Hello All!
I have an 89 Deville 4.5L. The past month or so I keep having to add coolant to the radiator, but my overflow reservoir is always full. It seems as the coolant is not being drawn back into the radiator after the engine cools down. I replaced the radiator cap, flushed the heater core and radiator as of recently as well, but problem still occurs. I always added the cooling system sealer tabs to radiator as per instructions after coolant changes, but after the last time, my heater core was plugging up. So, I refrained from using those tablets the last time. Now after last flush of the heater core, I have noticed the issue of the coolant loss after every few hundred miles. I did check the oil and havent noticed any coolant there. Any tips or info on this issue would be appreciated!
Thanks,
Mike