ok so i topped off my rad this mornign and started the car...it ran at good temp and the heater was working...just now i went back out and topped it off again (just filled it, working the air out) and it was idling at 1500 (normally idles below 1k) and the heater started blowing cold...so i turned the heat off and turned it back on after 30 seconds and it was hot again and then the idle climbed up to 2k and the temp started getting hot...so i shut her down...this cooling issue has been pissing me for a few days now n im trying to get to the bottom of this cuz i dont wanna go for a drive and overheat...

 

i went out and started ti again and the idle was at 2500 and the coolant overflow bottle which was normal this mornign was full to the top and a lil bit of froth on the very top...whats goin on?

 

I would start from the begining and flush the whole system it sounds like something is blocked.Check all the coolant hoses ad feel for any blocks.The fact that your overflow bottle was full tells me the the system is building up too much preassure.

 

the flush bottle says use one bottle for a 12L cooling system should i use 2 anyways?? maybe make it stronger? it wouldnt hurt would it?

 

i would only use what is needed.even if u have to use 1 1/2 bottle.

 

if you have to keep addin coolant then your coolant seal is bad , i just had the same problem and i ended up havin to swap the motor out , check you radiator hose if it is really hard then your def up ***** creek

 

naw its not super hard...

 

sounds like air in the system.that or a stuck thermostat..

 

I had something similar but not as bad. Turned out I had a leak behind my waterpump. Can try looking for a leak and fixing it. When you turn your car off its supposed to suck in the coolent from the overflow. If there is a leak, it'll just suck in air instead and push stuff out when its warm until your overflow bottle is overflowed.

 

the thermostat is brand new from mazdatrix so it shouldnt be that...i pulled the radiator and looked inside n it looked a bit rusty (****** people not usin distilled water) so i ordered a koyo aluminum piece that should be here in a few days...im gonna backflush everything throughly and check for that leak behind the pump but it doesnt appear to be leaking anywhere...and im pretty sure its not the coolant seal cuz it doesnt smoke at all and there's no coolant in my oil