COPYRIGHT WARNING:
All pictures and texts in this web page are the property of nomaallim.com. Any use of any part of those contents without the written consent of nomaallim.com shall be subject to legal procedures as per international and local laws in the concerned country. Using the name "nomaallim" or "nomaallim com" or "nomaallim.com" in the text describing the unauthorized copied content shall not constitute an exception and shall be sanctioned in accordance to the effective laws and proceedings.
All pictures and texts in this web page are the property of nomaallim.com. Any use of any part of those contents without the written consent of nomaallim.com shall be subject to legal procedures as per international and local laws in the concerned country. Using the name "nomaallim" or "nomaallim com" or "nomaallim.com" in the text describing the unauthorized copied content shall not constitute an exception and shall be sanctioned in accordance to the effective laws and proceedings.
BEFORE YOU START
DISCLAIMER:
Our pictorials are of informative nature and do illustrate works carried out by ourselves at our own premises for our own use and satisfaction. Readers who envisage to carry out similar works inspired by the below method shall do this at their own risks and liability. |
|
Main causes of a Mitsubishi 4B11 engine overheating
The Mitsubishi MIVEC 4B11 engine is associated with a non-pressurized cooling circuit that still uses aluminum alloy manifolds and thermostat housing, instead of plastics.
Two fans cover the whole area of the radiator on the Lancer 2.0 EX.
The thermostat is a simple thermocouple based device.
While aluminum ages better than plastics, it is subject to both corrosion and erosion; with the rubber hoses connecting to it by a simple insertion and a screw collar clamp this leaves room for leaks that need to be checked.
Here are the main causes to an 4B11 engine overheating problem:
Two fans cover the whole area of the radiator on the Lancer 2.0 EX.
The thermostat is a simple thermocouple based device.
While aluminum ages better than plastics, it is subject to both corrosion and erosion; with the rubber hoses connecting to it by a simple insertion and a screw collar clamp this leaves room for leaks that need to be checked.
Here are the main causes to an 4B11 engine overheating problem:
- Leaking radiator cap
- Leaks from the cooling circuit
- Damaged radiator fan cable or connector
- Stuck thermostat
- Blown head gasket
- Defective fan fuse or speed controller
- Other causes like a clogged radiator if water was used instead of coolant and on high mileages
How to replace the fan motor on the Mitsubishi Lancer 2.0 EX
On this Mitsubishi Lancer, and following an accident that damaged the front-right side of the vehicle, one of the fans had its cable cut. The repair carried out was of poor quality as the electrician fitted a wire of a smaller section that lead to the fan's connector overheating, melting and failing.
The repair consists of the replacement of both the motor and the wire, purchased at a scrap yard.
The repair consists of the replacement of both the motor and the wire, purchased at a scrap yard.
|
|
|
Removing the cooling fan assembly from the engine compartment
Disconnect the fan motor wires then using two flat screwdrivers, one on each side, press the plastic latch that holds the radiator fans assembly to the radiator housing and pull the latter up gently making sure not to damage the radiator fins.
Replacing the damaged fan motor
Remove the fan blades by unscrewing the center bolt then remove the motor bolts.
Fit a new motor and reverse the steps.
Fit a new motor and reverse the steps.
If you purchased a used motor, make sure to clean well the connector with an Electronic Spray cleaner, and the one of the wire harness as well.
Make sure to attach the fan wire harness to the fan assembly:
|
|
|
Refitting the fan motor assembly to the Mitsubishi Lancer EX
Gently and carefully introduce the fans assembly between the Lancer's radiator and engine taking care again not to damage the radiator fins. Proceed as shown with an angle first, then make it level, place it on top of the plastic latches intended seats and push it downwards.
Refit the wire connectors.
Refit the wire connectors.
