Being new to the forum I've been cruising the sections soaking up all the good info that's been compiled.
I see that there's ample coverage on the surging idle issue, and the common implication of air in the cooling system causing this malady. One thing I haven't seen mentioned in threads relating to this topic or the associated topics of how to bleed the cooling system is the importance of making sure that the little tube in the overflow reservoir is actually connected.
I know it sounds stupid basic, but I don't look into that tank very often - if you find air in the system and go through the steps of bleeding, the condition improves, and then gets worse again, it could be because the reservoir tube has shaken loose or isn't connected and air gets sucked into the system though the overflow port that is open to the air when the engine cools.
Just one of those little things that's east to overlook and can leave you scratching your head...beats replacing your head-gasket if that's all that it is!
I see that there's ample coverage on the surging idle issue, and the common implication of air in the cooling system causing this malady. One thing I haven't seen mentioned in threads relating to this topic or the associated topics of how to bleed the cooling system is the importance of making sure that the little tube in the overflow reservoir is actually connected.
I know it sounds stupid basic, but I don't look into that tank very often - if you find air in the system and go through the steps of bleeding, the condition improves, and then gets worse again, it could be because the reservoir tube has shaken loose or isn't connected and air gets sucked into the system though the overflow port that is open to the air when the engine cools.
Just one of those little things that's east to overlook and can leave you scratching your head...beats replacing your head-gasket if that's all that it is!