About 3 months ago, my '89 N/A blew out the left heater hose. I first thought it was the radiator, replaced that. When I filled it up, I then saw the hose was blown. Replaced the hose and refilled it. My add coolant buzzer was on. Figured it might be the cap, but no. I just replaced the sensor from the dealer, but no help.



It does not stay on all the time. It happens to go on and off when it feels like it. When I unplug the sensor, the buzzer goes out, but then goes back off a minute later. There are no visible leaks and the radiator is topped off; the car does not overheat either. Please set me in the right direction.

 

You have air in your system.



On a cold engine, you need to take a funnel and put it in the radiator, add coolant so its about 1-2 inches up the funnel, then start the car and wait.



Once it is up to temp, the thermostat will open and water will circulate. That is when the air will work its way out, it might take a little while. Just make sure to add coolant to the funnel if its goes down.



Once you are satisfied you got the air out take it for a checkout ride.

 

Thanks bud. I have all ready done that, but its worth another try. Maybe I didn't wait long enough. I 'll let you know if that works.

 

Thanks- The past two days the buzzer has stayed off. I did notice that it did have a couple of air bubbles, but I pulled an Amateur mistake. I followed the wire down off the sensor and found that it was melted to a oil cooler line. Wrapped a wire loom around it; all problems solved so far.

Thanks again.

 

I am pleased it worked out for you.