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.
Read All
Orders ship within 1–2 business days.
Standard delivery:
- USA: Some items ship from our US warehouse and arrive within 3 business days.
- USA-EU: 10–21 business days
- Worldwide: 14–30 business days
Shipping cost is shown at checkout.
Can I exchange or return an item?
Yes, you can exchange or return an item within 14 days of purchase. This right is guaranteed to you by the Law on the Protection of Consumer Rights
To use this feature, please make sure that:
- the product was not in use and has no traces of use: scratches, chips, abrasions, etc.
- the goods are fully completed and the integrity of the packaging is not violated
- retained all labels and factory markings