Heater Valve Repair Kit – Mercedes W124 E300 E420 E320 CDI | Seals Only | P/N 0018303984

Seal kit for Mercedes W124 heater control valves — replaces internal O-rings and seals to restore full valve function and stop coolant leaks.

Fits OEM #0018303984.

When to Inspect This Part

• HVAC system blows only hot air
• HVAC system blows only cold air
• cabin temperature cannot be adjusted correctly
• different air temperature from the left and right vents
• weak cabin heat
• fluid or coolant leakage

What's Included

• All internal seals and O-rings — seals only

Important Limitations

This repair is suitable when the original valve housing and electrical solenoids remain functional. A cracked housing or failed solenoid may require a complete valve assembly.

OEM Part Numbers and Vehicle Fitment

Additional confirmed fitment

• BMW W124 E300 E420 E320CDI

Part Number / PN

0018303984, 0018302084, 0008307284, 653590728818

Important Fitment Check

Before ordering, compare the part design, dimensions, connectors, and every available OEM/P/N marking with the part installed on the vehicle. Matching OEM/P/N 0018303984 is the primary fitment check.

FAQ

How do I confirm fitment for this Heater Valve Repair Kit?

Compare the exact OEM/P/N and physical design with the installed part. The primary reference is 0018303984. Do not select the part by vehicle model alone.

What symptoms may indicate a problem with this Heater Valve Repair Kit?

Confirmed symptoms include HVAC system blows only hot air, HVAC system blows only cold air, cabin temperature cannot be adjusted correctly, different air temperature from the left and right vents. Diagnose the original assembly before ordering so another fault is not mistaken for this part.

What is included with this Heater Valve Repair Kit?

The confirmed kit contents are: All internal seals and O-rings — seals only.

Does this listing include the complete surrounding assembly?

This repair is suitable when the original valve housing and electrical solenoids remain functional. A cracked housing or failed solenoid may require a complete valve assembly.

What should be checked before installation?

Check the OEM/P/N, dimensions, connectors, orientation, and condition of the mating components. Installation should follow the correct service procedure for the specific vehicle and assembly.

• Mercedes

Returns and exchanges

Request a change-of-mind return within 14 calendar days of delivery, then send the goods within 14 calendar days of notifying us. Our voluntary return option applies to unused, uninstalled, complete goods in their original condition and packaging. Exchanges are subject to availability and agreement.

The customer pays change-of-mind return shipping. No restocking fee applies. Refunds and original delivery charges are handled under our Refund & Return Policy and applicable law.

Faulty, damaged or incorrect goods

Email contact-us@klifex.net with your order details and a description of the problem. These claims are separate from change-of-mind returns. Where we are responsible, we bear the required remedy and return costs. Installation alone does not remove mandatory defect rights.

Your legal rights

Applicable statutory rights take precedence, including EU/EEA and UK withdrawal rights and legal guarantees. Necessary inspection does not remove a statutory withdrawal right; deductions for excessive handling must reflect an actual, evidenced loss of value.

Contact us for the correct return address before shipping. Our legal address is not a return address.

Read the full Refund & Return Policy