My buddy has an 02 Camaro. His blower motor went out last night. Before it went out (the bearings have been on their last legs for awhile now) we noticed it cooled fine (noisily) but the heater was not blowing hot air. What are some places we should start looking? BTW this car has over 100k and last night was the first time the antifreeze has been changed. Could the thermostat possibly be an issue here?