I have an 88 Ford Bronco II. When I went to a trip about 3-4 hours. When I came back up here I didnt change the oil like when i was supposed to. I also started to have problems with overheating. I got it checked over several times and they said that everything was fine only that it loses antifreeze but there are no signs of leaks in our outside of the motor or vehicle. Then i heard a clicking noise one day and i ignored it. When I accelerated it went away. then it got worse and and continuely happens. I got another oil change later and still the same thing happens. I uses up oil also now and when it heats up the clicking noise starts up again. The higher the RPMs the faster the clicking noise. Any Ideas what it could be?