[geoffcurry]

I have a 2006 Hyundai Tucson 2.7 v6 fwd, it seems to go through coolant, every time I change the oil I have to refill the coolant reservoir, theres no coolant leak anywhere, im just wondering if its normal to have to keep refilling the coolant reservoir so often?

 

[sam o nela]

Its a closed system, so it has to be going somewhere.

If its every Oil change, it could be a very slow, seeping leak that happens when the system is under pressure (while driving) and just evaporates...so you'd never see it.

A pressure test of your cooling system can help reveal this....as a start.

 

[Easy Rider]

Its a closed system, so it has to be going somewhere.

AKA....there IS a leak somewhere; you just haven't found it yet.

If it is not leaking out somewhere, it might be leaking IN.....to one or more cylinders and the oil from a head gasket fault.

Do you have white foamy stuff on your dipstick or the oil filler cap ??

 

[newtech]

With cool engine, open the filler cap. Check the condition of the gasket, is it seated properly, any wrap/crease on it.
Also check around the neck around the fill cap for any green dots.

Once my old Integra actually seeing green dots & no leak at the hose joints. Finally found out it was the faulty filler cap.

 

[[email protected]]

Replace cap.
Next check each hose at connection/clamp.
I had an upper hose at the clamp start as a pinhole then as residue built up, the leak increased. The stock clamp was failing, I guess. Replaced hose and used aftermarket clamp.