H3 Coolant pooling in overflow reservoir

[Jonathan]

So lately , my '08 has started running hot every few months. Upon further inspection, it appears as though the dexcool is getting 'stuck' in the overflow reservoir, and not circulating back through the system. When i take off the rad cap, i can hear a rush of air as the vacuum is released. A quick pump of the siphon to get the coolant from the reservoir back into the rad fixes everything ... for a few months until the reservoir captures the fluid again.

Plugged coolant line? Leak in the system creating an airlock? A little help would be splendid. Thanks all!

 

[Best4x4]

If the engine is hot/warm it's normal for coolant to go into the overflow jug. Then once it cools down it should pull the coolant back in. Try replacing your radiator cap.

 

[alrock]

I second the radiator cap - you may not be getting a good seal there.