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BMW E30 M3 HPS Silicone Radiator Hose Replacement Kit DIY Installation Guide

Vehicle Application: 1988-1991 BMW E30 M3
Product Type: HPS Performance Silicone Radiator Hose Kit
HPS Part Numbers:

Tips: The installation was straightforward, and there was ample space to work in the engine bay.

Estimated install time: 1 hour

Tools needed:
- Needle-nosed pliers
- Flat-blade screwdriver
- Drain pan
- Funnel

The HPS coolant replacement hose kit not only replaces your coolant hoses to the radiator but also replaces your heater hoses as well. This kit also includes new clamps so you don't have to reuse the old ones.



The kit is available in three colors - black, blue and red. For this project we decided to go with the black silicone hose kit.



Before anything, make sure the car has completely cooled down to avoid any burns or injuries. Jack up the car and secure it with jack stands, or use roll up ramps. Please be extra cautious when lifting your vehicle.



The under tray is held on by 6 bolts. There are three on each side, and the tray slides off. There are no bolts on the front of  the tray.



Once the tray is off you can access the drain plug and the lower radiator hose. Begin draining the coolant. You can remove the radiator overflow cap to let the coolant drain faster.



In this picture you can see most of the hoses that you will be replacing. Not shown are the two heater hoses, lower radiator hose, the Y junction hose, the step hose and the reducer which are located on the other side of the engine.



Most of the factory hoses are held on by worm drive clamps and can be removed by using a flat head (blade) screwdriver.  When you remove the hoses connecting to the thermostat housing, make sure you have the drain pan underneath because there will be more coolant pouring out from the engine block side that did not drain from the radiator.



Once you finish replacing all of the coolant hoses, refill the coolant system and check for leaks. Start the engine and turn the heater to the hottest temperature (to open the thermostat), and set the fan to the lowest setting. Let the car idle  and check for leaks. Once the car has reached operating temperature, turn the engine off and let the car cool down. Top off the coolant system as needed and put the coolant cap back on.



Drive the car around and re-check the coolant level once the car has cooled down.

1988-1991 BMW E30 M3 S14 Engine HPS Silicone Radiator Hose Kit is available in Black, Blue and Red.

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