Initially, I overheated and had NO TEMP on the gauge dash at all. Total thermostat failure. Changed it and had no problem for 4 weeks. Then acted like l had air trapped. My cousin purged the air out the hose housing until it was almost fixed but not 100%. I then changed thermostat again in case l had a bad one... and everything seemed resolved for 3 weeks until a sudden over heat... so l went back to trying to purge and could get the Allen bolt to turn at first so l opened the thermostat up and filled it till it poured from there and it resolved again... then suddenly several days ago it overheated again. I finally got better leverage on the allwn bolt to purge air and am on my 3rd time purging air from there. It does have air when l open it, so ... l continue to purge it