At about 2000 rpm my truck will change the air flow from pushing air out of the front dash to pushing air to the defrost! I am sure its a vacuum problem but am having trouble identifying where the problem is at. The truck will also act like its vapor locking after about thirty minutes of driving unless i keep it at about 1500 t0 1700 rpms then it will take as long as an hour before the problem shows itself, am getting about 9 to 10 mpg also can someone help me?
- posted
16 years ago