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Coolant and Radiator Hose Replacement
 
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Pelican Technical Article:

Coolant and Radiator Hose Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$15 to $250

Talent:

**

Tools:

Pliers, flathead screwdriver, large bucket

Applicable Models:

Mercedes-Benz W124 (1986-95)

Parts Required:

New hoses

Hot Tip:

Get a really big bucket

Performance Gain:

Proper cooling

Complementary Modification:

Radiator Flush

The cooling system on your vehicle is one of the most important and yet neglected parts of the car. Nothing can leave you stranded faster than not replacing a rubber hose before it goes bad. I recommend inspecting your hoses and couplings every two years or so. As they age, they have a tendency to get hard and brittle. When you gently squeeze a hose, it should be relatively soft and easy to indent with your hand. It shouldn't feel like it is brittle or crunching when you squeeze it. It should spring back to its original shape pretty quickly after being compressed. If it feels hard, then it might be time to replace it. If there is a bulge in the hose, or any type of crack in the surface of the hose, then you should replace it as well. Also check for leaks around where the hoses create their connections.

A couple of safety precautions/instructions you may want to observe before beginning:

Allow the cooling system to cool down to a coolant temperature of less than 90°C. Open the cap of the cooling system slowly. Turn a conventional coolant cap as far as the first detent and turn a screwed coolant cap approximately one-half turn and release the pressure. Wear protective gloves, protective clothing and eye protection. NEVER pour coolant into beverage bottles, cups, etc... Someone might accidentally pick that cup up and start to drink. Coolant is hazardous and must be collected and disposed of according to your local regulations. NEVER pour coolant down a sewer. You will only need to drain the coolant to the lowest point of the hose you are replacing.

If the coolant in the car is new there is no reason to replace it as long as you drain it into a clean container. Coolant is expensive and not too great for the environment, so if the coolant in your car is good, try and save it to reuse.

To change all of the hoses you will need to safely jack up and support the car, remove the engine tray and the air filter box. Please refer to these articles should you need guidance in safely performing these projects.

There are four basic areas that involve coolant and hoses.
Figure 1

There are four basic areas that involve coolant and hoses. They are the coolant reservoir (red arrow), the heater valves (green arrow), the radiator (yellow arrow) and the water pump (purple arrow).

Reservoir and Radiator- The coolant overflow hoses run from the top of the overflow reservoir (green arrow) to the top of the radiator (red arrow).
Figure 2

Reservoir and Radiator- The coolant overflow hoses run from the top of the overflow reservoir (green arrow) to the top of the radiator (red arrow).

Reservoir and Radiator- Use a flathead screwdriver and remove the hose (red arrow) from the plastic elbow (yellow arrow) on the top of the radiator.
Figure 3

Reservoir and Radiator- Use a flathead screwdriver and remove the hose (red arrow) from the plastic elbow (yellow arrow) on the top of the radiator. The plastic elbow is very fragile but can also be replaced if broken by gently separating the clips and removing it straight up from the radiator.

Reservoir and Radiator- Use a flathead screwdriver and remove the clamp and hose from the reservoir (red arrow).
Figure 4

Reservoir and Radiator- Use a flathead screwdriver and remove the clamp and hose from the reservoir (red arrow).

Reservoir and Radiator- The coolant reservoir to radiator supply hose is located on the bottom of the reservoir.
Figure 5

Reservoir and Radiator- The coolant reservoir to radiator supply hose is located on the bottom of the reservoir. You will need to remove the air filter and box to get access to this hose. Please see our article on air filter replacement for further assistance. Use a flathead screwdriver and remove the clamp and hose (red arrow) from the bottom of the reservoir (green arrow).

Reservoir and Radiator- The reservoir supply hose connects to the lower right side of the radiator with a standard hose clamp (red arrow).
Figure 6

Reservoir and Radiator- The reservoir supply hose connects to the lower right side of the radiator with a standard hose clamp (red arrow).

Water Pump and Radiator- At the front left section of the radiator are the coolant reservoir overflow tube (red arrow), the radiator hose to thermostat (yellow arrows) and the radiator to water pump hose (green arrows).
Figure 7

Water Pump and Radiator- At the front left section of the radiator are the coolant reservoir overflow tube (red arrow), the radiator hose to thermostat (yellow arrows) and the radiator to water pump hose (green arrows).

Water Pump and Radiator- Use a flathead screwdriver and remove the clamp and hose from the radiator (red arrow) to the thermostat (yellow arrow).
Figure 8

Water Pump and Radiator- Use a flathead screwdriver and remove the clamp and hose from the radiator (red arrow) to the thermostat (yellow arrow).

Water Pump and Radiator- With the upper hose removed use a flathead screwdriver and remove the clamp and hose from the middle left side of the radiator (red arrow) to the coolant pump (yellow arrow).
Figure 9

Water Pump and Radiator- With the upper hose removed use a flathead screwdriver and remove the clamp and hose from the middle left side of the radiator (red arrow) to the coolant pump (yellow arrow).

Water Pump and Radiator- There is a hose that connects the engine block to the coolant pump.
Figure 10

Water Pump and Radiator- There is a hose that connects the engine block to the coolant pump. Use a flathead screwdriver and remove the clamps and hose.

Heater Valves- The heater valves line starts as a metal line that runs across the front of the engine from the coolant pump (red arrow) to the rubber hose on the right side (green arrow).
Figure 11

Heater Valves- The heater valves line starts as a metal line that runs across the front of the engine from the coolant pump (red arrow) to the rubber hose on the right side (green arrow).

Heater Valves- There is a rubber line that connects the metal line from the coolant pump to the metal line along the frame.
Figure 12

Heater Valves- There is a rubber line that connects the metal line from the coolant pump to the metal line along the frame. Replace this hose by using a flathead screwdriver and removing the clamp and hose (red arrows). There is a small hose that connects the hard line to the heater valves (yellow arrows); this is removed with a flathead screwdriver as well. The green arrows indicate the reservoir to radiator supply line.

Heater Valves- The heater valve (yellow arrow) has two hoses leading to the heater core.
Figure 13

Heater Valves- The heater valve (yellow arrow) has two hoses leading to the heater core. Both hoses are replaced by removing the clamps (red arrows).

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Comments and Suggestions:
Bolton Comments: How does one replace the very short hose between the head and the water pump? Tolerance is very tight.
May 29, 2016
  Followup from the Pelican Staff: Best bet is to do so with the water pump removed. - Nick at Pelican Parts  
matt Comments: please identify this part it is at the back of the motor looks like a tree for heat and coolant
August 22, 2015
  Followup from the Pelican Staff: Photo quality is poor, hard to tell. Looks like a hose.

Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
monica Comments: This hose is leaking and coolant is going everywhere. I just don't know what this is or the part number. This is the pic
June 29, 2015
  Followup from the Pelican Staff: Looks like the upper radiator hose.

Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 

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