My Q45 is overheating after driving about twenty minutes at high speed. On hot days over 95 degrees. In phoenix, that is every day. I cleaned and flushed the cooling system, changed the thermostat, cleaned the MAF sensor, changed hoses, turned on the heater or AC, but nothing has made any difference. I also notice a loss of power when it is hot, and some engine farts too, so now I think my CAT my be the problem. How can I check the CAT on the vehicle?
Sunday, July 1st, 2012 AT 2:06 AM