I've read a few post on climate control issues, sounds like a lot of problems My 1987 300E works like it suppose to but it has to warm up first. Otherwise it is dead not even defrost works first thing in AM.Does this sound like a coolant temp. issue I tried to ground the green wire in climate control this only pegs coolant gauge in dash. What sensor on engine is climate control looking at I can see 3 on head one is a single wire, one is 2 wires and one is 3 wires.