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For the past few days I have had some overheating at different moments. The mechanic who changed my water pump and timing belt this Monday recommended I change the radiator cap and driver’s side radiator fan. I did those two today and verified that fan is turning on when it wasn’t before as well as the new cap is snug with no leaks.
A few notes:
-The thermostat was changed about a year back
-The head gasket was changed Dec 2012
-I am not having to add coolant.Any thoughts on just flushing all the coolant out and starting fresh as well as changing the thermostat?
OBD2 code 118 was thrown up today.
Vehicle: 99 Mitsubishi Eclipse 2.0 non turbo; 271K miles
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Might try a chemical system flush then back flush it out.
Also check to see if there is any flow restriction in the radiator.Well it has only been driven about 13 miles so far (40 min) and it seemed to be only at highway speeds.
A couple of thoughts.
1. Is your water pump OK? The impeller may be degraded enough that it does not move enough coolant.
2. The P0118 is an issue with the ECT, so this may be related. I don’t have a any experience with Mistus, but it’s possible that the cooling fan is not being turned on because of the substituted value in the ecm.
Good luck, let us know…
How old are the rad hoses? If the stiffener in the bottom hose has rotted and failed, the hose could pinch shut and restrict coolant flow to the pump.
With the engine off and cold, grab the bottom rad hose about 1/2 way along its length and squeeze firmly. If the internal stiffener is OK, you won’t be able to squeeze the hose shut.
The ECT code can’t be the source of the problem and yes, I’ve seen many mitsubishis rolling around with that light on and not overheating. The reason I rule out the ECT is because this is happening only at speed when the fans aren’t needed.
These cars aren’t difficult to bleed out so I would rule that out as well. What i recommend you do is roll on down to Napa and get some coolant exhaust gas test strips. Or just order them online. For like $7 you can test your coolant for exhaust gases and see if the old head gasket is coming back to haunt you… Which is what your problem sounds like to me. If the test comes back clean then get your hoses and thermostat replaced and flush the system.
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