I just bought a 1994 C280, price was right. This is my third C280, I bought it at a low price and knew that it had problems. Worse case its a parts car, but it only has 120,000 mi. Here are my problems.

1.The blower fan starts running as soon as you turn on the key, and it eventually blows hot once the car is hot. It also continues to run a few seconds after you turn the key off. It doesn't matter what you do with the ACC system buttons, it runs at what I think is wide open.
2. It idles poorly.
3. The previous owner removed the Duovalve and bypassed the aux coolant pump below the air filter housing.(Not sure why)

My code reader says:
P0116 - Engine Coolant Temp CKT Range/Perf
P0101 MAF VAF Range/Perf.

Granted, the poor idle is probably the MAF.
I suspect the coolant temp sensor is telling the ACC that the car is overheating and is running the heat at full speed to dissipate the overheating. Or maybe I have a bad relay or a bad ground.

Any ideas?
Thanks in advance.
Michael Towns