Sorry for anbouther coolent post but i did a search and found alot of help but now its different. Ok first it was blowing the coolent back into the overflow tank and then add coolent buzzer goes off and it heats up never taking the coolent from the tank. so i went on a search and replaced the radator cap and the cap where the themostate housing is. it blew the hose off going to the refil tank one day so i got a clamp for that and its been fine , then i checked for leaks flushed the system etc still same thing. so i read about the block seal and tried that yesterday. it worked fine alll night and then the next day i go out it runs under the half way mark and was fine for about an hour untill i came to a stop and 2 mins later after i started moving it shoots up and starts overheating and the buzzer goes off? The buzzer also will stop going off when you tach up to 2k or above when ideling. liek it will sound and as soon as you tach or rev to 2k rpms it just stops untill it drops back to idel. Its not flushing back into the overflow tank now though its just heating up and i see no leaks after alot of checks. also a new thermostat and i also tried running with no themostat. any ideas? and theres no smoke and no prob starting. Thanks

 

i had same problem check your fan more sure its running right,oh and make sure theres no air in system

 

sounds like your coolant seals to me, time for a rebuild www.rotaryresurrection.com

 

sorry to bring this thread back but the same thing happened to me and i had first idea of the seals being gone. its like compression is leaking in the cooling system. but i fill it up with water/coolant and check for bubbles when started, NONE. so im confused. i replaced the thermo stat with a new one fromm the local parts store. but it might be bad so im gonna go dealer. then i was thinkin it could be water pump.?..any suggestions on that. ill check my fan tomarrow and im pretty sure i get all the air out using that pet **** at the top of rad. but now its all stripped out and **** because of doing it so much and because whoever owned it before me started stripping it. but anyways help would be nice. oh and if it was the seals wouldn't i loose power or coolant be coming out the exaust?

its an 87 TII BTW