and this year seems to be the best but again i drive a dodge diesel dont know to much about them...thanx for all help