Mitsubishi Repair: over heating, radiator leak, coolant system

Question
i  have  an 89 grand voyager 3.0liter v6 moter. resently  i  lost the  timing  belt  and  water pump.  so i  replced  them but it  started  over  heating  after i  replaced them. so then  i  chaged the  threostate and  put in a new  head  gasket  in  it.  got  all the  air  out  and  it  still is  over heating .  i  even took the  thermostate out. and  it  is  still over  heating .i  haved it  tested to see if the  head or  block was  bad  but  wasnt . im  out  of  ideas   what  else can  cause  it  to  over  heat . help  please !!!!

Answer
Dawn,
There's really only a few main causes for an overheating engine.
- Insufficient amount of coolant mixture
- Too high of an anti-freeze to water ratio (less than 30% water)
- Lack of coolant flow (weak or dead water pump, or blockage in the coolant system; radiator)
- Leak in the radiator
- Radiator fan is not kicking on
- Thermostat that is stuck closed
- Lack of engine oil, causing engine to get so hot the coolant boils out

You can check off the list what you can be sure of is NOT the problem.  You mentioned you replaced your water pump and the belt that drives it, so I'll assume that is functioning.  you mentioned you completely removed your thermostat, so I'll assume that's not the cause either.  

Aside from those two items, check all the other items I mentioned in the list.  Odds are, one or more of those items is the culprit.  And don't make any assumptions.  Have the water pump and it's belt double checked again.
Good luck!