wellheres the quick story.... bought a 86 AT (duh) and it had the typical blown internal water seal and puked all the coolant out of the overflow.. It was real bad 1/2 mile and it was overheating... but the preveous owner was very careful not to overheat it IE close to red but not in it .. So in goes the CRC Blok Weld( I think that the correct spellin') and wa la it driveable....but it was on and off... I could go 100 to 150 miles before the buzzer went off on an adverage. So off to San Diego we go about a 350 miles round trip.. .. On the way there it rocked.. 80 + the whole way ther and back

......Then it happend next day drinking coolant like a fish.... then It stoped tryed to drive it and got as far as kragan..before buzzer.. made it to kagan about 3 miles and got me somemore CRC B.W. So fill it up and samething buzzer right before home... so pull up to the hose and start flushin' and in goes the copper crap now a day later it starts like crap gotta pump it to keep it running for first 5-10 seconds.... did I over due it......BTW I did it per the RX7club.com and I put in fresh plugs after the crc thats for any info or experince

 

thats only a band-aid, you're going to need a rebuild.