We have a Holden 2004 exe. On short distances, the car runs fine. However, driving far we've noticed water gushing out from the right front side of the car where the reservoir is. The temperature gauge does not change though. When we got home the car was boiling in the radiator.
We had taken it to two different mechanics one said it was because of set plug in the engine and another one (trustworthy) said he cannot tell us the problem because the car would not boil again in front of him so he can not tell what it could be.
Does anyone have an idea what might be going on?