While I’m driving oil pressure light beeping 3 times!!! I change oil pump! Oil pressure sensor! What next??

Engine over cooling. When heater is set to max heat and heater fan is on only luke warm air comes out of heater vents. Temperature Gauge does not go above the lowest mark. Gauge is working o k as when… 

Removed fuses in engine compartment to for blow heater fuse now engine management light on and glow heater light the car would reave up?

Showing triangle sign with arrow around it.

Hi can I have any help I seem to only have windscreen selection for my blowers inside the car is there anything I can do to get this problem fixed just had the air conditioning regassed and it's only…