I was driving home from work one night a couple of weeks ago to find my Chevy tracker temp gauge creeping up over the halfway point.  When I shut the vehicle off & opened the hood I found the coolant reservoir tank bubbling and completely full.  Once it cooled, the tank was still full.  I opened the rad cap to find no coolant inside the rad.  Since then I have checked the t-stat and replaced it.  I pulled the rad out and sent it to a rad shop who repaired a couple of fins and flushed it out.  I reinstalled 3 days ago and bled the system.  I have more heat now than ever, yes I realize it is summer time, but since doing all of this, I opened the rad cap tonight just to check the level & found the coolant is milky.

What does this mean?  My tracker is not overheating, the temp gauge is below 1/2 and the coolant is staying in the rad.  The overflow tank is not changing.  My oil is perfectly clean, no sludge, no milky residue in there.

HELP??
I should've mentioned that this is a 99 chev tracker with the 2.0 litre engine. automatic

Have you put on a new radiator cap yet?  That will stop your overflow from being able to drain back into the radiator.

yes I have.  I have stopped the coolant from flowing back into the overflow.  I've learned that the milky look from the coolant means that I have a headgasket issue.

Does anyone know how difficult it is to do an engine swap.  I was thinking of a 2.5l v6 from a grand vitara into my tracker.

Any thoughts please let me know...thanks

If you have the skills to do it... go for it!!! You will not be disappointed with the V-6... I love mine... It actually pulls 37's down the interstate at 70-75 with no issues... and will still kick down and pass someone if needed... You will need the engine, harness, computer and a certain auto transmission that will allow you to bolt the T-case to it.....

Zig