new head, head gasket, new thermostat, new rad cap, new radiator and hoses, new water pump. my compression is good all across 180 psi. i dont see any white smoke on start up, none of the spark plugs look like they have been burning coolant, and my oil is always good never milking. but when i purge the coolant system im always getting bubbles coming out. and my idle will be high for a sec or 2 then drop to right level about 500 rpm. i cant find any leaks. and im thinking my idle issue has something to do with the bubbles showing up in the radiator. i do have to add fluid every once in while. about once a month. any ideas?

 

If you're seeing bubbles continuously stream out of the radiator when you rev the engine cold with the cap off, the head gasket is leaking. This is often the only symptom of a slow leak-- as well as losing coolant slowly or having it all get pushed into the reservoir tank, eventually leading to overheating because of a bubble of air in the top of the engine.

 

not revving engine. just letting it idle and come to temperature by idleing. do not want to replace the head gasket again because i just replaced that with a new head les than a year ago. ugg.

 

i performed a co2 test (combustion leak test) on the radiator. the fluid never changed color. supposed to change to yellow if it detects co2 in the radiator. it didnt stayed blue. so thats telling me that the head gasket is good. if thats the case, how else could i get constant bubbles in the radiator and not seeing any apparent leak from anywhere? anyone have any ideas?