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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. NOTE: this tutorial is valid for the following Mitsubishi, Peugeot and Citroën models:
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Why cooling circuit housings and manifolds could get corroded and leak
The thermostat housing on the Mitsubishi 4B11 engine and its related hose connecting housings are made of aluminum, not plastic. While both materials age differently, aluminum in particular is subject to corrosion, especially if at some stage you stop using coolant and replace it with water!
Corroded aluminum tubes are also subject to quick erosion leading to leaks where the rubber hose connects to them.
If you're facing such leaks, you may apply the below fix, which is quite easy to be carried out by any DIYer.
Pay attention to the fact that this requires opening the cooling circuit, check the below link to see how to drain it prior to dismantling the thermostat housing to avoid coolant spills, and later to refill and purge the circuit on the MIVEC engines.
Corroded aluminum tubes are also subject to quick erosion leading to leaks where the rubber hose connects to them.
If you're facing such leaks, you may apply the below fix, which is quite easy to be carried out by any DIYer.
Pay attention to the fact that this requires opening the cooling circuit, check the below link to see how to drain it prior to dismantling the thermostat housing to avoid coolant spills, and later to refill and purge the circuit on the MIVEC engines.
How to fix leaking thermostat housings on Mitsubishi Lancer 2.0 EX
Unscrew the rubber hose clamp and pull it out while holding it firmly with your bare hand. Do not use pliers or screwdrivers as you could damage the rubber hose.
The last picture shows the scale build-up inside this housing due to the fact the vehicle's owner was adding water to the cooling circuit, instead of coolant.
The last picture shows the scale build-up inside this housing due to the fact the vehicle's owner was adding water to the cooling circuit, instead of coolant.
Unscrew the bolts that hold the concerned housing or manifold and remove it from the vehicle.
Fix the corroded thermostat housing on a vice and clean it with a metal brush as shown:
Clean well until getting the rid of the white powder, called alumina. Do not leave any.
The hand brush is not usually sufficient to remove alumina from deep holes, use a drill mounted brush instead if needed.
The hand brush is not usually sufficient to remove alumina from deep holes, use a drill mounted brush instead if needed.
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Refitting the thermostat housing on the Mitsubishi Lancer EX 2.0
If you had cleaned the thermostat housing itself, you don't need to create any gasket, since the thermostat includes a ring-seal; if the corroded housing is the one on top of the thermostat, a double outlet manifold, then you must use an RTV silicone gasket maker to ensure coolant circuit tightness.
Reverse above steps then fill and purge your engine cooling circuit.
That's it!
Reverse above steps then fill and purge your engine cooling circuit.
That's it!
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