My truck has random bouts of overheating in which ive traced to the headgaskets leaking externally. Getting new headgaskets if my tax return comes some time this year lol. But there wont be enough for new heads or getting them re done. Of all the times its over heated i dont think ive let it get all the way to the h though its been close and everytime its happend ive taken it a bit easyer on it and let it cool and if i had to drive id turn the heat on and monitor the temp guage didnt go over 3 quarters and if it did i would immeditally shut it down. Should i be worried about the heads? Doesnt burn any oil doesnt smoke well in the morning it does if you rev it but i think thats just from wear and tear.