So, this morning I cleared all the codes and drove to work; the trip is about 35 minutes, almost all highway. The climate control system recirculation light was blinking constantly and the system was not working - no fan and full hot out of the side vents. I also had the check engine light illuminated, which was not the case before.

I stopped for coffee at the 7-Eleven up the street from my office, and after restarting the car the climate control worked normally and the check engine light was no longer illuminated. The stumble is still there, but it feels a little better - wishful thinking, maybe. I'm going to drive the car for a couple of days before I go back and check for more codes.

With regard to the other wiring harnesses in the engine compartment, is it simply a visual inspection to determine if they're bad? I know there are some wires near the oil filter housing that are showing cracked and crumbling insulation - how far do I need to go with this?

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Robert Fini

'12 ML350 BlueTec, 100k
'06 E320CDI (x2)
'05 T1N Sprinter 2500/Pleasure-Way Plateau TS, 70k
'97 C36AMG, 319k (son's)
'94 E320T, 249k
'93 190E Sportline LE, 168k (daughter's)
'84 190E-2.3/5spd (Stage Rally Racer)
'66 230 W110 Sedan (Barn Find, Vintage Racer build in progress)