water boiling in ast?
 

everytime i get home after a nice easey or herd drive i here water boiling in my stock astit is causing my car to be a tiny bit low on water every morning i mean abought 5 tablespoons low not enough to turn my coolent light on. ?what is causing this to happen?

It should be air in your cooling system that you are hearing. Flush your system and burp the coolant.

If burping the system does not work try replacing the caps. Sometimes a leaky ast cap will do that as well.

Edit- a leaky cap will let air in your system.

could it be a leaky cap on ast? does anyone have a link to properley fill the radaitor and or burb the system I just put new fluids in it over a week ago.

Seems pretty normal to me. When you shut your car off the residual heat in the motor is going to cause the coolant to heat up to a higher temperature than it was right before you shut the car off. Since there's no coolant flow or air passing through the radiator this increase in coolant temp is going to cause an increase in pressure. The AST is where excess pressure is bled off to the overflow tank. You're probably just hearing that going on. Once the water cools down, it'll contract causing a vacuum to form. At this point the vaccum should cause the coolant that was pushed into the overflow tank to get pulled back into the system. If your overflow bottle isn't up to the right level it may be sucking a bit of air back into the system. If your coolant low buzzer isn't coming on I wouldn't worry about it, just make sure your levels are good.

Seriously, just look at this thread. If more people used these threads so many people would be highly knowledgable when it comes to FD3S's it would be ridiculous, myself included.

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/faq-3rd-gen-other-useful-links-68640/

Look in the C section C as in Coolant:wink:

no the light will come on say over aperiod of a week it shouldn't do that i know there is no leaks as far as water goes it is just gettin frustrating to put some h2o in it avery coulpe of days to keep from hearing the low coolent buzzer. And the overflow is full.

Does your car puff white smoke on startup by any chance?

hey thanks i think i will get that burping tool while i am at it a 180 thermostat new ast+cap and some new hoses if that doesn't wk i give up.

no not even a little maby some real hard to see black though all emissinons gone stock ecu=rich

I wish I had the burping tool, it is very usefull.

For all your stock parts contact Ray Crowe of Malloy Mazda at hmkparts@aol.com or his phone (which is the best method to reach him) at 1-888-533-3400. Morning calling is the easiest way to get through to him.

And luck you he is having a special for all the coolant hoses at 160$!!! Mention that to him it is a good deal. If I were you I would also change all the clamps at the same time I change the hoses :icon_tup:

Link to the Sale Page:

https://www.rx7club.com/showthread.p...ight=Ray+Crowe

Cheers,

Alex