What Comes in the Kit?
The MMHOSE-3KGT-91BK is a primary radiator hose kit intended to replace the molded upper and lower radiator hoses.
The package does not replace every cooling hose found on the 3000GT or Stealth. Smaller bypass, throttle-body, heater, turbocharger and overflow hoses are separate components.
Clamp inclusion is not consistently identified across current retailer listings. Confirm the package contents with the seller and obtain correctly sized clamps if they are not included.
Reinforced Silicone Construction
Mishimoto constructs the hoses using high-grade silicone combined with heat-resistant embedded fibers. This reinforced design helps the hoses retain their shape as coolant temperature and system pressure fluctuate.
Compared with deteriorated factory rubber hoses, silicone provides improved resistance to:
- High coolant temperatures
- Cooling-system pressure
- Repeated heat cycling
- Cracking and hardening
- Swelling caused by age
- Hose deformation
- Ozone and environmental exposure
The black finish gives the engine compartment a factory-inspired appearance. That is particularly useful on a 3000GT VR-4, where opening the hood already reveals enough plumbing to make a municipal engineer nervous.
Why Replace Old 3000GT Radiator Hoses?
The newest original 3000GT hoses are now decades old. Even a low-mileage car can have deteriorated hoses because rubber ages through time, temperature cycling and chemical exposure—not just mileage.
Inspect the hoses for:
- Cracks near the connections
- Bulges or swollen areas
- Soft or spongy sections
- Hardened rubber
- Coolant residue around clamps
- Internal hose separation
- Abrasion against nearby components
- Coolant odor after driving
- Unexplained coolant loss
- Overheating under load
- Lower-hose collapse
A pressure-dependent leak may only appear when the engine is hot. Our guide on how to find a coolant leak explains how to inspect hoses, clamps, the radiator, water pump and other common leak sources.
Suitable for Turbo and Non-Turbo Models
Mishimoto lists this hose kit for naturally aspirated and twin-turbo configurations. However, replacing the radiator hoses does not increase cooling capacity or lower coolant temperature by itself.
Reliable operation still depends on:
- Correct coolant level
- Proper coolant mixture
- Functional thermostat
- Healthy water pump
- Unrestricted radiator
- Working cooling fans
- Correct radiator cap
- Proper system bleeding
- Adequate airflow
This is especially important on VR-4 and Stealth R/T Turbo models, where boost increases heat output and the engine compartment has roughly the same amount of spare room as an airline economy seat.
Installation Notes
Never remove the radiator cap or disconnect a cooling-system hose while the engine is hot. Pressurized coolant can cause serious burns.
A typical installation includes:
- Allowing the engine to cool completely.
- Disconnecting the negative battery terminal when required.
- Draining the coolant into an approved container.
- Photographing the factory hose routing.
- Removing the existing clamps and hoses.
- Cleaning residue from each connection.
- Comparing the new hoses with the originals.
- Installing the hoses without twisting or kinking them.
- Positioning properly sized clamps behind each fitting bead.
- Refilling with the correct coolant mixture.
- Bleeding trapped air from the system.
- Checking the connections after reaching operating temperature.
On twin-turbo models, verify clearance around the intake piping, fans, belts and other tightly packaged components before completing installation.
If the existing coolant is contaminated or its history is unknown, follow our guide on how to flush a car cooling system before refilling it.
Will These Hoses Fix Overheating?
The kit can correct overheating caused by a leaking, internally restricted or collapsing radiator hose. It cannot repair overheating caused by:
- Low coolant
- Trapped air
- Failed thermostat
- Weak water pump
- Damaged radiator
- Inoperative cooling fans
- Incorrect fan controls
- Failed pressure cap
- Combustion leakage
Our guide comparing a bad thermostat versus a bad water pump can help determine whether an overheating problem involves temperature control or coolant circulation.
Frequently Asked Questions
What cars does MMHOSE-3KGT-91BK fit?
It fits 1991–1999 Mitsubishi 3000GT models and 1991–1996 Dodge Stealth models with the 3.0L 6G72 V6.
Does it fit the 3000GT VR-4?
Yes. Mishimoto lists the kit for turbocharged and naturally aspirated applications, including the twin-turbo 3000GT VR-4.
Does it fit the Dodge Stealth R/T Turbo?
Yes. The kit covers the 1991–1996 Stealth R/T Turbo application.
Does it fit naturally aspirated models?
Yes. Mishimoto lists both turbo and non-turbo compatibility. This includes applicable SOHC and DOHC naturally aspirated models.
How many hoses are included?
The kit contains the primary upper and lower radiator hoses.
Does it replace every coolant hose?
No. It does not replace all heater, bypass, throttle-body or turbocharger coolant hoses.
Are clamps included?
Retailer listings are inconsistent regarding clamps. Confirm the package contents before ordering.
What is the maximum temperature rating?
The hoses are rated for temperatures up to 330°F or approximately 165°C.
Will it fit an aftermarket aluminum radiator?
It may fit if the aftermarket radiator retains factory-size inlet and outlet connections in the original locations. Verify both diameters and hose routing before installation.
Official specifications are available from the Mishimoto MMHOSE-3KGT-91BK product page.
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