Well I got in my NA today and started it up to go to school. The "ADD COOLANT" buzzer came on immediately so I turn the car off and go inside to get some water. I fill up the coolant and it took 2/3 of a 2 liter bottle. I start the car back up and go to school. Get up I75 and as soon as I actually get on the buzzer comes on again. It stayed on the entire time I was on the interstate, until I got off the next exit. Right when I got off it turned off and the temp went down some. It wasn't running hot, just warmer than normal(my normal is usually very very close to the C and it was at like 1/4 the way up). The buzzer came on for a brief second on the way home and that was it. Does anyone know what could be wrong? Thermostat? Water pump? Best guesses please. Or does my car not want to go to class as bad as me?

 

Well, had anm almost similar problem. Seems like you're losing some coolant when the pressure in the cooling system gets too high You should have your cooling system pressure-checked. Check for any hoses that might be split. Check thermostat and its housing. Also, does this happen when you turn the heater on ? If so, replace heater hose as well.

 

I am thinking the same thing of having it pressure tested but right now my TII comes first. Thing is I changed the water pump and thermostat a little while ago. About the heater...its April in Florida..lol...haven't had the heater on in a while but I will check.

 

I had the same problem on my FD. Turned out to be a bad filler cap leaking just a wee bit lad. I know this dosnt probably apply to a FB or FC since they don't have a stupid PST tank. However it's the same basic concept, a leak somewhere in the cooling system.

 

See its weird though. I know there was coolant in the system. Couldn't have leaked enough to have the buzzer come right back on yet. So its like the coolant wasn't going anywhere and thats why I think it could be the thermostat.

 

Did you bleed it after you filled it? If there was air bubbles in it, they can cause the sensor to lose its ground and go off.

 

To tell the truth I am not sure how to bleed the coolant system. Never done it. Do you just leave the cap off until all the air bubbles out or what? Thanks.

 

You are supposed to loosen the little bleeder screw on the side of the radiator. They strip too easily though. I just let it run with no filler cap, until the thermostat opens, to make sure all the air is out. A little squeeze on the top radiator hose with the cap off helps too.

 

i agree try bleeding the system that was my problem and it never hurts to replace that cap it's only like 15 dollars from corksport.

james

 

Take a 17mm wrench.
unplug the sensor which is dead center on top of radiator.
Loosen sensor about 7 turns till air comes out.
pour coolant in rad cap until it comes out the sensor.

I think this works better than the bleed screw as far as getting the air out from where the sensor is

Patrick Harris

 

Wait, run with filler cap off? Won't this shoot liquid everywhere? I a confused and have the same problem. And I want the same solution

 

Loosen the air bleeder valve

 

yea, I had a leak at my water pump once and had to refill it constantly until I got the gasket....
Take phillips screwdriver.. unscrew bleeder with your refill cap off... You may hear it move around when you take bleeder screw off... If coolants squirts out screw it back in... and then fill from the filler hose..

if no coolant comes out.. Fill into filler neck until it squirts out and then screw back in, and fill neck completely.. BINGO

 

I just had to deal with this last weekend.

First, check your coolant overflow reservoir the next time the buzzer goes off. If it's low/empty, you're okay - it's a leak. If it's right full and pissing out coolant, you've got a seal failure in the engine (it's stewed.) Dunno if you already know to do that (can't read your mind from here) but it doesn't hurt to mention it.

And running with the coolant cap off won't spray coolant everywhere (unless you do have a seal failure.) You'll get a few air bubbles once in a while and that should be all.

Do the air bleed as described. You must get as much air out of the system as you can - air lock will stew your engine.

And did you put some Water Wetter in with the coolant? It's worth it.

ttyl,
Amur_

 

Having the overflow tank full DOES NOT mean you have a seal failure. Seeing bubbles coming out from the radiator when engine is running and in operating temp, now that's seal failure. A full overflow tank means that you have a small leak somewhere in the cooling system (radiator, cap, thermostat, housing, hoses, water pump, and water pump belt). The last one is not a leak , but it could lead to cavitation -> air -> buzzer

And it doesnt take much coolant loss for the buzzer to start....buzzing The sensor is actually sensing low pressure in the system, not low coolant level...