STEP 1. Check for coolant leaks.

WARNING: This page is about a different car, the 2003 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: When pressure testing the cooling system, slowly release cooling system pressure to avoid getting burned by hot coolant.

CAUTION:

Be sure to completely clean away any moisture from the places checked.
When the tester is removed, be careful not to spill any coolant.
When installing and removing the tester and when testing, be careful not to deform the filler neck of the radiator.

Check that the coolant level is up to the filler neck. Install a radiator tester and apply 160 kPa (23 psi) pressure, and then check for leakage from the radiator hose or connections.

Fig 1: Checking Coolant Level

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is leakage present from the radiator hose or connections?

YES : Repair or replace the appropriate part, then go to Step 2.
NO : There is no action to be taken.