So this morning my add coolant light (and a rather shrill, non stop buzzer) went off, so I stopped the car, checked the radiator, there was coolant up too the cap, and the reserve tank was full, I drove into work and the temperature stayed in the normal range the whole way, again checking the reserve tank (no way I was popping the radiator cap hot), and it was fine, the add coolant buzzer went off intermittently through the whole trip, sometimes staying on for ten seconds, sometimes going ten minutes with no fuss.



Any suggestions on what might be the issue? The car's not overheating, at least on visual inspection the fluid levels seemed fine, and the engine's still running smooth.



1988 SE 170k Cats removed.

 

take off the rad cap and fill it to the top , start the motor and if you see any small bubbles in the coolant you have a leak somewhere, check all of you hoses to see if one is cracked.Mine did the same and it was the coolnt seal