Coolant Problem

[JoeeS3]

I found this problem rather strange

If i start my car up in the morning then drive off my coolant low light will turn on! i have to pull over and open the cap slowly to relieve the pressure. but the coolant bottle looks empty before but fills up when i open the cap completely then when i close it i can drive off again and dont get any low coolant light appearing. but as soon as i turn my car off for a few hours i have to repeat all that again.

Also, if i run the engine with the cap off, the coolant will bubble for a few seconds, stop for a while then randomly bubble again. i dont think this is the head gasket as i have no white smoke/steam coming out of my exhaust on no mayo stuff on the oil cap.

Thanks in advance hope you can understand what im trying to say!

Joe

 

[<tuffty/>]

Sounds like an air lock/not enough coolant... whats the level on cold?

<tuffty/>

 

[JoeeS3]

i havent checked when on cold as of yet will do that tomorrow, i believe its quite low though but as soon as i take the cap off it comes up to the min and max

 

[<tuffty/>]

Its called an expansion tank for a reason lol... its fairly normal for the level to rise a bit but needs to be topped up to ensure the level is right...

When was the last time the coolant was changed? might also be worthwhile doing a hydrocarbons test too although if the coolant has not been changed in a month of sundays that may not help

<tuffty/>