Description

Mitsubishi OEM Thermostat Housing Evo 8 Part #1305A043

Firstly, Buy Mitsubishi OEM Thermostat Housing Evo 8 1305A043 for the CT9A 4G63 cooling system. The Mitsubishi OEM Thermostat Housing Evo 8 1305A043 is a genuine Mitsubishi replacement thermostat case designed for the cooling system of the Mitsubishi Lancer Evolution VIII. This component provides the mounting location for the engine coolant thermostat and forms an important part of the 4G63 engine’s cooling system. For Evo 8 owners replacing an aging housing, rebuilding a 4G63, or restoring a factory-style engine bay, the correct OEM thermostat housing helps maintain proper fitment and compatibility with the original cooling-system components.

Mitsubishi identifies 1305A043 as a “Case, Thermostat,” and the part is listed as a genuine OEM component. Mitsubishi parts information also shows that 1305A043 replaces the earlier MN143307 part number.

The Evo 8 thermostat housing is particularly important to identify correctly because the Evolution VIII and Evolution IX use different housing configurations. Specialist Evo parts sources identify 1305A043 for the 2003–2005 Evolution VIII, while the Evo 9 housing is commonly identified separately as MD363250.

Mitsubishi OEM Thermostat Housing Evo 8 1305A043

The thermostat housing is a key component in the engine cooling system. It holds the thermostat in its designated position and works with the surrounding coolant passages, water outlet, hoses, and sealing components to regulate coolant circulation through the 4G63 engine.

On a Mitsubishi Lancer Evolution VIII, the thermostat helps control when coolant begins circulating through the radiator as the engine reaches operating temperature. The housing itself provides the structural mounting point for this thermostat assembly.

Over time, an original thermostat housing may be affected by repeated heat cycles, coolant exposure, corrosion, physical damage, or wear around its sealing surfaces. During a thermostat replacement or cooling-system overhaul, inspecting the housing is therefore important.

Buy Mitsubishi OEM Thermostat Housing Evo 8 1305A043 for the CT9A 4G63 cooling system. Shop the genuine Evo 8 thermostat housing online.

If the housing is damaged or no longer seals correctly, replacing it with the correct OEM component can help restore the original cooling-system arrangement.

Genuine OEM Fitment for the Evo 8 4G63

The Mitsubishi OEM Thermostat Housing Evo 8 1305A043 is designed around the Evolution VIII cooling-system configuration. The part is listed for the 2003–2005 Mitsubishi Lancer Evolution VIII, including the CT9A chassis and turbocharged 4G63 engine application.

Using the correct housing is especially important when rebuilding or maintaining a 4G63 engine because cooling-system components should match the specific engine and chassis configuration.

Evo 8 Thermostat Housing Applications

The 1305A043 thermostat housing is associated with Mitsubishi Lancer Evolution applications using the 4G63 engine, including:

• Mitsubishi Lancer Evolution VIII
• Evo 8 CT9A
• 2003 Mitsubishi Evolution VIII
• 2004 Mitsubishi Evolution VIII
• 2005 Mitsubishi Evolution VIII
• Selected Mitsubishi 4G63 applications

OEM catalog data also associates 1305A043 with other CT9A 4G63 catalog applications, so the safest approach is to verify your vehicle’s exact chassis, model year, and existing part number before ordering.

For international Evo owners, this is particularly useful because imported Japanese-market vehicles can have different production dates and equipment specifications from North American-market cars.

Features and Benefits

The Mitsubishi OEM Thermostat Housing 1305A043 offers several benefits for Evo 8 maintenance and restoration:

• Genuine Mitsubishi OEM thermostat housing
• Designed for the Evo 8 cooling-system configuration
• Suitable for the turbocharged 4G63 engine
• Factory-style thermostat mounting
• Correct OEM replacement for applicable applications
• Replaces earlier part number MN143307
• Useful for cooling-system repairs and restoration
• Suitable for 4G63 engine rebuilds
• Helps maintain original coolant-system component compatibility
• Ideal for street, restoration, and performance Evo builds

Firstly, the correct housing provides the proper mounting location for the thermostat. Secondly, an OEM replacement helps maintain the factory cooling-system configuration. Thirdly, replacing a damaged housing during thermostat service can help prevent problems associated with worn sealing surfaces or physical damage.

Thermostat Housing vs. Thermostat

It is important to understand that 1305A043 is the thermostat housing or thermostat case, not the thermostat itself. Mitsubishi lists the thermostat separately within the water pipe and thermostat assembly. For the Evo 8, Mitsubishi catalog information identifies MN143463 as a thermostat, while MD363254 is listed as the thermostat case gasket.

When ordering replacement cooling-system components, check whether you need the housing, thermostat, gasket, or complete assembly. These are separate components and should not automatically be assumed to be included with one another.

