Have a 1990, service engine light on for cam sensor, car runs good. Mechanic replaced ecm, cam sensor, cranks sensor, idle air control, oxygen sensor, water pump (leaking), antifreeze from green to red, temp sensor, thermostat, ignition coil, ignition module, wires, plugs. What happened went to pass a car by flooring it, moved sluggishly service engine light came on, took it to mechanic low coolant as water pump leaking then all other things replaced light still on. after ecm switch using same proms as soon as you start car the temp gauge goes to hot which shuts down ac compressor but mechanic scanner says temp normal. Took it to different mechanic on his scanner shows just after starting temp is higher then air temp, not normal. Also sometimes when I start car get elecrical problem light where climate fan comes on and temp setting goes to 75 degrees cannot control heat/ ac etc shut motor off restart normal but must reset temp from 75 to whatever I want. Any new ideas would be helpfull