» » »

BMW Q&A

Ask Your Question

1998 BMW 740i Question: Engine Overheating

 

Question

Pollard, Victorville, CA, July 18, 2010, 11:09
 Rookie

My engine overheats when the air conditioner is running. When the air conditioner is off the thermostat returns to normal... I have replace the coolant, thermostat, radiator cap, radiator heat sensor, all hoses and installed a new radiator. Could my problem be a bad water pump? The timing and head gasket are fine...

1 Answer
Flag This
  • Answer #1

    July 20, 2010, 05:16
    Profile_thumbnail
     Master

    If the coolant has been bled properly, no leaks present, check viscous fan operation, thermofan operation, thermoswitch operation, remove and visually check waterpump.

    Reply
    Flag This