1995 ford taurus-service enginge light is coming on after 10 mins of driving--heater blows hit while moving cold while stopped--no other probs-coolant is full--can AC Compressor cause this?

Sound like two problems first sounds like a vacuum leak causing the door to close on the heater core. then when stopped the vacuum is less causing the door close blower motor blowing cold air. Vacuum is better when driving and door is open on heater core and warm heat coming out. Look at all your little vacuum wires for cracks a 95 model hoses are very brittel