Weird coolant problem.... Help!!

[switch]

ok just replaced headgasket and had the head rebuilt and all the seals replaced,
but every time i stop the car at a light, or park most of coolant comes out through the overflow tube, then the car overheats because all the coolent gets thrown out, then i put more coolant and the temp goes back to normal and then after i drive for awhile at a normal temperature, i stop the car and all the coolent gets thrown out again what could it be???

 

[billdo_83]

Have you replaced the thermastat or bled the system of air?

 

[1fast97gsx]

Have you replaced the thermastat or bled the system of air?

yea check thermostat.

 

[switch]

no, but i am buying a thermostat today, and how do i bleed the system of air??

Thanks

 

[Morphius]

Check the radiator and AC fan. My money is on the main fan which is likley bad.
Check the relays for the fans.
Check the temp sensor in the radiator.
Check the thermostat.

The system will naturally, bleed the air out. Leave the rad cap off while you fill it and let it run.

 

[pboglio]

Sounds like your headgasket isn't sealing right and your "pushing" coolant into the overflow. Same problem I have and I've changed everything in the cooling system except the radiator. I retorqued my stock head gasket and the 4 bolts on the outside corners were a good 10 ft*lbs. looser than the rest. Looks like my head warped a little and stretched the outside bolts, just like a warped exhaust manifold. If you keep overheating than I don't think your head would be flat anymore.

Gene

 

[switch]

nah ist not a head gasket, but i found that my radiator cap spring and the were all messed up, that caused all the coolant to get pushed out

Thanks for the help.