A proper installation should also include inspection of the thermostat gasket or sealing surface, coolant hoses, mounting bolts, and nearby water pipes.

Evo 8 vs Evo 9 Thermostat Housing

One of the most important details when purchasing this component is the distinction between the Evo 8 and Evo 9 thermostat housings.

Specialist Mitsubishi Evo parts sources identify 1305A043 as the Evo 8 thermostat housing and MD363250 as the Evo 9 housing.

Although both vehicles use the legendary 4G63 engine platform, the housing configurations should not simply be treated as interchangeable. If you are purchasing a replacement for an Evo 8, verify that 1305A043 matches your existing application before ordering.

Product Specifications

Brand: Mitsubishi
Part Number: 1305A043
Previous/Alternate Part Number: MN143307
Product Type: Thermostat Housing / Thermostat Case
OEM Status: Genuine Mitsubishi OEM
Vehicle: Mitsubishi Lancer Evolution VIII
Chassis: CT9A
Engine: 4G63 Turbo
Function: Houses the engine coolant thermostat
Application: 2003–2005 Evo 8
Related Gasket: MD363254
Category: Engine Cooling System → Thermostat & Housing → Thermostat Housings

Mitsubishi’s official parts store identifies 1305A043 as a new Case, Thermostat and lists MN143307 as the replaced part number.

When Should You Replace the Evo 8 Thermostat Housing?

A thermostat housing should be inspected whenever the thermostat is removed. Look for cracks, corrosion, damaged sealing surfaces, coolant residue, or other signs of deterioration.

Replacing the housing can be appropriate if there is visible damage or if the sealing surface is no longer suitable for maintaining a proper coolant seal. It can also be a practical choice during a major 4G63 rebuild or cooling-system refresh when older components are being replaced.

If you are experiencing a coolant leak near the thermostat area, do not automatically assume the housing is the source. The thermostat gasket, hoses, water outlet, fasteners, and surrounding components should also be inspected to identify the actual source of the leak.

Buy Mitsubishi OEM Thermostat Housing 1305A043 Online

If you are looking for a Mitsubishi OEM Thermostat Housing Evo 8 for sale, part number 1305A043 is an important reference for the applicable Evolution VIII cooling-system configuration. Confirm your model year, chassis, engine, and original part number before placing your order.

Whether you are replacing a damaged thermostat case, servicing your cooling system, rebuilding a 4G63 engine, or restoring an Evo 8, using the correct thermostat housing helps keep the original cooling-system components working together as designed.

At evomotorparts.com, you can shop online for Mitsubishi Evo parts, genuine OEM cooling-system components, 4G63 engine parts, thermostats, gaskets, water outlets, and other replacement parts for your Evolution project.

Frequently Asked Questions

What is Mitsubishi part number 1305A043?

1305A043 is a genuine Mitsubishi thermostat housing, also referred to as a thermostat case. Mitsubishi’s official parts catalog identifies it as CASE, THERMOSTAT and lists MN143307 as an earlier replacement part number.

Does 1305A043 fit the Evo 8?

Yes. Specialist Evo parts sources list 1305A043 for the 2003–2005 Mitsubishi Lancer Evolution VIII, including the CT9A 4G63 application.

Is 1305A043 the same as MN143307?

Mitsubishi’s official parts listing shows 1305A043 as replacing MN143307, making the newer part number an important reference when searching for the OEM thermostat housing.

Does the thermostat come with the housing?

The housing and thermostat are separate components in Mitsubishi’s parts catalog. For the Evo 8, MN143463 is listed as a thermostat, while 1305A043 is the thermostat case.

What gasket is used with the thermostat housing?

Mitsubishi catalog information lists MD363254 as the thermostat case gasket for the applicable cooling-system assembly.

Is the Evo 8 thermostat housing the same as the Evo 9?

Parts sources distinguish the two applications, identifying 1305A043 with the Evo 8 and MD363250 with the Evo 9. Verify the correct part number for your specific vehicle before ordering.

Can a damaged thermostat housing cause a coolant leak?

Yes. A damaged housing or sealing surface can contribute to a coolant leak, although the gasket, thermostat, hoses, and nearby coolant connections should also be inspected to determine the actual source.

Is this housing suitable for a 4G63 rebuild?

The 1305A043 housing is associated with the Evo 8 4G63 cooling-system application. It can be useful during an engine rebuild or cooling-system restoration, provided the specific vehicle configuration is verified. Maintain the factory-style cooling system on your Mitsubishi Lancer Evolution VIII with the genuine Mitsubishi OEM Thermostat Housing 1305A043, and shop evomotorparts.com for quality Mitsubishi Evo parts and 4G63 cooling-system components for your next repair, maintenance, restoration, or engine-building project.

Buy Mitsubishi OEM Thermostat Housing Evo 8 1305A043 for the CT9A 4G63 cooling system, Shop the genuine Evo 8 thermostat housing online.